Olecranon Posterior Capsular Attachment

insertio capsularis posterior olecrani

The posterior elbow capsule attaches to the proximal olecranon, forming the posterior restraint against elbow hyperextension and the posterior boundary of the olecranon fossa.

Region: Upper Arm

Biomechanics

Function & Actions

Resists excessive elbow extension, defines the posterior joint boundary, and is the structure disrupted in posterior elbow dislocation along with the lateral ligament complex.

Clinical Relevance

Clinical Notes

The posterior capsule is the first structure to fail in posterior elbow dislocation — it tears from the olecranon as the joint dislocates. In elbow contracture release, the posterior capsule is excised arthroscopically or open to gain terminal extension. Posterior capsular calcification produces posterior elbow pain and limited extension.

Pathology

Common Injuries & Conditions

Posterior Capsule Failure in Elbow Dislocation

Posterior capsular avulsion from the olecranon in posterior elbow dislocation, repaired only when persistent instability remains after reduction and ligament reconstruction.

Posterior Capsulectomy for Extension Contracture

Arthroscopic or open resection of the posterior elbow capsule in post-traumatic flexion contracture producing extension loss, restoring terminal extension range.