High-yield overview
Preserve Sensation and Length | Functional Priorities | Prosthetic Integration | Targeted Muscle Reinnervation
SensationPriority over length in upper limb
TraumaMost common indication (80%)
TMRTargeted muscle reinnervation improves function
5:1Lower limb to upper limb amputation ratio
UPPER LIMB AMPUTATION LEVELS
Digital/Ray
PatternFinger or ray amputation
TreatmentPreserve length, tension-free closure
Transcarpal/Wrist
PatternWrist disarticulation
TreatmentPreserves pronation-supination
Transradial
PatternBelow-elbow amputation
TreatmentPreserve elbow - critical for function
Transhumeral
PatternAbove-elbow amputation
TreatmentPreserve length for prosthetic control
Forequarter
PatternInterscapulothoracic amputation
TreatmentOncological or severe trauma
Critical Must-Knows
- Functional priority in upper limb: Sensation greater than motion greater than length (opposite to lower limb)
- Preserve elbow joint whenever possible - essential for prosthetic function and ADLs
- Replantation vs amputation: Consider indications including thumb, multiple digits, child, clean sharp amputation
- TMR (Targeted Muscle Reinnervation): Improves myoelectric prosthetic control and reduces neuroma pain
- Body-powered vs myoelectric prostheses: Different advantages - body-powered provides sensory feedback
Clinical Pearls
- "Upper limb amputees use prostheses less than lower limb amputees - functional adaptation common
- "Replant thumb at all costs - worth the entire hand functionally
- "Transradial amputation maintains pronation-supination if distal radioulnar joint preserved
- "Phantom limb pain affects up to 80% of upper limb amputees - early intervention essential
Clinical Imaging
Imaging Gallery
Critical Upper Limb Amputation Exam Points
Sensation Over Length
Upper limb priorities differ from lower limb. The sensate hand is critical for function - a shorter stump with preserved sensation may be more functional than a longer insensate stump. Always preserve sensate tissue where possible. This contrasts with lower limb where length for weight-bearing and prosthetic fitting is paramount.
Replantation Decision
Know the replantation indications: Thumb (most important single digit), multiple digits, hand through wrist, pediatric (any level), clean sharp amputation. Contraindications: Multi-level injury, severe crush/avulsion, prolonged warm ischaemia (greater than 6 hours for digits), life-threatening injuries, severe comorbidities.
Prosthetic Considerations
Body-powered prostheses provide proprioceptive feedback and are more durable. Myoelectric prostheses offer cosmesis and grip strength but lack sensory feedback. Many upper limb amputees reject prostheses and adapt functionally. Elbow preservation is essential for any prosthetic control.
Targeted Muscle Reinnervation
TMR (Targeted Muscle Reinnervation) is an emerging technique where transected nerves are transferred to nearby muscle targets. This provides intuitive myoelectric control, reduces phantom pain, and prevents neuroma formation. Know this as a contemporary technique for transradial and transhumeral levels.
Upper Limb Amputation Level Selection Guide
| Level | Key Considerations | Functional Outcome | Prosthetic Options |
|---|---|---|---|
| Finger amputation | Preserve length, preserve insertion of FDS/FDP | Good function, cosmesis concern | Passive cosmetic, rarely active |
| Ray amputation | Improves grip for adjacent digits, cosmesis | Narrower hand, may improve function | Cosmetic finger prosthesis |
| Wrist disarticulation | Preserves pronation-supination, long lever arm | Excellent residual function | Body-powered or myoelectric |
| Transradial (BEA) | Preserve elbow, minimum 5cm for pronation | Good prosthetic control with elbow intact | Myoelectric with multiple grip patterns |
| Elbow disarticulation | Long lever arm, no bone cut | Bulky prosthetic elbow, limited cosmesis | External locking elbow |
| Transhumeral (AEA) | Preserve length for prosthetic suspension | Major functional loss, reduced prosthetic use | Myoelectric with TMR, body-powered |
| Shoulder/Forequarter | Oncological indication most common | Very limited prosthetic use | Cosmetic shoulder cap |
Mnemonic
SENSEUpper Limb Amputation Priorities
| S | Sensation first Preserve sensate tissue - critical for hand function |
| E | Elbow preservation Preserves 50% of arm function - essential for prosthetic control |
| N | Nerve management TMR or traction neurectomy to prevent painful neuromas |
| S | Stable coverage Durable soft tissue envelope for prosthetic wear |
| E | Early prosthetic fitting Improves acceptance and long-term use |
| S | Sensation first Preserve sensate tissue - critical for hand function | S | Stable coverage Durable soft tissue envelope for prosthetic wear |
| E | Elbow preservation Preserves 50% of arm function - essential for prosthetic control | E | Early prosthetic fitting Improves acceptance and long-term use |
| N | Nerve management TMR or traction neurectomy to prevent painful neuromas |
Hook:Upper limb makes SENSE - Sensation and Elbow preservation are the priorities
Mnemonic
THUMB PLUSReplantation Indications
| T | Thumb Single most important digit - replant at all costs |
| H | Hand/wrist level Proximal level with good outcomes |
| U | Uninjured zone Clean sharp amputation, single level injury |
| M | Multiple digits Loss of multiple digits warrants attempt |
| B | Bilateral hand loss Restore at least one hand |
| P | Pediatric Children have excellent regeneration potential |
| L | Little warm ischaemia Less than 6 hours for digits, less than 12 hours for major limb |
| U | Upper limb Upper limb replantation has better outcomes than lower |
| S | Sharp mechanism Clean cut better than crush or avulsion |
| T | Thumb Single most important digit - replant at all costs | M | Multiple digits Loss of multiple digits warrants attempt | L | Little warm ischaemia Less than 6 hours for digits, less than 12 hours for major limb |
| H | Hand/wrist level Proximal level with good outcomes | B | Bilateral hand loss Restore at least one hand | U | Upper limb Upper limb replantation has better outcomes than lower |
| U | Uninjured zone Clean sharp amputation, single level injury | P | Pediatric Children have excellent regeneration potential | S | Sharp mechanism Clean cut better than crush or avulsion |
Hook:THUMB PLUS all its fingers equals replantation success
Mnemonic
GRASPProsthetic Selection Factors
| G | Grip patterns Myoelectric offers multiple grip options |
| R | Residual limb length Affects socket fit and control sites |
| A | Activity level Body-powered for heavy work, myoelectric for fine tasks |
| S | Sensory feedback Body-powered provides proprioceptive feedback |
| P | Patient goals Cosmesis, function, or both - patient preference key |
| G | Grip patterns Myoelectric offers multiple grip options | S | Sensory feedback Body-powered provides proprioceptive feedback |
| R | Residual limb length Affects socket fit and control sites | P | Patient goals Cosmesis, function, or both - patient preference key |
| A | Activity level Body-powered for heavy work, myoelectric for fine tasks |
Hook:Help patients GRASP their prosthetic options - matching function to need
Overview and Epidemiology
Upper limb amputation is the surgical removal of part or all of the upper extremity. Unlike lower limb amputation where weight-bearing function is paramount, upper limb amputation surgery must prioritize preservation of sensation and fine motor function to maximize hand utility.
Epidemiology:
- Upper limb amputations are approximately 5 times less common than lower limb
- Trauma is the most common indication (80%) - industrial accidents, motor vehicle trauma
- Males predominate (3:1 ratio) due to occupational exposure
- Mean age is younger than lower limb amputees (occupational injury)
- Finger and partial hand amputations are most common
Upper vs Lower Limb Amputation Philosophy
Upper limb amputation differs fundamentally from lower limb. In the lower limb, the goal is weight-bearing and locomotion - length and prosthetic fitting are priorities. In the upper limb, sensation and fine motor control are essential for hand function. A shorter sensate stump may be more functional than a longer insensate one. Many upper limb amputees adapt without prostheses.
Indications:
Trauma (80%)
- Industrial accidents: Crush, avulsion, saw injuries
- Motor vehicle trauma: Mangled extremity
- Burns: Electrical, thermal with vascular compromise
- Frostbite: Severe cold injury with gangrene
- Failed replantation or reconstruction
Non-Traumatic Causes
- Malignancy: Primary bone/soft tissue sarcoma
- Infection: Gas gangrene, necrotizing fasciitis, refractory osteomyelitis
- Vascular: Rare in upper limb (brachial artery occlusion, Buerger's disease)
- Congenital: Constriction band syndrome, amniotic band syndrome
Contraindications to Replantation (Favour Amputation):
- Multi-level or avulsion injury (poor prognosis)
- Severe crush injury with tissue destruction
- Warm ischaemia time greater than 6 hours for digits (12 hours if cooled)
- Life-threatening associated injuries requiring resuscitation
- Severe medical comorbidities precluding prolonged surgery
- Self-inflicted injuries (relative - psychiatric assessment needed)
Pathophysiology and Functional Considerations
Functional Anatomy Considerations
Understanding the functional requirements at each level is essential for amputation planning in the upper limb.
Functional Loss by Amputation Level
| Level | Function Lost | Function Preserved | Prosthetic Potential |
|---|---|---|---|
| Finger (distal to MCP) | Fine pinch, sensation at fingertip | Power grip, adjacent finger function | Limited - cosmetic mainly |
| Hand (transmetacarpal) | All grip patterns, opposition | Wrist motion, pronation-supination | Partial hand prosthesis |
| Wrist disarticulation | Grip, wrist motion | Full pronation-supination (50 degrees each) | Good terminal device control |
| Transradial | Grip, wrist, partial forearm rotation | Elbow flexion-extension | Excellent myoelectric control |
| Transhumeral | All below-elbow function | Shoulder motion only | Limited - major functional loss |
| Shoulder disarticulation | All arm function | Trunk and scapular motion | Very limited prosthetic use |
Nerve Handling and Neuroma Prevention
Neuroma Formation:
- Inevitable after nerve transection - regenerating axons form disorganized mass
- Painful neuroma develops when nerve end is in mobile or pressure-bearing area
- Upper limb neuromas are particularly problematic due to constant use
- Prevention is key - proper nerve management at initial surgery
Targeted Muscle Reinnervation (TMR):
Targeted Muscle Reinnervation
TMR involves transferring transected nerves to nearby muscle motor points. The muscle serves as a biological amplifier - when the patient thinks of moving their missing hand, the reinnervated muscle contracts, providing strong EMG signals for myoelectric prosthetic control. TMR also prevents neuroma formation and reduces phantom pain by providing the transected nerve a target.
TMR Nerve Transfers by Level:
- Transradial: Median and ulnar nerves to remaining forearm muscle motor points
- Transhumeral: Median to short head biceps, ulnar to brachialis, radial to lateral triceps
- Shoulder: Musculocutaneous to clavicular pectoralis major, median/ulnar to sternal pectoralis
Phantom Limb Phenomena
Phantom Limb Sensation:
- Nearly universal after upper limb amputation
- Non-painful awareness of missing limb
- Typically diminishes over time
Phantom Limb Pain (PLP):
- Affects 50-80% of upper limb amputees
- Character: Burning, cramping, shooting, electric
- Risk factors: Pre-amputation pain, traumatic mechanism, anxiety/depression
- Prevention: Perioperative nerve blocks, TMR at initial surgery
Phantom Pain Prevention
Early intervention is key for phantom limb pain. Perioperative regional anaesthesia (brachial plexus block, epidural) may reduce incidence. TMR at primary amputation reduces both neuroma pain and phantom pain. Mirror therapy should be initiated early in rehabilitation.
Clinical Presentation and Assessment
Indications by Level
Finger and Ray Amputation
Indications:
- Irreparable crush or avulsion injury to digit
- Failed replantation
- Severe infection (septic arthritis, osteomyelitis)
- Tumour requiring local excision
- Painful non-functional digit (neuroma, cold intolerance)
Assessment:
- Vascularity of adjacent tissue
- Tendon and nerve integrity
- Level of injury (through bone vs joint)
- Replantation candidacy (thumb prioritized)
Functional Considerations:
- Thumb: Most important digit - 50% of hand function. Replant at all costs
- Index finger: Precision pinch, pointing. Loss well compensated by long finger
- Long finger: Central pillar of grip. Loss affects both power and precision
- Ring finger: Power grip contribution. Ray amputation may improve function
- Little finger: Ulnar border, power grip. Preserve for cupping function
Replantation Decision-Making
Replantation vs Amputation Decision Factors
| Factor | Favours Replantation | Favours Amputation |
|---|---|---|
| Mechanism of injury | Clean, sharp cut (guillotine) | Crush, avulsion, multi-level |
| Ischaemia time | Less than 6 hours (digit), less than 12 hours (major limb) | Prolonged warm ischaemia |
| Level | Thumb, multiple digits, proximal (wrist/forearm) | Single digit (index, long, ring) |
| Patient age | Pediatric (excellent regeneration), young adult | Elderly with comorbidities |
| Patient factors | Non-smoker, compliant, motivated | Smoker, non-compliant, unrealistic expectations |
| Associated injuries | Isolated limb injury, stable patient | Polytrauma, life-threatening injuries |
Investigations
Investigation Protocol for Upper Limb Amputation Planning
ImagingPlain Radiographs
Essential for all cases:
- AP and lateral of affected limb segment
- Assess bone level, fracture pattern, foreign bodies
- For trauma: Full trauma series if indicated
- Chest radiograph if oncological (metastatic workup)
VascularVascular Assessment
When vascular injury suspected:
- Hand-held Doppler assessment of radial, ulnar, digital arteries
- Allen test for palmar arch competency
- CT angiography if revascularization being considered
- Warm ischaemia time documentation critical
AdvancedAdvanced Imaging
Selected cases:
- MRI: Tumour staging, soft tissue extent
- CT: Bone detail, fracture pattern, foreign bodies
- PET-CT: Oncological staging if sarcoma suspected
LaboratoryBlood Tests
Preoperative baseline:
- Full blood count, coagulation studies
- Group and hold (cross-match if major amputation)
- Urea, electrolytes, glucose
- CRP if infection suspected
- Muscle enzymes if crush injury (rhabdomyolysis risk)
Replantation Workup
For potential replantation, investigations are time-critical. Obtain X-rays of both amputated part and stump. Document exact ischaemia time. Cool the amputated part correctly (wrapped in saline-moistened gauze, in plastic bag, on ice - not directly on ice or in water). Activate replantation team while investigations proceed.
Management Principles
Level Selection Principles
Goals in Upper Limb Amputation:
- Preserve sensation wherever possible
- Preserve elbow joint (critical for function)
- Preserve length for prosthetic fitting
- Ensure durable soft tissue coverage
- Prevent neuroma formation (TMR when possible)
- Optimize for prosthetic or functional adaptation
Upper Limb Amputation Levels - Detailed
| Level | Length Requirements | Key Structures to Preserve | Prosthetic Implications |
|---|---|---|---|
| Finger | Maximum length through bone | Preserve FDS/FDP insertions if possible | Cosmetic prosthesis only |
| Ray amputation | Through metacarpal base | Adjacent finger tendons and nerves | Improves grip, cosmetic option |
| Wrist disarticulation | Through radiocarpal joint | Distal radioulnar joint (pronation-supination) | Excellent control, bulbous end |
| Transradial | Minimum 5cm from olecranon | Elbow joint, biceps/brachialis insertions | Ideal for myoelectric, TMR possible |
| Elbow disarticulation | Through joint, preserve condyles | Humeral length, epicondyles for suspension | External elbow lock, bulky |
| Transhumeral | Minimum 10cm from acromion | Deltoid insertion if possible | TMR improves control significantly |
| Shoulder disarticulation | At glenohumeral joint | Scapula, clavicle for cosmetic cap | Limited prosthetic use |
Surgical Management
Digital Amputation Technique
Indications:
- Irreparable trauma to digit
- Severe infection (septic arthritis, osteomyelitis)
- Non-viable replant
- Tumour requiring excision
Level Selection:
- Preserve maximum length
- Through bone preferred to through joint (cosmesis)
- Preserve FDP/FDS insertions when possible
Digital Amputation Steps
Step 1Marking and Incision
Fish-mouth or lateral incisions:
Create volar and dorsal flaps of equal length, or lateral flaps for side-to-side closure. Volar flap slightly longer provides better coverage.
Step 2Soft Tissue Dissection
Identify and protect structures:
Divide flexor and extensor tendons proximal to skin level. Identify digital nerves and arteries.
Step 3Nerve and Vessel Management
Ligate vessels, handle nerves:
Ligate or cauterize digital arteries. Apply gentle traction to digital nerves, transect sharply, allow retraction.
Step 4Bone Division
Divide bone smoothly:
Use bone cutter or saw. Rongueur to smooth edges. Bone level proximal to skin level for tension-free closure.
Step 5Closure
Tension-free skin closure:
Close volar to dorsal skin with interrupted nylon. Bulky dressing with aluminium finger splint protection.
Technical Pearls:
- Thumb: Preserve maximum length - every millimeter counts
- Index ray amputation: Improves cosmesis and grip width
- Ring ray amputation: Narrows hand, may improve power grip
- Volar flap: More durable than dorsal skin for tip coverage
Prosthetic Considerations
Prosthetic Options by Level
Prosthetic Options for Upper Limb Amputation
| Level | Prosthetic Type | Terminal Device | Control Mechanism |
|---|---|---|---|
| Finger/Partial hand | Passive cosmetic silicone | Cosmetic fingers | None - passive |
| Wrist disarticulation | Body-powered or myoelectric | Hook or hand | Cable or EMG |
| Transradial | Myoelectric multi-articulating hand | i-Limb, bebionic, TASKA | 2-site EMG or pattern recognition |
| Elbow disarticulation | Body-powered or hybrid | Hook or hand with external elbow | Cable for elbow, EMG for TD |
| Transhumeral | Myoelectric with TMR | Multi-articulating hand and elbow | Pattern recognition optimal |
| Shoulder | Cosmetic cap | None functional | Cosmetic restoration only |
Body-Powered vs Myoelectric Prostheses
Body-Powered Prostheses
Advantages:
- Provides proprioceptive feedback through cable
- More durable, reliable
- Lower cost and maintenance
- Works in wet and dirty environments
- Lighter weight
Disadvantages:
- Limited grip strength
- Less cosmetic
- Requires harness (uncomfortable for some)
- Fatiguing with prolonged use
Myoelectric Prostheses
Advantages:
- Better cosmesis
- Higher grip strength
- Multiple grip patterns (modern hands)
- No harness required
- Less physical effort for operation
Disadvantages:
- No sensory feedback
- Battery dependent
- Cannot use in wet environments
- Higher cost and maintenance
- Heavier
Prosthetic Rejection
Upper limb amputees reject prostheses more often than lower limb amputees (30-50% rejection rate). Many adapt functionally using their residual limb and contralateral hand. Body-powered prostheses are rejected less often than myoelectric due to feedback and reliability. Early prosthetic fitting improves long-term use. Patient goals and occupation should guide prosthetic selection.
Complications
Wound-Related Complications
Wound Complications
| Complication | Incidence | Risk Factors | Management |
|---|---|---|---|
| Wound infection | 5-10% | Diabetes, contamination, crush injury | Antibiotics, debridement, revision if needed |
| Wound dehiscence | 5% | Tension, poor vascularity, malnutrition | VAC therapy, revision, skin graft if needed |
| Flap necrosis | Variable | Crush injury, arterial disease, tension | Debridement, revision to higher level |
| Haematoma | 5% | Anticoagulation, inadequate hemostasis | Aspiration or evacuation |
Prevention:
- Tension-free closure
- Adequate hemostasis
- Avoid closure over bone prominences
- Proper flap design
Evidence Base and Key Studies
TMR Treats Neuroma and Phantom Pain in Major Amputees (Landmark RCT)
Dumanian GA, Potter BK, Mioton LM, et al. • Ann Surg (2019)
Key Findings:
- First randomised surgical trial for post-amputation pain - 28 major limb amputees randomised to TMR versus standard neuroma excision with burying in muscle
- In longitudinal mixed-model analysis, reduction in phantom limb pain was significantly greater with TMR (between-group difference 3.5 on the 0-10 NRS, P=0.03)
- Residual (neuroma) limb pain trended in favour of TMR (difference 1.9, P=0.10 to 0.15)
- Results continued to favour TMR at longest follow-up including crossover patients
- Multicentre design (Northwestern and Walter Reed)
Clinical Implication: TMR is the first surgical technique shown in an RCT to reduce post-amputation phantom and residual limb pain versus conventional neurectomy. Strongly supports performing TMR at primary amputation when expertise is available - a paradigm shift in nerve management.
Limitation: Small sample (N=28), single-blind, 1-year primary endpoint; conducted in a mixed upper- and lower-limb cohort.
TMR Enables Real-Time Myoelectric Control of Multifunction Arms
Kuiken TA, Li G, Lock BA, et al. • JAMA (2009)
Key Findings:
- 5 patients with shoulder-disarticulation or transhumeral amputation after TMR, compared with 5 able-bodied controls
- Pattern-recognition decoding of surface EMG allowed reliable performance of 10 distinct elbow, wrist and hand motions
- TMR patients completed 96.3% of elbow/wrist movements and 86.9% of hand movements within 5 seconds (controls 100% and 96.7%)
- Three patients demonstrated control of advanced motorised shoulder, elbow, wrist and hand prostheses
- Established TMR as a biological amplifier for intuitive prosthetic control
Clinical Implication: TMR converts amputated motor nerves into intuitive control sites, enabling pattern-recognition myoelectric prostheses to reproduce near-physiological multi-joint movement at proximal upper-limb levels where conventional control is poor.
Limitation: Very small proof-of-concept cohort, virtual-arm task metrics, no long-term functional follow-up.
Single-Digit Replantation vs Revision Amputation by Tamai Level
Zhu H, Bao B, Zheng X • Plast Reconstr Surg (2018)
Key Findings:
- 1023 patients with single-digit traumatic amputation - successful replantation versus revision amputation, stratified by Tamai level and digit
- Replantation gave NO functional benefit (Michigan Hand Questionnaire at 1 year) for small finger (levels I-V), ring finger (I-III) and long finger (level I)
- Replantation outperformed revision for thumb (all levels I-V), index (I-V), long finger (II-V) and ring finger (IV-V)
- Replantation cost more and lengthened hospital stay and sick leave
- Provides a digit- and level-specific evidence base for the replantation decision
Clinical Implication: The replantation-versus-amputation decision is digit- and level-specific. Always salvage the thumb and index; for distal small/ring/long-finger amputations a well-fashioned revision amputation may equal or beat replantation for function while saving time and cost.
Limitation: Retrospective, single high-volume centre in China; failed replants excluded; generalisability of cost data limited.
Upper Limb Prosthesis Use and Abandonment
Biddiss EA, Chau TT • Prosthet Orthot Int (2007)
Key Findings:
- Analytical review of ~200 articles (40 reporting rejection) across 25 years of upper-limb prosthesis literature
- Adult rejection: body-powered 26%, electric (myoelectric) 23%
- Paediatric rejection markedly higher: body-powered 45%, electric 35%
- Average non-wear similar in adults (20%) and children (16%)
- Wide variance reflects heterogeneous samples and non-standardised outcome measures
Clinical Implication: Roughly a quarter of adult upper-limb prosthesis users abandon their device. Device selection must match patient goals and occupation; standardised outcome measures and early fitting are needed to improve acceptance.
Limitation: Heterogeneous primary studies, variable definitions of rejection and follow-up.
Mirror Therapy Reverses Cortical Reorganisation in Phantom Limb Pain
Foell J, Bekrater-Bodmann R, Diers M, Flor H • Eur J Pain (2014)
Key Findings:
- 13 chronic phantom limb pain patients after unilateral arm amputation completed 4 weeks of daily mirror therapy
- Mean phantom pain fell by 27%
- fMRI showed pain reduction tracked with reversal of dysfunctional reorganisation in primary somatosensory cortex
- Telescoping of the phantom predicted poorer response
- Mechanistic link between body representation and analgesic effect
Clinical Implication: Mirror therapy is a simple, non-invasive treatment for phantom limb pain in upper-limb amputees, acting by normalising maladaptive cortical reorganisation. Should be part of standard rehabilitation.
Limitation: Small uncontrolled cohort, requires sustained patient engagement, modest average effect size.
Patient Perspectives on Upper-Limb Osseointegration
Resnik L, Benz H, Borgia M, Clark MA • PM R (2019)
Key Findings:
- National survey of US veterans with upper-limb amputation on attitudes to bone-anchored (osseointegrated) prostheses
- 28% of unilateral and 13% of bilateral amputees were willing to consider osseointegration surgery
- Transhumeral level was associated with greater willingness; older age and better mental-health scores with less
- Durability/reliability, ability to do more activities and comfort were the most valued benefits
- Chronic pain, loss of nerve function and device failure were the least acceptable risks
Clinical Implication: Osseointegration is an emerging socket-free option that solves suspension and comfort problems, especially at transhumeral level, but uptake is selective; benefit-risk counselling must centre on durability, function and the risk of infection or device failure.
Limitation: Survey of stated preference (not outcomes), US veteran population, device available only under Humanitarian Device Exemption at the time.
Clinical Decision Scenarios
Use these scenarios to practise clinical reasoning and management decisions
CLINICAL SCENARIOAdvanced
CLINICAL PROMPT
"A 28-year-old right-hand dominant male presents to the emergency department after his right hand was caught in an industrial press. Examination reveals crush injury to all fingers at the level of the proximal phalanges with devitalized tissue. The thumb metacarpal is fractured but the thumb itself is intact. There is no distal circulation to the fingers. The amputated finger segments have been retrieved but are severely crushed. How would you manage this patient?"
PRACTICAL APPROACH
This young patient has a severe crush injury with multiple devitalized fingers but a potentially salvageable thumb. My approach would be systematic. For immediate management, I would follow ATLS principles, provide analgesia, and administer IV antibiotics (cefazolin and gentamicin for contaminated wounds). I would examine the thumb carefully - if the thumb is viable with intact circulation, preserving it is the priority. Regarding the fingers, with severe crush mechanism and devitalized tissue, replantation is unlikely to succeed. I would counsel the patient about the realistic outcomes. My surgical plan would be to explore the hand under regional or general anaesthesia. For the fingers, I would perform ray amputations of the index, middle, ring, and little fingers at the metacarpal level if the proximal tissue is non-viable, or transmetacarpal amputation preserving maximum palmar tissue. For the thumb, I would assess viability, fix the metacarpal fracture if needed, and preserve all thumb length. I would perform traction neurectomy of the digital nerves and close with viable palmar flap tissue. Post-operatively, the patient will need hand therapy, psychological support, and eventually prosthetic assessment if desired. With a preserved thumb opposing the palm, he may have reasonable pinch function despite the devastating injury.
KEY CLINICAL POINTS
Thumb preservation is the priority - worth the entire hand functionally
Crush mechanism and devitalized tissue are contraindications to replantation
Ray amputation at base of metacarpals for non-viable fingers
Preserve palmar skin as it is more durable than dorsal
Early psychological support and hand therapy essential
COMMON PITFALLS
Attempting replantation of severely crushed digits with poor prognosis
Failing to recognize importance of thumb preservation
Not counselling patient adequately about realistic outcomes
Forgetting nerve management - leads to painful neuromas
FURTHER QUESTIONS
"What would change your management if the thumb was also non-viable?"
"What prosthetic options exist for this patient?"
"How would you manage phantom limb pain if it develops?"
CLINICAL SCENARIOStandard
CLINICAL PROMPT
"You are performing a transradial amputation for a 45-year-old woman with sarcoma of the distal radius. The oncology team requires a margin of 5cm proximal to the tumour, which leaves approximately 12cm of forearm from the elbow. Describe your surgical technique, focusing on nerve management and optimization for prosthetic function."
PRACTICAL APPROACH
This is a planned oncological amputation at transradial level with adequate residual forearm length for good prosthetic function. My technique would focus on optimizing the residual limb for prosthetic fitting while ensuring oncological margins. For positioning and planning, I would position supine with arm on a hand table, mark the level 5cm proximal to tumour as per oncology requirements, and plan equal anterior-posterior fish-mouth flaps. I would use a tourniquet proximally but avoid near the tumour. For soft tissue dissection, I would create skin flaps as marked, divide flexor and extensor muscles at the planned bone level, and identify and ligate radial and ulnar arteries. For nerve management, I would identify the median nerve between FDS and FDP, ulnar nerve medially, and radial sensory nerve laterally. Given this is a young patient who would benefit from optimal prosthetic control, I would perform TMR - transferring median and ulnar nerves to motor points in the remaining forearm flexor and extensor muscles. This provides multiple EMG control sites for a modern multi-articulating myoelectric hand while preventing neuroma formation. For bone management, I would divide radius and ulna with oscillating saw, cutting ulna 1cm shorter than radius, and smooth all bone edges with a rasp. For closure, I would perform myodesis of flexors to extensors over bone ends, close fascia, then skin without tension. Post-operatively, I would refer early to the prosthetic team for casting and fitting once healed. With TMR and 12cm forearm length, she should be a good candidate for a pattern-recognition myoelectric system with multi-function hand.
KEY CLINICAL POINTS
Adequate margin for oncological clearance is paramount
12cm from elbow provides good lever arm for prosthetic control
TMR provides intuitive myoelectric control and neuroma prevention
Median and ulnar transferred to forearm muscle motor points
Early prosthetic referral improves long-term outcomes
COMMON PITFALLS
Compromising oncological margin for stump length
Performing standard neurectomy when TMR would provide better outcomes
Not involving prosthetist early in planning
Creating tension at skin closure
FURTHER QUESTIONS
"What are the advantages of TMR over standard neurectomy?"
"What prosthetic options would you discuss with this patient?"
"How would you counsel her about expected function and prosthetic rejection rates?"
CLINICAL SCENARIOStandard
CLINICAL PROMPT
"A 16-year-old boy presents 4 hours after a clean guillotine amputation of his right thumb at the level of the proximal phalanx from a circular saw accident at his father's workshop. The amputated part has been kept in a plastic bag on ice. What are the indications for replantation here, and describe your management approach."
PRACTICAL APPROACH
This is an absolute indication for replantation. We have a pediatric patient with a thumb amputation from a clean sharp mechanism, within the ischaemia time window, with appropriately preserved amputated part. My approach would be immediate activation of the replantation team. For initial management, I would ensure the amputated part is stored correctly - wrapped in saline-moistened gauze, in plastic bag, on ice (not direct contact with ice). I would assess the patient (ATLS approach), obtain X-rays of both stump and amputated part, and take blood for group and hold. I would counsel the family about replantation - excellent prognosis given mechanism, age, and level. For surgical technique, this would be performed under general anaesthesia or brachial plexus block with tourniquet. I would debride both stump and amputated part conservatively to healthy tissue. The sequence would be bone shortening and fixation (K-wires or plate), then extensor tendon repair, then arterial anastomosis (both digital arteries if possible), then vein repair (at least 2:1 vein to artery ratio), then nerve repair (both digital nerves), then flexor tendon repair, and finally skin closure or graft. Post-operatively, I would keep the patient warm, well-hydrated, and the hand elevated. I would use vasodilators if needed, and monitor closely for 5-7 days. This boy has an excellent prognosis - children have remarkable regeneration potential, and clean sharp amputations of the thumb have survival rates exceeding 90% in experienced centers.
KEY CLINICAL POINTS
Thumb amputation is an absolute indication for replantation
Pediatric patients have excellent regeneration and outcomes
Clean sharp mechanism is ideal for replantation
4 hours ischaemia is well within acceptable window (less than 12 hours if cooled)
Replantation sequence: bone, tendon, artery, vein, nerve
COMMON PITFALLS
Not recognizing this as an absolute indication for replantation
Delaying surgery for non-essential investigations
Inadequate vein repair (need 2:1 ratio vein to artery)
Forgetting post-operative monitoring and anti-vasospasm measures
FURTHER QUESTIONS
"What would you do if arterial flow was established but venous congestion developed?"
"What rehabilitation would this patient require?"
"What are the expected sensory and motor outcomes after replantation?"
Controversies and Areas of Uncertainty
Acute (primary) vs delayed TMR/RPNI
Performing TMR or regenerative peripheral nerve interfaces (RPNI) at the time of amputation is increasingly advocated to prevent neuroma and phantom pain, but the highest-quality RCT evidence (Dumanian 2019) studied delayed/established pain. Whether routine prophylactic TMR in every amputee changes long-term outcomes - versus added operative time and cost - remains unproven.
TMR vs RPNI
Both convert cut nerves into a target. TMR transfers a nerve to a motor point (also yielding control signals); RPNI wraps the nerve end in a free muscle graft and is technically simpler with no donor muscle sacrifice. Comparative trials are lacking - choice is largely surgeon preference and whether myoelectric control sites are also wanted.
Replanting borderline single digits
Level III data (Zhu 2018) show no functional benefit of replanting small, ring (proximal) or distal long-finger amputations, at higher cost. Yet patient preference, occupation, cultural factors and bilateral injury may still justify attempts. The "replant everything" reflex is being replaced by selective, evidence-based salvage.
Osseointegration vs socket prostheses
Bone-anchored implants abolish socket discomfort and improve range and proprioception, but carry superficial/deep infection and mechanical failure risk and require staged surgery. Long-term comparative outcome data versus modern sockets are still maturing; uptake is selective and level-dependent.
Body-powered vs myoelectric
Despite advanced multi-articulating myoelectric hands, no consistent functional superiority over durable body-powered devices is shown in everyday tasks, and abandonment rates are similar. Sensory feedback restoration (sensorised prostheses, targeted sensory reinnervation) is an active research frontier.
Mangled upper limb - salvage vs amputation
Lower-limb scores (MESS) translate poorly to the upper limb, where a partially functional, sensate hand often outperforms any prosthesis. There is no validated upper-limb-specific decision score; the threshold for salvage is generally lower (more aggressive) than in the leg.
Guidelines, Registries & Global Practice
Global Epidemiology
- Upper-limb amputation is roughly 5 times less common than lower-limb amputation; in high-income settings the leading cause is trauma (occupational and machinery injury), whereas dysvascular and diabetic causes dominate the lower limb.
- Male predominance (~3:1) and a younger mean age than lower-limb amputees, reflecting occupational mechanism.
- In low- and middle-income countries, agricultural and industrial machinery, road trauma and conflict/blast injury are major contributors, often with delayed presentation that reduces replantation viability.
Guidelines and Society Guidance (side by side)
How Major Bodies Frame Upper Limb Amputation Care
| Body / Region | Emphasis | Practical recommendation |
|---|---|---|
| BOA / BSSH (UK) | Major trauma network triage; specialist hand/replant transfer | Potentially replantable injuries routed early to a replantation-capable unit; correct cooling and transfer |
| AAOS / ASSH (US) | Function-first level selection, early prosthetic referral | Preserve elbow and sensate length; multidisciplinary limb-loss rehabilitation pathways |
| ASRM / IFSSH (microsurgery) | Selective, evidence-based replantation | Always salvage thumb and multiple digits; selective approach to borderline single digits |
| ISPO (prosthetics, global) | Appropriate, sustainable prosthetic provision | Match device to need and resource setting; body-powered devices remain first line where service support is limited |
Registry and Outcome Data
- Upper-limb amputation and replantation lack the mature implant registries that exist for arthroplasty (NJR, AJRR, AOANJRR); evidence comes mainly from national administrative databases and large single-centre series (e.g. replantation volume-outcome relationships).
- Volume matters: higher institutional replantation volume is associated with higher digit-survival rates, supporting regionalised referral to specialist units.
- Emerging osseointegration outcome registries are beginning to capture infection and implant-survival data for bone-anchored upper-limb prostheses.
High- vs Limited-Resource Practice Variation
- High-resource: 24/7 microsurgical replantation, multi-articulating myoelectric hands, TMR/RPNI and osseointegration available in tertiary centres; structured limb-loss rehabilitation and peer support.
- Limited-resource: emphasis on durable revision amputation, sensate length preservation and robust body-powered or appropriate-technology prostheses; replantation reserved for the highest-yield cases (thumb, multiple digits) where microsurgical capacity exists.
- The functional priority (sensation greater than motion greater than length) and the imperative to preserve the elbow hold across all settings - they are decisions, not resources.
Upper Limb Amputation - Exam Quick Reference
Clinical summary
Key Priorities
- •Sensation GREATER THAN motion GREATER THAN length (opposite to lower limb)
- •Preserve elbow - loses 50% function if amputated above
- •Replant thumb at all costs - 50% of hand function
- •TMR prevents neuroma and phantom pain, improves prosthetic control
Replantation Indications (THUMB PLUS)
- •Thumb - single most important digit
- •Multiple digits, hand/wrist level
- •Pediatric patients (any level)
- •Clean sharp mechanism, short ischaemia time
Level-Specific Pearls
- •Finger: Preserve FDS/FDP insertion, volar flap for coverage
- •Wrist disarticulation: Preserves pronation-supination (DRUJ intact)
- •Transradial: Minimum 5cm from elbow, ideal for TMR and myoelectric
- •Transhumeral: Preserve deltoid insertion, TMR essential for function
Nerve Management
- •Standard: Traction neurectomy - pull, sharp transection, allow retraction
- •TMR: Transfer median to biceps, ulnar to brachialis, radial to triceps
- •Position nerves away from scar and pressure areas
- •TMR reduces both neuroma AND phantom limb pain
Prosthetic Considerations
- •Body-powered: Proprioceptive feedback, durable, works wet
- •Myoelectric: Cosmesis, grip strength, multiple patterns, no feedback
- •30-50% upper limb amputees reject prostheses - functional adaptation common
- •Early fitting improves long-term acceptance
Complications to Know
- •Phantom limb pain: 50-80%, mirror therapy effective, gabapentinoids
- •Neuroma: Prevented by TMR or traction neurectomy
- •Contracture: Elbow flexion (transhumeral) - early ROM essential
- •Prosthetic rejection: Common - address patient goals and expectations