Abstract
Purpose
The purpose of this study was to compare the clinical and radiological results after total knee arthroplasty(TKA) with PCL sacrificing (PCS) Medial Pivot Knee (MPK) and PCL Substituting (PS) Nexgen® LPS.
Materials and Methods
One hundred twenty knees in 80 patients after TKA with PCS ADVANCE® MPK (Group I) and 116 knees in 85 patients with PS Nexgen® LPS (Group II) were retrospectively evaluated. All the patients were followed up for more than 6 years. The evaluations included preoperative and postoperative range of motion (ROM), tibiofemoral angle, Knee Society (KS) knee and function score, Hospital for Special Surgery (HSS) knee score, WOMAC score and postoperative complications.
Results
For group I, the ROM increased from a mean flexion contracture of 7.6° and further flexion of 115.1° to 1.3° and 120.5° respectively and for group II, from 9.4° and 124.8° to 1.3° and 129.7°, respectively. For group I, KS knee and function scores increased from 46 and 38 to 87 and 82 respectively, and for group II, from 49 and 43 to 88 and 81, respectively. Hospital for Special Surgery (HSS) knee score improved from preoperatively 48.3 to postoperatively 84.2 for group I and 44.6 to 82.3 for group II. WOMAC score was improved preoperatively 54.8 to postoperatively 18.3 for group I and 57.4 to 17.4 for group II. For group I, tibiofemoral angle changed from varus 4.6° to valgus 5.8° and for group II, from varus 5.8° to valgus 5.2°. The complications were 2 cases(1.7%) of periprosthetic patellar fracture and 1 case(0.8%) of early failure of the tibial component and 1 case(0.8%) of osteolysis and loosening in group I, and 1 knee (1.0%) with early femoral component failure and 1 knee with arthrofibrosis (1.0%) in group II.
Conclusion
The minimum 6-year follow-up results of PCS ADVANCE® MPK TKA without box cut were comparable to those of PS Nexgen®LPS.
