Arm – Anterior Approach

Modern Study Review (AI-Generated)

High-Yield Summary

The Anterior Approach to the Arm is a versatile and widely accepted surgical corridor primarily used for open fixation of humeral shaft fractures, neurovascular exploration, and anterior compartment soft tissue procedures. It utilizes the internervous plane between the musculocutaneous nerve and the radial nerve, allowing safe access to the mid and distal humerus. This approach remains a gold standard for many surgeons, although minimally invasive and posterior approaches are increasingly employed based on fracture characteristics and surgeon preference.

Applied Anatomy & Intervals

Internervous Interval

Between the musculocutaneous nerve (innervating biceps brachii and brachialis) and the radial nerve (innervating triceps and brachioradialis). This plane permits safe dissection without denervating key muscle groups.

Anatomic Landmarks

• Medial and lateral borders of the biceps brachii muscle
• Coracobrachialis muscle proximally
• Bicipital groove (palpable)
• Medial and lateral epicondyles distally for orientation

Patient Positioning & Setup

Table Type

Standard operating table with radiolucent capabilities for intraoperative fluoroscopy.

Patient Position

Supine with the arm abducted on an arm board or placed on a padded hand table. The shoulder is externally rotated to optimize anterior arm exposure.

Specialized Equipment

• Arm positioner or padded hand table to maintain stable arm positioning
• C-arm fluoroscopy positioned laterally or from the head of the bed for imaging

Surgical Technique (The “Vital Steps”)

Incision & Superficial Dissection

• Longitudinal incision centered over the biceps brachii, extending from the deltopectoral groove proximally to the antecubital fossa distally.
• Identify and protect the cephalic vein superficially.
• Retract the biceps medially or laterally depending on the surgical target zone.

Deep Dissection & Exposure

• Identify the musculocutaneous nerve as it pierces the coracobrachialis proximally.
• Retract the biceps and brachialis muscles to expose the humeral shaft.
• Identify and protect the radial nerve as it courses from posterior to anterior in the distal third of the arm, typically within the lateral intermuscular septum.
• Perform fracture reduction or implant placement under direct visualization and fluoroscopic guidance.

The “Danger Zone”

Post-Operative Pearl

Early passive and active range of motion of the elbow is encouraged to prevent stiffness. However, resisted elbow flexion should be delayed until soft tissue healing is adequate, typically 2–3 weeks postoperatively.

Classic Clinical Notes

Arm – anterior approach

• position
• landmarks
• incision
• internervous plane
• superficial dissection
• deep dissection
• dangers

Last Updated on January 25, 2026 by orthonet