Investigating the Function and stability of intra-osseous the Distal Radius Ulnar Joint prosthesis on cadavers

BackhroundsOne of the common injuries in the distal radius-ulnar joint is arthritis in this area. Manyprostheses have been made for the radioulnar joint, but none have an acceptableperformance, since two parts of prostheses are not placed in the bone. We have designed a prosthesis that is replace with a distal segment of the bone. This prosthesisis drive from the Kapandji method, which is a common surgical method. In this study,we are going to test the prosthesis on the corpusMethodsIn this study, we investigated the stability and biomechanics of artificial intra-osseousDistal Radius Ulnar Joint prosthesis on 4 corpses. The range of wrist movements wasrecorded in six directions before and after the operation. Artificial wrist stability testswere performed as side tensile tests in three modes (Supination, neutral and pronation),axial loading, and rotational loading in supination and pronation for artificial jointstability. Ultimately, anteroposterior and lateral radiographs were performed.ResultsAll 4 prostheses were placed without problems. The range of motion of the wrist didnot changed before and after placement. The results of lateral traction tests wereapplied in three modes (supernatant and permeation) of the axial stretching, andlateral traction in supination and pronation demonstrated complete joint stability inall four patients. The amount of torque in supination in three patients was 8 ,4 and7.2 N/m, respectively, and 7 ,4, and 8, respectively in pronation. We had prosthesisfailure only in one case. The amount of displacement of the removed segment in thepronation and supination has been at most 2 mm.ConclusionsIntra-osseous Distal Radius Ulnar Joint artificial prosthesis presented proper functionon cadaver study.