A Comparison of the Short-term Results between the PCL Sacrificing Medial Pivot Knee and Nexgen(R) LPS Total Knee Arthroplasty

ABSTRACT

PURPOSE: We wanted to compare the clinical and radiological results after performing total knee arthroplasty (TKA) with the PCL sacrificing (PS) Medial Pivot Knee (MPK) and the Nexgen(R) LPS. MATERIALS AND METHODS: Seventy knees in 48 patients after TKA with the PS ADVANCE(R) MPK (group I) and 67 knees in 45 patients with the Nexgen(R) LPS (group II) were retrospectively evaluated. All the patients were followed up for more than 2 years. The evaluations included the preoperative and postoperative range of motion (ROM), the Knee Society (KS) scores, the tibiofemoral angle and the postoperative complications. RESULTS: For group I, the ROM increased from a mean flexion contracture of 6.3degrees and further flexion of 116.4degrees to 1.9degrees and 120.5degrees, respectively, and for group II, from 12.6degrees and 117.6degrees to 0.9degrees and 123.0degrees, respectively. For group I, the KS knee and function scores increased from 46 and 37 to 87 and 83, respectively, and for group II, from 50 and 48 to 87 and 83, respectively. For group I, the tibiofemoral angle changed from varus 4.0degrees to valgus 5.5degrees, respectively, and for group II, from varus 4.1degrees to valgus 5.3degrees, respectively. The complications were 2 knees (2.8%) with periprosthetic patellar fractures and 1 knee (1.4%) with a tibial component failure in group I, and 1 knee (1.5%) with early femoral component failure and 1 knee with arthrofibrosis (1.5%) in group II. CONCLUSION: The minimum 2-year follow-up results of PS MPK TKA were comparable to those of Nexgen(R) LPS TKA. However, we think that the MPK system has the advantage of more bony preservation at the femoral intercondylar notch area.