Knee Surg Relat Res.  2014 Sep;26(3):149-154. 10.5792/ksrr.2014.26.3.149.

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

• Yoo JH
• Park BK
• Han CD
• Oh HC
• Park SH

• KMID: 2223270
• DOI: http://doi.org/10.5792/ksrr.2014.26.3.149

Abstract

PURPOSE
To 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 METHODS
We 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.
RESULTS
The average postoperative knee range of motion and HSS score were 134.3degrees+/-12.4degrees and 92.7degrees+/-7.0degrees, respectively. The average postoperative femorotibial angle and tibial component alignment angle were 5.2degrees+/-1.7degrees valgus and 90.2degrees+/-1.6degrees, respectively. The average tibial component posterior inclination was 4.8degrees+/-2.1degrees. The percentage of cases with tibial component alignment angle of 90degrees+/-3degrees was 96.1%, and that with the femorotibial angle of 6degrees+/-3degrees 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.
CONCLUSIONS
MIS-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.

Keyword

Knee; Arthroplasty; Minimally invasive; Mini-keel tibial component

MeSH Terms

Arthroplasty*
Femur
Follow-Up Studies*
Humans
Knee*
Outpatients
Patella
Range of Motion, Articular
Retrospective Studies
Surgical Procedures, Minimally Invasive
Survival Rate
Tibia