- >30° radial instability indicates complete ligamentous injury and generally requires surgery.
- Compare laxity to the uninjured side.
- Stable bony UCL avulsion injuries heal well with immobilization.
- A Stener Lesion occurs when the UCL tendon tears and then flips over the aponeurosis of the adductor pollicis muscle. This disrupts the ability of the tendon to heal without surgery.