Comprehensive guide to the anterior deltopectoral approach - surgical anatomy, technique, indications, complications, and viva preparation for orthopaedic exams
Reviewed by OrthoVellum Editorial Team
Orthopaedic clinicians and medical editors • Published by OrthoVellum Medical Education Team
Workhorse Approach | Internervous | Extensile | Most Versatile
Deltoid receives axillary nerve. Pectoralis major receives medial and lateral pectoral nerves. The interval between them is truly internervous - no motor nerves are divided. This is why it is so safe and can be re-entered repeatedly.
The cephalic vein runs in the deltopectoral groove and is your key landmark. Take it laterally with deltoid (preferred) or medially with pectoralis. Preserving it reduces venous congestion and maintains collateral drainage.
The axillary nerve descends 5cm below the coracoid tip within the deltoid. Avoid inferior retraction of the deltoid beyond 5cm from coracoid. Use stay sutures on deltoid rather than forceful retraction.
The musculocutaneous nerve enters coracobrachialis 3-8cm distal to coracoid tip (average 5cm). During deep dissection medial to conjoint tendon, protect this nerve. Avoid aggressive medial retraction of conjoint tendon.
| Indication | Positioning | Key Exposure | Critical Step |
|---|---|---|---|
| Shoulder arthroplasty | Beach chair, head secured | Full subscapularis exposure, glenoid access | Subscapularis peel or lesser tuberosity osteotomy |
| Proximal humerus ORIF | Beach chair or semi-recumbent | Proximal humerus, tuberosities | Identify axillary nerve before inferior dissection |
| Open Bankart repair | Beach chair or lateral decubitus | Anterior glenoid, subscapularis split | Subscapularis horizontal split at junction middle/lower third |
| Bone block (Latarjet/Eden-Hybinette) | Beach chair, arm mobile | Subscapularis split, glenoid neck | Protect musculocutaneous nerve medially during coracoid transfer |
Memory Hook:The CEPHALIC vein is your roadmap to the shoulder - preserve it and stay safe
Memory Hook:Remember the DANGERS to avoid complications during the deltopectoral approach
Memory Hook:The SUBSCAP management determines success of shoulder surgery - get this right
The anterior deltopectoral approach is the workhorse approach to the shoulder. First described by von Langenbeck in 1857, it remains the most versatile and widely used approach for shoulder surgery. Its popularity stems from the fact that it is a true internervous plane, provides excellent exposure of anterior and superior shoulder structures, and can be extended proximally and distally for extensive procedures.
Why this approach is preferred:
Internervous Plane
The deltopectoral approach is a true internervous plane. The deltoid is innervated by the axillary nerve (C5, C6), while pectoralis major is innervated by the medial and lateral pectoral nerves (C5-T1). No motor nerves cross the plane of dissection, making it inherently safe.
Primary indications:
Surface landmarks:
The deltopectoral interval:
The interval between the deltoid and pectoralis major is one of the few true internervous planes in the body. The deltoid is supplied by the axillary nerve (posterior cord, C5-6), while pectoralis major has dual innervation from medial pectoral (medial cord, C8-T1) and lateral pectoral (lateral cord, C5-7) nerves. No motor nerves cross this plane.
Key anatomical structures:
| Structure | Location | Clinical Significance |
|---|---|---|
| Cephalic vein | Runs in deltopectoral groove, from basilic to axillary vein | Key landmark - preserve if possible, take laterally with deltoid |
| Deltoid branch (thoracoacromial) | Crosses superior aspect of deltopectoral groove | Ligate to allow superior retraction of deltoid |
| Axillary nerve | Exits quadrangular space, wraps around surgical neck 5cm below coracoid | At risk with inferior deltoid retraction - do not retract more than 5cm below coracoid |
| Musculocutaneous nerve | Pierces coracobrachialis 3-8cm (mean 5cm) from coracoid tip | At risk during deep medial dissection - protect during conjoint tendon retraction |
| Conjoint tendon | Coracobrachialis and short head biceps, origin from coracoid | Medial landmark for deep dissection |
| Subscapularis | From subscapular fossa to lesser tuberosity | Must be split, peeled, or osteotomized for glenoid access |
| Long head of biceps | Runs in bicipital groove, intra-articular origin | Landmark for lesser tuberosity (medial border of groove) |
Vascular anatomy: The cephalic vein is the most visible vessel in this approach. It arises from the dorsal venous arch of the hand, ascends along the radial forearm and anterolateral arm, then enters the deltopectoral groove and pierces the clavipectoral fascia to drain into the axillary vein. Preservation of the cephalic vein reduces postoperative venous congestion and maintains collateral drainage.
Nerve anatomy:
The deltopectoral approach utilizes the interval between the Deltoid (Axillary Nerve, C5-6) and the Pectoralis Major (Medial and Lateral Pectoral Nerves, C5-T1). Because these muscles are supplied by different nerves, the interval can be developed safely without denervating any muscle fibers. This makes it one of the safest and most extensile approaches in the body.
Advantages:
The beach chair position is preferred by most surgeons for shoulder arthroplasty and open procedures.
Setup:
Patient supine on standard OR table with beach chair attachment. Back of table elevated 30-45 degrees. Hips and knees flexed for comfort and to prevent sliding.
Head secured in padded head holder or ring. Head neutral or slightly tilted to contralateral side. Avoid excessive rotation to prevent cerebral hypoperfusion.
Arm free draped and mobile. Place pneumatic arm holder or use assistant/Mayo stand for support during surgery. Arm must be freely mobile for assessment.
Pad contralateral shoulder, elbows, sacrum, heels. Check no pressure on peroneal nerve at fibular head if legs positioned laterally.
Maintain mean arterial pressure greater than 70mmHg in beach chair position to prevent cerebral hypoperfusion. Risk of watershed infarcts if hypotensive. Communicate with anesthesia if hypotension occurs.
Standard Deltopectoral Approach Variants
| Variation | Incision Length | Indications | Key Features |
|---|---|---|---|
| Standard | 10-15cm | Shoulder arthroplasty, fracture ORIF | Full exposure from acromion to deltoid insertion |
| Limited/Mini | 5-8cm | Anterior instability repair, biceps procedures | Centered on coracoid, limited inferior extension |
| Extended superior | 15-18cm | Clavicle/AC joint procedures combined with shoulder | Extends to clavicle, may include clavicular osteotomy |
| Extended inferior | 15-20cm | Proximal humeral tumors, long-stem revision | Extends distally along lateral arm for humeral access |
Patient Factors Affecting Approach
Physical Examination Relevant to Approach
Range of Motion Assessment
Plain Radiographs
CT Scan
MRI
When to Use Deltopectoral Approach
| Indication | Suitability | Notes |
|---|---|---|
| Shoulder arthroplasty (TSA/RSA) | Preferred approach | Excellent glenoid and humeral access |
| Proximal humerus fracture ORIF | Preferred approach | Direct access to tuberosities and head |
| Anterior instability (open) | Standard approach | Access to anterior glenoid and labrum |
| Biceps tendon procedures | Suitable | Access to bicipital groove |
| Rotator cuff repair | Alternative | Arthroscopic or lateral approach often preferred |
Marking:
Incision length:
Incision Direction
The incision should be placed in Langer's lines (parallel to relaxed skin tension lines) when possible, but the priority is following the deltopectoral groove. This typically creates an oblique incision from superolateral to inferomedial.
Incise skin and subcutaneous tissue sharply in line with incision down to superficial fascia. Use cutting diathermy or scalpel. Achieve hemostasis with bipolar cautery.
The deltopectoral groove is immediately apparent as a depression with the cephalic vein running within it. The deltoid is lateral (muscular, bulky), pectoralis major is medial (more tendinous superiorly).
Identify cephalic vein within deltopectoral fat stripe. Decision: take vein laterally with deltoid (preferred) or medially with pectoralis. Ligate perforating branches but preserve main trunk if possible.
Using blunt dissection, develop the interval between deltoid and pectoralis major. This should be avascular and easy to develop. Use finger or gauze to sweep the tissues apart.
Taking the cephalic vein laterally with the deltoid is preferred. This preserves venous drainage from the arm and reduces postoperative swelling. If the vein is injured, ligate both ends to prevent bleeding and thrombosis.
| Complication | Incidence | Prevention | Management |
|---|---|---|---|
| Axillary nerve injury | Less than 1% | Avoid inferior deltoid retraction beyond 5cm from coracoid; use stay sutures not retractors | Document neurapraxia postop; observe 3-6 months; EMG if no recovery at 6 weeks; consider exploration if complete palsy |
| Musculocutaneous nerve injury | Less than 1% | Protect during medial dissection; avoid aggressive conjoint retraction | Usually neurapraxia; observe; most recover by 3-6 months |
| Subscapularis failure | 2-5% (higher in revision) | Anatomic repair with multiple sutures; avoid overtensioning or undertensioning | Revision repair if acute; salvage with pectoralis major transfer if chronic |
| Stiffness/adhesions | 10-20% | Early passive ROM; aggressive PT | Therapy intensification; manipulation under anesthesia if severe; arthroscopic lysis if refractory |
| Infection (superficial) | 1-2% | Perioperative antibiotics; sterile technique | Oral antibiotics; wound care; debridement if abscess |
| Infection (deep) | Less than 1% | Perioperative antibiotics; minimize OR time; meticulous hemostasis | Return to OR; washout; debridement; culture-directed antibiotics; implant retention if acute, removal if chronic |
| Cephalic vein injury | Variable | Careful dissection; preserve vein if possible | Ligate both ends if transected; no long-term sequelae but increases postop swelling transiently |
The axillary nerve exits the quadrangular space posteriorly, wraps around the surgical neck of the humerus, and gives off its anterior branch approximately 5cm below the tip of the coracoid. Placing inferior retractors on the deltoid beyond this distance puts direct traction on the nerve.
Prevention strategies:
Immediate Postoperative Care
Rehabilitation Phases
| Phase | Timeframe | Goals | Restrictions |
|---|---|---|---|
| Protection | 0-4 weeks | Protect subscapularis repair, pain control | No active internal rotation, sling at all times |
| Early motion | 4-8 weeks | Passive ROM restoration | Therapist-assisted only, no active motion |
| Active motion | 8-12 weeks | Active-assisted to active ROM | Avoid resisted internal rotation |
| Strengthening | 12-16 weeks | Progressive strengthening | Gradual return to function |
Approach-Related Outcomes
| Outcome Measure | Result | Notes |
|---|---|---|
| Nerve injury rate | Less than 1-2% | Axillary nerve most common, usually neurapraxia |
| Subscapularis healing (peel) | 70-80% | May be asymptomatic if partial failure |
| Subscapularis healing (LTO) | 90-95% | Bone-to-bone healing superior |
| Wound complication rate | 1-3% | Superficial infection, dehiscence |
| Stiffness requiring intervention | 5-10% | MUA or arthroscopic release if refractory |
Practice these scenarios to excel in your viva examination
"The examiner asks: 'Describe the anterior deltopectoral approach to the shoulder. What are the key landmarks and structures at risk?'"
"During a deltopectoral approach for shoulder arthroplasty, you place an inferior retractor on the deltoid. Your registrar tells you they felt a 'pop' and now the deltoid feels softer. What has happened and how do you manage this?"
"A patient returns 6 months after total shoulder arthroplasty via deltopectoral approach with loss of active internal rotation and anterior instability. MRI confirms complete subscapularis rupture. How do you manage this?"
Internervous Plane
Q: The deltopectoral approach is a true internervous plane between which two muscles and their respective nerve supplies? A: Deltoid (axillary nerve, C5-6) and pectoralis major (medial and lateral pectoral nerves, C5-T1). No motor nerves are divided in this approach, making it safe and repeatable.
Key Landmark
Q: What is the key superficial landmark for the deltopectoral approach and what is the preferred management? A: The cephalic vein running in the deltopectoral groove. Preferred management is to take it laterally with the deltoid to preserve venous drainage from the upper limb and reduce postoperative swelling.
Axillary Nerve Safety
Q: How far below the coracoid tip does the anterior branch of the axillary nerve descend, and what is the clinical implication? A: The axillary nerve descends approximately 5cm below the coracoid tip within the deltoid muscle. Inferior retraction of the deltoid beyond this distance risks axillary nerve traction injury. Use stay sutures rather than rigid retractors.
Musculocutaneous Nerve
Q: Where does the musculocutaneous nerve pierce the coracobrachialis muscle and why is this clinically important? A: The musculocutaneous nerve pierces coracobrachialis 3-8cm distal to the coracoid tip (average 5cm, but highly variable). Aggressive medial retraction of the conjoint tendon during deep dissection can injure this nerve, causing loss of biceps and brachialis function and sensory loss over lateral forearm.
Subscapularis Management
Q: What are the three main techniques for managing the subscapularis in the deltopectoral approach and when is each used? A: 1. Subscapularis peel - peeling tendon off lesser tuberosity (arthroplasty, extensive exposure). 2. Lesser tuberosity osteotomy - bone-tendon unit preserved (revision arthroplasty, poor tendon quality). 3. Subscapularis split - horizontal split at junction upper 2/3 and lower 1/3 (instability procedures, limited exposure). Peel and osteotomy are for arthroplasty; split is for instability.
Subscapularis Repair
Q: Why is subscapularis repair critical after deltopectoral approach and what happens if it fails? A: Subscapularis is the primary anterior stabilizer and internal rotator of the shoulder. Failure to repair leads to anterior instability, loss of active internal rotation, and poor functional outcomes. The subscapularis must be repaired anatomically to the lesser tuberosity with multiple heavy sutures.
Epidemiology: The deltopectoral approach is the standard approach for shoulder arthroplasty in Australia. According to the Australian Orthopaedic Association National Joint Replacement Registry (AOANJRR), shoulder arthroplasty rates have increased significantly over the past decade, with over 5,000 primary shoulder replacements performed annually.
Practice patterns:
Medicolegal considerations:
Training: The deltopectoral approach is a core skill for orthopaedic trainees in Australia. Competence is expected for Orthopaedic examination and is a requirement for independent practice in shoulder surgery.
High-Yield Exam Summary