POSTEROLATERAL IMPINGEMENT

Also called valgus extension overload syndrome This is not the same as posterolateral rotatory instability… … Which is due to a tear of the lateral ulnar collateral ligament Posterolateral impingement refers to impingement between the olecranon articular surface on the lateral side and the opposing capitellar surface

Said to be the result of abnormal olecranon lateral movement Itself secondary to ligament laxity from previous trauma The imaging signs are often subtle Chondromalacia may be difficult to see

Diagnosis becomes a little easier when there is subchondral bone oedema.

A secondary synovitis and marginal osteophyte formation around the articulation are also important findings