Isolated ligamentous injury can cause posteromedial elbow instability: a cadaveric study

Sectioning of the pMUCL results in significant increases in torsion and displacement about the proximal ulnohumeral joint. Our findings demonstrate that elbow PMRI can occur secondary to isolated ligamentous injury. Clinicians mindful of this previously unrecognized role of the pMUCL as a stabilizer may wish to consider methods of restoring pMUCL integrity when treating medial elbow instability.