Minimum 5-year Follow-up Results of Minimally Invasive Total Knee Arthroplasty Using Mini-Keel Modular Tibial Implant.

Ju-Hyung Yoo,Hyun-Cheol Oh,Byoung-Kyu Park,Sang-Hoon Park,Chang-Dong Han

doi:10.5792/ksrr.2014.26.3.149

Abstract

PurposeTo evaluate the minimum 5-year mid-term clinical and radiological results of minimally invasive surgery total knee arthroplasty (MIS-TKA) using a mini-keel modular tibia component.Materials and MethodsWe retrospectively evaluated 254 patients (361 cases) who underwent MIS-TKA between 2005 and 2006. The latest clinical and radiological assessments were done in 168 cases that had been followed on an outpatient basis for more than 5 postoperative years. Clinical results were assessed using the Hospital for Special Surgery (HSS) score and Knee Society score. Radiological evaluation included measurements of knee alignment.ResultsThe average postoperative knee range of motion and HSS score were 134.3°±12.4° and 92.7°±7.0°, respectively. The average postoperative femorotibial angle and tibial component alignment angle were 5.2°±1.7° valgus and 90.2°±1.6°, respectively. The average tibial component posterior inclination was 4.8°±2.1°. The percentage of cases with tibial component alignment angle of 90°±3° was 96.1%, and that with the femorotibial angle of 6°±3° valgus was 94.0%. Radiolucent lines were observed in 20 cases (12.0%): around the femur, tibia, and patella in 14 cases, 10 cases, and 1 case, respectively. However, they were less than 2 mm and non-progressive in all cases. The survival rate was 99.4% and there was no implant-related revision.ConclusionsMIS-TKA using a mini-keel modular tibial plate showed satisfactory results, a high survival rate, and excellent clinical and radiological results in the mid-term follow-up.

Highlights

Ment of a retractor to secure an adequate field of view; extension/ flexion or medial/lateral rotation of the knee joint during surgery; and, above all, continuous development of surgical techniques and cooperation of the members of a surgical team1-5)
The mini-keel modular tibial implant (Nexgen MIS Tibial Component; Zimmer Inc., Warsaw, IN, USA) is one of those inventions that can be inserted into the knee in flexed position without anterior dislocation of the knee joint due to the presence of a short keel in the tibial component (Fig. 1)6)
361 TKAs were performed via minimally invasive approach in 254 patients, and surgical outcomes and intraoperative complications were investigated among these patients

Summary

Introduction

Invasive surgery total knee arthroplasty (MIS-TKA) requires downsizing or modification of surgical equipment due to the small field of view; medial/lateral or proximal/distal move-. The purpose of this study was to evaluate the efficacy and longevity of the mini-keel modular tibial implant in MIS-TKA based on a retrospective review of clinical and radiological findings. The mini-keel modular tibial implant (Nexgen MIS Tibial Component; Zimmer Inc., Warsaw, IN, USA) is one of those inventions that can be inserted into the knee in flexed position without anterior dislocation of the knee joint due to the presence of a short keel in the tibial component (Fig. 1)[6]).

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Conclusion