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In 75% of patients younger than 20 years old, PLRI is the result of an elbow dislocation that injures the LCL complex. In adults, PLRI is more commonly caused by a varus extension stress to the elbow without dislocation, often initially diagnosed as a sprain.
Posterolateral rotatory instability, abbreviated as PLRI is the most commonly encountered pattern of elbow instability. PLRI typically occurs as a result of a fall on the outstretched arm, generating an axial load, valgus force and an external rotational movement (torque) about the forearm with respect to the humerus.
Milking Maneuver is a elbow ligamentous injury test which evaluates the anterior and posterior bundle of the ulnar collateral ligament (Valgus instability).[1][2][3][4]
The Tabletop Relocation Test of the elbow assesses for posterolateral rotatory instability of the elbow, abbreviated as PLRI.
This article reviews the elbow’s unique anatomy and biomechanical characteristics and these are applied when reviewing the maneuvers and testing used to diagnose elbow instability. Keywords: Valgus instability, posterolateral rotatory instability, varus posteromedial rotatory instability, elbow biomechanics
The chair push-up test, also known as stand-up test or chair sign, is used to test for the posterolateral rotatory instability (PLRI) of the elbow joint and the evaluation of its lateral collateral ligament.
Recurrent elbow instability may cause pain, locking, catching, or clicking of the elbow. You may also have a sense of the elbow feeling like it might pop out of place. This feeling commonly occurs while pushing off from a chair, specifically with posterolateral rotatory instability.
