Anterior Approach to the Elbow (Antecubital)

The anterior (antecubital) approach to the elbow is the distal continuation of the Henry approach to the arm and provides excellent access to the antecubital fossa, distal biceps insertion, anterior capsule, coronoid process, and the neurovascular structures of the elbow. It is most commonly performed through a lazy-S or curved incision that begins medial proximally and curves laterally distally to minimise skin contracture. The critical structures at risk are the brachial artery (central), median nerve (medial to artery), lateral antebrachial cutaneous nerve (lateral to biceps), and the radial nerve/PIN (lateral interval between brachialis and brachioradialis). Primary indications include distal biceps tendon repair, anterior capsular release for stiffness, exploration of the brachial artery or median nerve, and access to coronoid fractures. The approach carries a significant risk of anterior scarring and subsequent flexion contracture if soft tissues are not handled gently.

Primary Indications:

• Distal biceps tendon rupture repair (acute and chronic)
• Anterior capsular release for post-traumatic or post-operative elbow stiffness
• Exploration and repair of brachial artery injury
• Median nerve exploration or decompression at the elbow
• Coronoid process fracture fixation (anterior access)
• Radial nerve or PIN exploration in the proximal forearm

Why This Approach is Chosen: The anterior approach provides direct access to the antecubital fossa and the structures crossing the elbow joint. It is the only approach that allows simultaneous visualisation of the brachial artery, median nerve, distal biceps insertion, and anterior capsule. The lazy-S incision minimises the risk of skin contracture that would occur with a straight transverse incision.

Contraindications:

• Active infection in the antecubital fossa
• Severe soft-tissue scarring from previous surgery or trauma (consider alternative or extensile approaches)
• Isolated posterior pathology (use posterior approaches)
• Patient factors precluding positioning or tourniquet use

Alternative Approaches:

• Posterior approach (Kocher or Bryan-Morrey): For triceps, olecranon, or posterior capsule pathology
• Medial approach: For ulnar nerve, medial collateral ligament, or medial coronoid
• Lateral approach (Kocher): For radial head, capitellum, or lateral collateral ligament
• Two-incision technique for distal biceps: Reduces PIN risk but sacrifices anterior visualisation

Bony Anatomy: The antecubital fossa is a triangular space bounded medially by the pronator teres, laterally by the brachioradialis, and superiorly by an imaginary line between the medial and lateral epicondyles. The floor is formed by the brachialis muscle proximally and the supinator distally. The radial head and capitellum lie deep in the lateral aspect of the fossa. The coronoid process of the ulna is accessible anteriorly when the elbow is flexed.

Muscular Layers:

|| Layer | Muscle | Nerve Supply | Action || ||-------|--------|--------------|--------|| || Superficial | Biceps brachii | Musculocutaneous | Elbow flexion, supination || || Superficial | Brachialis | Musculocutaneous (radial) | Elbow flexion || || Deep medial | Pronator teres | Median | Forearm pronation || || Deep lateral | Brachioradialis | Radial | Elbow flexion in neutral || || Deep lateral | Supinator | PIN | Forearm supination ||

Neurovascular Anatomy:

|| Structure | Location | Clinical Significance || ||-----------|----------|----------------------|| || Brachial artery | Central in fossa, deep to bicipital aponeurosis | Primary landmark - identify early || || Median nerve | Medial to brachial artery | Most commonly injured structure || || Lateral antebrachial cutaneous nerve | Lateral to biceps tendon under fascia | Sensory to lateral forearm || || Radial nerve | Between brachialis and brachioradialis | Divides into SRN and PIN || || Posterior interosseous nerve | Lateral to radial tuberosity | At risk during distal biceps repair || || Cephalic vein | Lateral subcutaneous | May require ligation || || Basilic vein | Medial subcutaneous | Protect during medial dissection ||

Deep Internervous Plane:

• Between: Brachialis (musculocutaneous nerve) medially and brachioradialis (radial nerve) laterally
• Clinical relevance: This is the safe interval that allows access to the anterior capsule and radial head without denervating either muscle group

Superficial Dissection: There is no true internervous plane superficially. The skin incision crosses the territory of the lateral antebrachial cutaneous nerve laterally and the medial antebrachial cutaneous nerve medially. These nerves must be identified and protected under the subcutaneous fat.

Structures at Risk in Each Layer:

|| Layer | Structure | Protection Strategy || ||-------|-----------|-------------------|| || Superficial | Lateral antebrachial cutaneous nerve | Identify under fascia lateral to biceps, protect with vessel loop || || Deep medial | Median nerve and brachial artery | Identify artery first, nerve lies immediately medial, vessel loop both || || Deep lateral | Radial nerve / PIN | Identify in interval between brachialis and brachioradialis, protect during retraction || || Deep | Anterior capsule | Incise carefully, protect coronoid and radial head articular surfaces ||

Position: Supine with Arm on Hand Table

Pre-positioning Checklist:

• Confirm tourniquet available and functional (usually applied high on arm)
• Arm board or hand table positioned for full elbow access
• C-arm or fluoroscopy available for lateral and AP views
• Patient positioned with shoulder at edge of table for full arm mobility
• Padding for all pressure points including contralateral arm

Positioning Details:

• Supine position with arm abducted on hand table
• Elbow slightly flexed (30-45 degrees) for initial exposure
• Tourniquet applied high on arm, inflated after exsanguination
• Forearm can be pronated or supinated as needed during dissection
• Sterile prep from axilla to hand, including tourniquet

Alternative Positioning:

• Lateral decubitus with arm over bolster (less common for anterior approach)
• Prone position rarely used for anterior elbow surgery

Key Bony Landmarks:

• Medial epicondyle - palpable prominence on medial humerus
• Lateral epicondyle - palpable prominence on lateral humerus
• Radial head - palpable in the lateral aspect of the fossa with forearm rotation
• Olecranon - posterior landmark for orientation

Key Soft Tissue Landmarks:

• Biceps tendon - palpable cord in the antecubital fossa when elbow flexed against resistance
• Bicipital aponeurosis - felt as a tense band medial to the biceps tendon
• Cephalic vein - visible or palpable in the lateral subcutaneous tissue
• Brachial artery pulse - palpable in the midline of the fossa

Incision Planning:

• Lazy-S incision: begins 5-6 cm proximal to the elbow crease on the medial arm, crosses the fossa in a gentle S-curve, and extends 5-6 cm distal to the crease on the lateral forearm
• Total length approximately 12-15 cm
• Proximal limb lies over the medial border of the biceps
• Distal limb lies over the interval between brachioradialis and pronator teres
• The curve of the S should be centred over the flexion crease

Nerve Injury Management:

• If nerve identified as damaged intra-operatively: primary repair if transected, or tag ends for later repair
• If neurapraxia suspected: observe, document, follow up closely with serial examinations
• Post-operative deficit: urgent EMG/NCS at 3 weeks, consider exploration if no recovery by 3 months

Proximal Extension:

• Extend the incision proximally along the medial border of the biceps
• This is a direct continuation of the Henry approach to the arm
• Allows exposure of the distal humerus and brachial artery in the arm
• The median nerve and brachial artery remain the key structures to protect

Distal Extension:

• Extend the incision distally along the lateral forearm
• Develop the interval between brachioradialis and pronator teres
• Allows access to the proximal radius and radial head
• The PIN must be identified and protected as it enters the supinator

Fibular Head / Radial Head Access:

• The radial head is accessible in the lateral aspect of the fossa
• For radial head replacement or ORIF, the lateral interval provides excellent exposure
• Protect the PIN during radial head work

Combined Approaches:

• For complex elbow trauma, the anterior approach may be combined with a lateral (Kocher) approach for the radial head and lateral collateral ligament
• A medial approach can be added for ulnar nerve or medial collateral ligament work
• Staged positioning may be required for multiple approaches

Intra-operative Complications:

|| Complication | Prevention | Management || ||--------------|------------|------------|| || Brachial artery injury | Early identification, gentle handling | Direct repair, vein patch, or vascular surgery consult || || Median nerve injury | Identify medial to artery, vessel loop | Primary repair if transected, tag for delayed repair || || Lateral antebrachial cutaneous nerve injury | Identify under fascia, protect | If divided, may result in permanent numbness || || PIN injury | Identify in lateral interval, protect at tuberosity | Primary repair or observe, AFO if deficit ||

Post-operative Complications:

|| Complication | Incidence | Prevention | Treatment || ||--------------|-----------|------------|-----------|| || Anterior scarring / flexion contracture | 10-20% | Layered closure, early motion | Physiotherapy, possible re-release || || Wound dehiscence / necrosis | 3-5% | Avoid tight closure, meticulous haemostasis | Wound care, possible skin graft || || Median nerve neurapraxia | 2-5% | Careful retraction | Observe, most recover in 3-6 months || || PIN palsy | 1-3% | Protect during tuberosity work | AFO, observe, explore if no recovery || || Infection | 1-2% | Prophylactic antibiotics, sterile technique | Irrigation and debridement, antibiotics || || Heterotopic ossification | 5-10% | Early motion, consider prophylaxis in high-risk | Excision if symptomatic after maturation ||

Immediate Post-operative:

• Neurovascular check documenting median nerve function (thumb opposition, index finger flexion) and radial nerve function (wrist and finger extension)
• Wound inspection
• Posterior splint or hinged elbow brace locked at 90 degrees
• Elevate limb above heart level

Range of Motion Protocol:

• Days 0-7: Immobilisation in 90-degree splint for comfort
• Week 1-6: Begin gentle active-assisted range of motion, aim for 30-120 degrees by 6 weeks
• Week 6+: Progressive strengthening, full range of motion
• For distal biceps repair: protect against active supination and heavy lifting for 8-12 weeks

Follow-up Schedule:

• 2 weeks: Wound check, suture removal
• 6 weeks: Radiographs if needed, assess healing, progress ROM
• 12 weeks: Functional assessment, return to light activities
• 6 months: Final clinical review, assess for contracture

DVT Prophylaxis:

• LMWH or aspirin per institutional protocol for patients with additional risk factors
• Early mobilisation is the primary prophylaxis

The anterior elbow approach is used worldwide for distal biceps repair, anterior capsular release, and neurovascular exploration. Principles are consistent across examination systems (FRCS, FRACS, EBOT, ABOS). The lazy-S incision, early identification of the brachial artery and median nerve, and protection of the lateral antebrachial cutaneous nerve and PIN are universal requirements.

Side-by-side principles (where guidance converges):

|| Body | Position on anterior elbow approach || ||------|----------------------------------|| || AO Foundation / OTA | Lazy-S incision recommended, brachial artery and median nerve identified early, PIN protection mandatory during distal biceps work, early motion to prevent scarring || || BOA / BESS (UK) | Single-incision anterior approach acceptable, two-incision technique reduces PIN risk, consent must include nerve injury and scarring risks || || AAOS / ASSH | Anatomic reattachment of distal biceps to posterior tuberosity, anterior capsular release effective for stiffness, neurovascular structures protected throughout ||

Registry / population evidence:

• Distal biceps rupture incidence is approximately 1.5-5.4 per 100,000 person-years, predominantly in men aged 40-60.
• Single-incision repair is the most common technique globally, with PIN injury rates of 1-3% and anterior scarring rates of 10-20%.
• Early motion protocols reduce the incidence of post-operative stiffness.

Global practice variation: In high-resource settings, cortical button and suture anchor fixation are standard for distal biceps repair. In resource-limited settings, transosseous tunnels remain widely used. The anterior approach is the default exposure for capsular release and vascular exploration worldwide.

Consent (globally applicable): discuss brachial artery injury (less than 1%), median nerve injury (2-5%, mostly transient), lateral antebrachial cutaneous nerve injury (5-15%, often permanent numbness), PIN injury (1-3%), anterior scarring and flexion contracture (10-20%), infection (1-2%), and the possibility of incomplete recovery of motion or strength.