Innervation of the Elbow Joint: A Cadaveric Study

Area of Science:

• Anatomy
• Neuroscience
• Orthopedics

Background:

• Elbow joint innervation is complex and crucial for understanding its biomechanics and surgical interventions.
• Detailed anatomical knowledge of peripheral nerve contributions to the elbow capsule is essential for accurate surgical planning and treatment.

Purpose of the Study:

• To meticulously describe the innervation patterns of the elbow joint capsule.
• To identify specific nerves and their branches supplying different regions of the elbow capsule.

Main Methods:

• Dissection of 15 fresh-frozen cadaveric upper extremities under loupe magnification.
• Systematic exploration of median, radial, musculocutaneous, and ulnar nerves around the elbow joint.
• Identification and documentation of capsular branches and anatomical patterns.

Main Results:

• The ulnar nerve provided an average of 1.5 branches to the articular surface in 11 specimens.
• The radial nerve supplied the posterolateral capsule (10 cases) and anterolateral capsule (12 cases).
• The musculocutaneous nerve innervated the anterior capsule (10/13 specimens), while the median nerve had minimal contribution.

Conclusions:

• The anterior elbow capsule is predominantly innervated by the radial and musculocutaneous nerves.
• The posterior capsule receives innervation from the ulnar (posteromedial) and radial (posterolateral) nerves.
• Precise understanding of elbow innervation is vital for advancing denervation studies and surgical techniques.