- Discussion: - unicompartmental arthroplasty serves a specific nitch for knees that are too severe for arthroscopic management of medial DJD (see mosaicplasty) but are not severe enough for total knee replacement; - Technical Goals: - balance the flexion and extension gaps; - balance the medial and lateral compartments (in flexion and extension) - references: - Alignment Influences Wear in the Knee after Medial Unicompartmental Arthroplasty. - Unicompartmental knee arthroplasty for DJD of the knee. Remaining postoperative flexion contracture affecting overall results. - Lateral tibiofemoral compartment narrowing after medial unicondylar arthroplasty. - Alignment influences wear in the knee after medial unicompartmental arthroplasty. - tibial component: - many systems base alignment of the femoral component off of the tibial component; - tibial component must be aligned in the true AP plane (no internal rotation, no varus); - references: - Stress fracture of the medial tibial plateau after minimally invasive unicompartmental knee arthroplasty. A Report of 2 Cases - Rapid Poly Failure of Unicondylar Tibial Components Sterilized w/ Gamma Irradiation in Air and Implanted After a Long Shelf Life. - Posterior Slope of the Tibial Implant and the Outcome of Unicompartmental Knee Arthroplasty. - Influence of the tibial slope on tibial translation and mobility of non-constrained total knee prosthesis - Patient, implant, and alignment factors associated with revision of medial compartment unicondylar arthroplasty. - Proximal tibial meniscal slope: a comparison with the bone slope - femoral component: - must be positioned on adequate base of bleeding subchondral bone; - potential conflict in need to mill deep enough to get down to subchondral bone, while maintaining flexion and extension balance; - must be position anterior enough for adequate coverage in full extension, while avoiding patellar impingement; - must be centered over native anatomy of the medial femoral condyle; - must have maximal congruent contact with tibial component in full flexion and extension; - references: - Influence of rotatory malposition of femoral implant in failure of unicompartimental medial knee prosthesis - Patellar Impingement Following Unicompartmental Arthroplasty. - Relative positions of the contacts on the cartilage surfaces of the knee joint - The influence of presence and severity of pre-existing patellofemoral degenerative changes on outcome of Oxford medial UKR. - cement technique: - Posteromedial compartment cement extrusion after unicompartmental knee arthroplasty treated by arthroscopy: a case report.
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