High Yield Overview

SCARF OSTEOTOMY FOR MODERATE-SEVERE HALLUX VALGUS

Medial longitudinal approach to 1st metatarsal, extending from mid-proximal phalanx to mid-metatarsal shaft | advanced

Critical Danger Structures

Danger 1: Dorsomedial Cutaneous Nerve

Location: Crosses incision line 2-3mm dorsal to typical approach

Protection: Identify and retract during superficial dissection, stay on capsule

Danger 2: Medial Plantar Digital Nerve

Location: 8-10mm plantar to MTP joint line

Protection: Limit plantar dissection during eminence removal, stay on bone

Danger 3: Plantar Medial Neurovascular Bundle

Location: 12-15mm plantar to metatarsal shaft

Protection: Maintain periosteal sleeve, avoid excessive plantar dissection

Danger 4: Medial Plantar Sesamoid

Location: 4-5mm plantar to articular surface

Protection: Visualize during eminence resection, avoid over-resection

Danger 5: Lateral Digital Neurovascular Bundle

Location: 5mm lateral to lateral capsule

Protection: Gentle lateral release staying on capsule, avoid blind dissection

Mnemonic

Z-PLANESCARF Osteotomy Geometry

Mnemonic

PARALLELPreventing Troughing Malunion

Indications

Primary Indications

Moderate-to-severe hallux valgus: HVA 30-40°, IMA 13-18°
Symptomatic bunion deformity with pain, difficulty with shoe wear
Failed conservative management: appropriate shoes, orthotics, NSAIDs
Adequate bone stock for osteotomy and fixation
Motivated patient understanding rehabilitation requirements

Special Considerations

DMAA abnormality: Can be addressed with rotational component
Metatarsus primus varus: IMA correction primary goal
Short first metatarsal: Scarf allows lengthening if needed
High DASA: Consider adjunct Akin osteotomy

Contraindications

Absolute

Active infection in surgical field
Inadequate vascularity to forefoot
Severe osteoarthritis MTP joint (consider arthrodesis)
Non-ambulatory patient

Relative

Mild deformity (HVA <30°, IMA <13°) - consider chevron
Very severe deformity (IMA >20°) - consider proximal/MTP fusion
Significant medical comorbidities
Inflammatory arthropathy (higher recurrence risk)
Poor bone quality (osteoporosis)
Smoker (impaired healing)
Unrealistic patient expectations

Pre-operative Assessment

Clinical Evaluation

Severity: Measure HVA and IMA on weight-bearing AP radiographs
DMAA assessment: Lateral deviation of articular surface
Sesamoid position: Tibial sesamoid subluxation grade (0-3)
Joint congruency: Congruent vs incongruent joint
MTP ROM: Check for arthritis (limited ROM contraindication)
Foot alignment: Assess pes planus, metatarsus adductus
Lesser toe deformities: May need concurrent correction
Neurovascular status: Pulses, sensation, capillary refill

Radiographic Planning

Weight-bearing AP and lateral foot radiographs
Sesamoid axial view if available
Measure: HVA (normally <15°), IMA (normally <9°), DMAA (normally <10°)
Assess: Sesamoid position, MTP joint congruency, arthritis
Plan correction: Estimate translation needed (roughly 1mm lateral translation corrects 2° of IMA)

Patient Counseling

Expected outcomes: 85-90% satisfaction, significant pain relief
Recovery timeline: 6 weeks protected weight-bearing, 3-4 months return to activity
Complications: Recurrence 5-10%, transfer metatarsalgia 10-15%, nerve injury 5-10%
Hardware: Usually retained unless prominent
Footwear: May need wider toe box permanently

Positioning and Preparation

Patient Position: Supine with foot at end of table, bump under ipsilateral hip for neutral foot rotation

Anesthesia: Ankle block (preferred - allows immediate post-op assessment) or general anesthesia

Tourniquet: Ankle tourniquet (250mmHg) or thigh (300mmHg), exsanguinate with elevation

Equipment

Small fragment set with 2.5-3.0mm headless compression screws
Sagittal saw with 0.5-1.0mm blade
K-wires for provisional fixation
Fluoroscopy (optional but helpful)
Microsagittal saw for Akin if planned

Setup: Elevate foot on sterile towels or dedicated foot holder for access

Operative Steps

Step 1: Incision & Superficial Dissection

Technique: Medial longitudinal incision 6-8cm extending from mid-proximal phalanx to mid-metatarsal shaft, centered over first metatarsal. Position 2-3mm dorsal to joint line to avoid plantar digital nerve.

Key Points

Longer incision than chevron (need shaft exposure)
Sharp dissection through subcutaneous tissue
Identify and protect dorsomedial cutaneous nerve branches
Use self-retaining retractors for exposure

Exam Pearl

Technical Tip: "I make a medial longitudinal incision 6-8cm - longer than chevron because I need exposure of the entire metatarsal shaft for the scarf. I stay 2-3mm dorsal to the joint line to avoid the plantar digital nerve and carefully identify and protect the dorsomedial cutaneous nerve which crosses the field."

Dangers at this step

Dorsomedial cutaneous nerve injury (5-10% incidence) - runs 2-3mm dorsal
Medial plantar digital nerve if incision too plantar (8-10mm plantar to joint)
Inadequate incision length limiting osteotomy exposure

Step 2: Capsulotomy & Exposure

Technique: Inverted-L or linear capsulotomy along dorsomedial aspect of metatarsal and MTP joint. Extend proximally along entire metatarsal shaft to planned proximal osteotomy site. Preserve capsular flaps for later repair.

Key Points

Full-length exposure critical for scarf
Identify and protect lateral capsule (preserve for sesamoid stability)
Expose medial eminence, metatarsal neck, and shaft
Palpate and identify plantar cortex (guides osteotomy)
Minimal periosteal stripping laterally (AVN risk)

Exam Pearl

Technical Tip: "I perform capsulotomy extending the full length of the metatarsal shaft - this complete exposure is critical for scarf osteotomy. I carefully preserve capsular tissue for closure and identify the plantar cortex which will guide my osteotomy orientation to prevent troughing."

Dangers at this step

Excessive soft tissue stripping increases AVN risk (1-2%)
Lateral capsule damage destabilizes sesamoids
Loss of capsular tissue compromises closure and recurrence risk

Step 3: Medial Eminence Resection

Technique: Remove medial eminence with sagittal saw in line with medial border of metatarsal shaft. Typical resection 3-4mm. Smooth edges with rongeur. Palpate plantarly to ensure no plantar prominence.

Key Points

Cut in line with shaft (not excessive resection)
Over-resection destabilizes sesamoid complex
Increases hallux varus risk
Check no plantar prominence with finger

Exam Pearl

Technical Tip: "I resect the eminence in line with the medial shaft border - typically 3-4mm. Over-resection destabilizes the sesamoid complex and significantly increases hallux varus risk. I smooth the edges and confirm there is no plantar prominence that could cause ongoing symptoms."

Dangers at this step

Over-resection causing sesamoid instability and varus (2-5%)
Plantar digital nerve if cut extends plantarly
Thermal injury from saw - use irrigation

Step 4: Scarf Osteotomy Planning - CRITICAL STEP

Technique: Plan Z-shaped osteotomy with THREE cuts:

HORIZONTAL LIMB: Longitudinal along shaft, 2:1 ratio dorsal-to-plantar (dorsally based), PARALLEL to plantar cortex
PROXIMAL VERTICAL LIMB: 60° angle, exits DORSALLY
DISTAL VERTICAL LIMB: 60° angle, exits PLANTARLY

Length covers middle 60-70% of metatarsal (typically 25-30mm). Mark carefully with methylene blue or electrocautery.

Critical Geometry

Horizontal cut MUST be parallel to plantar cortex (prevents troughing)
2:1 dorsal:plantar ratio = cut in dorsal 2/3 of shaft
Opposite orientations of vertical cuts provide stability
Adequate length prevents stress risers

Exam Pearl

Technical Tip: "The scarf is Z-shaped with critical geometry. The HORIZONTAL limb must be at 2:1 dorsal-to-plantar ratio - this dorsally biased position prevents troughing which is the most common complication. The proximal limb exits DORSALLY while the distal limb exits PLANTARLY at 60° angles. This opposite orientation provides inherent stability and prevents dorsiflexion malunion."

Dangers at this step

Wrong ratio (1:1 or plantar-based) = TROUGHING malunion (5-10%)
Non-parallel cuts = instability and malunion
Horizontal limb too short = stress riser fracture (2-5%)
Incorrect angles alter stability

Step 5: Horizontal Longitudinal Cut

Technique: Using 0.5-1.0mm sagittal saw blade, make horizontal longitudinal cut along metatarsal shaft. Cut must be PARALLEL to plantar cortex. Place in DORSAL 2/3 of metatarsal (2:1 ratio). Length typically 25-30mm covering middle shaft. Continuous irrigation to prevent thermal necrosis.

Key Points

Palpate plantar cortex continuously during cutting
Blade parallel to plantar surface throughout
Incomplete cut (stop before full penetration of far cortex)
Copious irrigation prevents thermal injury

Exam Pearl

Technical Tip: "The horizontal cut must be PARALLEL to the plantar cortex - this is THE key technical point to prevent troughing which is the most common scarf complication at 5-10%. I continuously palpate the plantar cortex with my finger as I cut to ensure I'm maintaining parallel orientation. I place the cut in the dorsal 2/3 at exactly 2:1 ratio. Continuous irrigation prevents thermal necrosis."

Dangers at this step

Non-parallel cut = troughing (dorsiflexion malunion) - most common error
Thermal necrosis without irrigation causes AVN
Complete inadvertent fracture if saw exits unintentionally
Plantar penetration risks neurovascular bundle

Step 6: Proximal Vertical Cut

Technique: Make proximal vertical cut exiting DORSALLY at approximately 60° to horizontal cut. Connect to proximal end of horizontal cut. Complete through both cortices. Creates proximal arm of Z.

Key Points

60° angle to horizontal
Exit point on dorsal cortex
Complete cut through both cortices
Confirms mobility after cut

Exam Pearl

Technical Tip: "The proximal cut exits dorsally at 60° angle to the horizontal limb. This creates the proximal arm of the Z. I ensure complete cuts through both cortices - incomplete cuts make translation difficult and risk intraoperative fracture during manipulation."

Dangers at this step

Incomplete cut = difficulty with translation, fracture risk during manipulation
Exit point too far dorsal or plantar alters geometry and stability
Propagation of cut beyond intended endpoint

Step 7: Distal Vertical Cut

Technique: Make distal vertical cut exiting PLANTARLY at 60° to horizontal cut. Connect to distal end of horizontal cut. Complete Z-shaped osteotomy. Capital fragment now mobile.

Key Points

60° angle opposite to proximal
Exit point on plantar cortex (carefully)
Confirm fragment mobility
Opposite orientations provide stability

Exam Pearl

Technical Tip: "The distal cut exits plantarly at 60° - opposite orientation to the proximal cut. This completes the Z configuration. I confirm the capital fragment is mobile before attempting translation. The opposite orientations of the vertical cuts provide inherent rotational stability which is a key advantage of scarf geometry."

Dangers at this step

Cut too plantar = sesamoid injury risk
Incomplete cut = fracture during manipulation (2-5%)
Loss of proper cut orientation = loss of stability
Plantar neurovascular bundle at risk if cut too deep

Step 8: Translation & Multi-Planar Correction

Technique: Translate capital fragment LATERALLY - amount depends on IMA severity (typically 5-8mm, up to 10mm or 70% shaft width possible).

Multi-planar capability (advantage of scarf):

TRANSLATION: Primary correction for IMA (lateral shift)
ROTATION: Correct DMAA abnormality
SHORTENING: Reduce soft tissue tension if needed
PLANTARFLEXION: Slight plantar translation prevents transfer metatarsalgia

Impaction of fragments provides initial stability.

Key Points

Primary goal: lateral translation for IMA correction
Rule of thumb: 1mm translation ≈ 2° IMA correction
Up to 70% shaft width translation possible
Avoid excessive translation (AVN risk)
Slight plantarflexion prevents transfer metatarsalgia
Rotation addresses DMAA

Exam Pearl

Technical Tip: "Scarf allows true multi-planar correction which is its major advantage over chevron. My PRIMARY correction is lateral translation 5-8mm to address the IMA - roughly 1mm translation corrects 2° IMA. SECONDARY corrections include: rotation to address DMAA abnormality, shortening to reduce tension in tight soft tissues, and slight plantarflexion to prevent transfer metatarsalgia. Impaction of the fragments provides excellent initial stability."

Dangers at this step

Excessive translation more than 70% width = instability and AVN risk
Dorsiflexion malposition = transfer metatarsalgia (10-15%)
Overcorrection = hallux varus (2-5%)
Loss of bony contact = nonunion risk

Step 9: Provisional Fixation Assessment

Technique: Hold correction manually or with K-wire and assess:

Alignment in all planes
Sesamoid reduction under head
No rotational deformity
Appropriate metatarsal length
Capital fragment sits flush on shaft (no step-off)
Fluoroscopy confirms position if available

Key Points

Check before definitive fixation
Sesamoid reduction critical
No step-off dorsally or plantarly
Appropriate alignment

Exam Pearl

Technical Tip: "Before final fixation I carefully check: good alignment in all planes, sesamoids reduced under the metatarsal head, no rotational deformity, and appropriate metatarsal length. Fluoroscopy is helpful to confirm position before screw insertion - much easier to adjust now than after screws are placed."

Dangers at this step

Fixing malpositioned fragments requires revision
Missing step-off creates prominence and pain
Unreduced sesamoids = high recurrence risk

Step 10: Screw Fixation

Technique: TWO SCREWS perpendicular to osteotomy plane. Headless compression screws preferred (2.5-3.0mm diameter). Insert PROXIMAL screw first for control, then DISTAL screw. Both achieve bicortical purchase. Lag screw technique for compression across osteotomy.

Key Points

Two screws required (longer osteotomy than chevron)
Perpendicular to osteotomy plane maximizes compression
Headless screws avoid prominence and removal
Proximal screw first gives control
Lag technique provides compression
Bicortical purchase for stability

Exam Pearl

Technical Tip: "I fix the scarf with TWO headless compression screws perpendicular to the osteotomy plane. I insert the proximal screw first which gives me control of the capital fragment, then the distal screw. Perpendicular placement is critical to achieve compression across the osteotomy. I use headless screws which avoid prominence and don't require routine removal - much better patient satisfaction."

Dangers at this step

Screw prominence if not headless (patient dissatisfaction)
Loss of correction if screws not perpendicular to osteotomy
Screw penetration into MTP joint space
Intraoperative fracture during screw insertion
Inadequate purchase in osteoporotic bone

Step 11: Check Correction & Sesamoid Position

Technique: Assess final correction:

Clinical: Straight alignment, toe points straight ahead, appropriate length, no rotation
Radiographic: Fluoroscopy confirms hardware position, alignment, sesamoid reduction
Critical endpoint: Sesamoids reduced under metatarsal head

Key Points

Sesamoid reduction is CRITICAL endpoint
If not reduced: need lateral soft tissue release
Confirm no hardware complications
Check alignment in all planes

Exam Pearl

Technical Tip: "I confirm the sesamoids are reduced under the metatarsal head - this is a critical endpoint that predicts long-term success. If the sesamoids are not reduced despite bony correction, I need to perform a lateral soft tissue release. Fluoroscopy confirms final alignment and proper hardware position without joint penetration."

Dangers at this step

Unreduced sesamoids = very high recurrence risk (up to 50%)
Missing rotational malalignment (subtle but important)
Hardware malposition into joint or with prominence

Step 12: Lateral Release (if indicated)

Technique: If sesamoids not reduced after bony correction: lateral soft tissue release required.

Approach options:

Through medial incision if accessible
Separate dorsal incision between 1st-2nd metatarsals (preferred)

Release: Lateral capsule, adductor hallucis tendon from lateral base proximal phalanx

Critical: PROTECT lateral digital neurovascular bundle (5mm lateral to capsule)

Key Points

Indicated if sesamoids unreduced
Release lateral capsule and adductor
Stay on capsular layer
Protect neurovascular bundle 5mm lateral
Recheck sesamoid position after release

Exam Pearl

Technical Tip: "I perform lateral release if sesamoids remain unreduced after bony correction. I release the lateral capsule and detach the adductor hallucis tendon from the base of the proximal phalanx. The critical danger is the lateral digital neurovascular bundle which runs 5mm lateral to the capsule - injury causes numbness and chronic pain. I stay on the capsular layer and use gentle dissection."

Dangers at this step

Lateral digital neurovascular injury (5mm from capsule) causes numbness
Overcorrection if too aggressive = hallux varus (2-5%)
Vascular compromise to hallux from excessive release

Step 13: Akin Osteotomy (adjunct procedure)

Technique: Add Akin osteotomy if:

Residual HVA greater than 15° after scarf correction
DASA greater than 10° (interphalangeal valgus component)
To optimize final correction and alignment

Medial-based closing wedge at proximal phalanx base, 2-3mm wedge. Fix with single headless screw or staple.

Key Points

Common adjunct (30-40% of cases)
Addresses interphalangeal component
Small wedge (2-3mm adequate)
Single screw or staple fixation
Avoid overcorrection

Exam Pearl

Technical Tip: "Akin osteotomy is a common adjunct to scarf - I add it in about 30-40% of cases when there's residual HVA greater than 15° after the metatarsal correction or when DASA is elevated above 10° indicating interphalangeal valgus. It's a medial closing wedge at the base of the proximal phalanx, typically 2-3mm. I must be careful not to overcorrect which causes interphalangeal varus deformity."

Dangers at this step

Overcorrection = interphalangeal varus deformity
Inadequate fixation = displacement
IP joint stiffness from periosteal stripping
Neurovascular injury if dissection too aggressive

Step 14: Capsular Repair

Technique: MEDIAL CAPSULE REEFING critical for soft tissue balance. Imbricate (overlap) medial capsule using "pants-over-vest" or "vest-over-pants" technique. Balance tension - adequate to maintain correction but not causing stiffness. Use absorbable sutures (2-0 or 3-0 Vicryl).

Key Points

Soft tissue balance as important as bone
Overlap capsule for imbrication
Balanced tension (not too tight, not too loose)
Too loose = recurrence from laxity
Too tight = stiffness, overcorrection
Multiple interrupted sutures

Exam Pearl

Technical Tip: "I reef the medial capsule to address the soft tissue laxity and maintain the correction - this soft tissue component is as important as the bony correction. I overlap the capsular edges (imbrication) with carefully balanced tension. Too loose allows recurrence from medial laxity, too tight causes stiffness and possible overcorrection. I aim for the toe to rest in slight overcorrection but still mobile."

Dangers at this step

Overtightening = stiffness, limited ROM, overcorrection
Inadequate closure = recurrence from persistent medial laxity (5-10%)
Devascularization from excessive handling

Step 15: Closure & Bunion Dressing

Technique:

Subcutaneous closure with absorbable sutures (3-0 Vicryl)
Skin with subcuticular 4-0 Monocryl or interrupted 4-0 nylon
BUNION DRESSING essential:
- Gauze between 1st and 2nd toes
- Toe maintained in corrected position with gauze padding
- Circumferential compression wrap (not too tight)
- Stiff-soled postoperative shoe

Key Points

Layered closure
Bunion dressing maintains correction
Gauze between toes prevents drift
Compression controls swelling
Postop shoe protects osteotomy

Exam Pearl

Technical Tip: "I close in layers and apply a proper bunion dressing which is essential to maintain the toe in corrected alignment during early healing. I place gauze between the 1st and 2nd toes to prevent drift back into valgus, apply circumferential compression to control swelling, and provide a stiff-soled postoperative shoe which protects the osteotomy for the critical first 6 weeks."

Dangers at this step

Wound dehiscence (5-10%) - especially in thin skin overlying eminence
Loss of correction if inadequate dressing applied
Vascular compromise from overly tight dressing
Skin necrosis from pressure points

Exam Viva Scenarios

Practice these scenarios to excel in your viva examination

VIVA SCENARIOStandard

EXAMINER

"What is troughing and how do you prevent it during scarf osteotomy?"

EXCEPTIONAL ANSWER

Troughing is dorsiflexion malunion where the capital fragment sinks dorsally into the metatarsal shaft creating a 'trough' deformity. It's the most common technical complication of scarf osteotomy occurring in 5-10% of cases. It causes transfer metatarsalgia to the lesser rays and is visible on radiographs as dorsal angulation at the osteotomy site. Prevention requires four key technical points: First, the horizontal cut must be PARALLEL to the plantar cortex throughout its length - I continuously palpate the plantar cortex with my finger during cutting to ensure this. Second, maintain a 2:1 dorsal to plantar ratio which keeps the cut in the dorsal two-thirds of the shaft. Third, avoid any dorsal angulation during the cutting - the blade must stay level. Fourth, position the capital fragment with slight plantarflexion and ensure good bony contact with impaction. If the horizontal cut is not parallel, the capital fragment will tend to dorsally angulate causing troughing.

VIVA SCENARIOStandard

EXAMINER

"Compare scarf and chevron osteotomies - when would you choose each and what are the key differences?"

EXCEPTIONAL ANSWER

Both are distal metatarsal osteotomies for hallux valgus but have distinct indications and characteristics. CHEVRON is my choice for mild to moderate deformity with HVA up to 30° and IMA up to 13°. It's a V-shaped osteotomy that's technically simpler with inherent stability from the geometry allowing single screw fixation. It has lower AVN risk around 0.5% and is quicker to perform. However, it allows limited translation - maximum 50% of shaft width - and is essentially a one-plane correction. SCARF is indicated for moderate to severe deformity with HVA 30-40° and IMA 13-18°. The key advantages are: it allows greater translation up to 70% of shaft width, provides true multi-planar correction - I can translate laterally, rotate to correct DMAA, shorten if needed, and plantarflex to prevent transfer metatarsalgia. The Z-shaped geometry provides excellent stability despite being a longer osteotomy. The disadvantages are: technically more demanding requiring full shaft exposure, requires two screws for fixation, slightly higher AVN risk at 1-2%, longer operative time, and the unique risk of troughing malunion from technical error. For severe deformity beyond scarf's range - IMA greater than 20° - I'd consider proximal osteotomy or MTP fusion.

VIVA SCENARIOStandard

EXAMINER

"After completing a scarf osteotomy with good bony correction, you check fluoroscopy and note the sesamoids are not reduced. What do you do and why is this important?"

EXCEPTIONAL ANSWER

Unreduced sesamoids after bony correction is a critical finding that must be addressed - it's associated with recurrence rates up to 50% if left uncorrected. Sesamoid reduction under the metatarsal head is one of my key endpoints for successful hallux valgus surgery. If the sesamoids remain subluxated despite adequate lateral translation of the metatarsal, this indicates the lateral soft tissue contractures are severe enough to require release. I would perform a lateral soft tissue release. My approach is typically through a separate small dorsal incision in the first web space between the first and second metatarsals. I release the lateral capsule of the MTP joint and detach the adductor hallucis tendon from its insertion on the lateral base of the proximal phalanx and lateral sesamoid. The critical danger here is the lateral digital neurovascular bundle which runs approximately 5mm lateral to the lateral capsule - injury causes permanent numbness of the lateral hallux and potential chronic pain. I stay directly on the capsular layer and use gentle spreading dissection. After release, I recheck the sesamoid position both clinically and fluoroscopically. The sesamoids should sit reduced under the metatarsal head. If still unreduced after adequate release, I would reassess my bony correction - I may need more lateral translation or there may be malrotation preventing sesamoid reduction.

Scarf Osteotomy - Exam Day Summary

High-Yield Exam Summary

References

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Deenik A, van Mameren H, de Visser E, et al. Equivalent correction in scarf and chevron osteotomy in moderate and severe hallux valgus: a randomized controlled trial. Foot Ankle Int. 2008;29(12):1209-1215. PMID: 19138484.
Bock P, Kluger R, Kristen KH, et al. The Scarf osteotomy with minimally invasive lateral release for treatment of hallux valgus deformity: intermediate and long-term results. J Bone Joint Surg Am. 2015;97(15):1238-1245. PMID: 26246258.
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Scarf Osteotomy for Moderate-Severe Hallux Valgus