Distal Humerus – Lateral Approach

Modern Study Review (AI-Generated)

High-Yield Summary

The lateral approach to the distal humerus is a reliable surgical corridor primarily indicated for extra-articular distal humerus fractures and limited articular exposure. It offers direct access to the lateral column and capitellum with minimal soft tissue disruption. While the posterior approach remains the gold standard for complex intra-articular fractures, the lateral approach is preferred for isolated lateral column injuries and select percutaneous fixation techniques.

Applied Anatomy & Intervals

Internervous Interval

• Between the radial nerve (posterior compartment) and the musculocutaneous nerve (anterior compartment).
• Proximally: plane between brachioradialis (radial nerve innervated) and triceps brachii (radial nerve innervated).
• Distally: plane between brachialis (musculocutaneous nerve innervated) and brachioradialis.

Anatomic Landmarks

• Lateral epicondyle of the humerus (palpable)
• Radial head (radiographically visible)
• Lateral supracondylar ridge

Patient Positioning & Setup

• Table Type: Radiolucent operating table to facilitate intraoperative fluoroscopy.
• Patient Position: Supine with the arm on a radiolucent hand table or lateral decubitus with arm supported; supine is most common.
• Specialized Equipment:
• Arm holder or limb positioner to maintain elbow flexion and forearm rotation.
• C-arm positioned laterally for unobstructed fluoroscopic imaging.

Surgical Technique (The “Vital Steps”)

Incision & Superficial Dissection

• Longitudinal skin incision centered over the lateral epicondyle, extending proximally along the lateral supracondylar ridge.
• Identify and protect the lateral cutaneous nerve of the forearm.
• Incise fascia overlying the brachioradialis and extensor carpi radialis longus muscles.

Deep Dissection & Exposure

• Identify and protect the radial nerve as it crosses from posterior to anterior in the spiral groove.
• Elevate the brachioradialis and extensor carpi radialis longus anteriorly to expose the lateral column.
• Retract the triceps posteriorly.
• For articular exposure, perform a limited lateral capsulotomy or use the Kocher interval (between anconeus and extensor carpi ulnaris) if needed.

The “Danger Zone”

Post-Operative Pearl

Early elbow mobilization is encouraged to prevent stiffness; avoid aggressive extension or varus stress for 4-6 weeks to protect lateral column fixation and soft tissues.

Classic Clinical Notes

Distal humerus – lateral approach

Last Updated on January 25, 2026 by orthonet