What is the function of the common flexor tendon in relation to the elbow?

The common flexor tendon plays a critical role in the function of the elbow by attaching to several muscles that contribute to flexion of the forearm. In addition to facilitating this primary movement, it provides significant stability to the elbow joint, specifically during movements that involve a valgus (lateral) force.

As the muscles originating from the common flexor tendon—including the flexor carpi radialis, flexor carpi ulnaris, and others—contract, they help resist forces that might otherwise push the forearm outward relative to the upper arm. This stabilization is particularly important during activities that require pushing or throwing, where excessive valgus stress can lead to injuries, such as ulnar collateral ligament injuries.

The other functions described in the options encompass different roles of the elbow and forearm musculature but are not directly associated with the primary role of the common flexor tendon.