Intentionally Increased Flexion Angle of the Femoral Component in Mobile Bearing Unicompartmental Knee Arthroplasty

다국어 초록 (Multilingual Abstract)

Purpose: The purpose of this study was to determine the results of mobile bearing unicompartmental knee arthroplasty (UKA) with an intentionally increased flexion angle of the femoral component in patients requiring high flexion.
Materials and Methods: We investigated 45 knees treated by UKA. Clinically, we measured the range of motion (ROM) and the American Knee Society (AKS) score preoperatively and at final follow-up and investigated complications. Radiologically, we measured the flexion angle of the femoral component, the posterior slope angle of the tibial component, the femorotibial angle and mechanical axis of the limb postoperatively.
Results: The ROM was increased from 123° preoperatively to 139° at the final follow-up. The AKS knee and function scores increased from 59 and 68, respectively, preoperatively to 94 and 96, respectively, at the final follow-up. The flexion angle of the femoral component was 9.1°, and the posterior slope angle of the tibial component was 8.6°. There was one case of bearing dislocation in the largest femoral flexion angle case.
Conclusions: The results might reflect the positive effect of an increased flexion angle of the femoral component up to 10° on ROM in mobile bearing UKA, which would contribute to better quality of life after UKA especially in populations requiring deep knee flexion.

참고문헌 (Reference)

1 Newman J, "Unicompartmental or total knee replacement: the 15-year results of a prospective randomised controlled trial" 91 : 52-57, 2009

2 Cartier P, "Unicompartmental knee arthroplasty surgery. 10-year minimum follow-up period" 11 : 782-788, 1996

3 Kim JG, "The radiological parameters correlated with the alignment of the femoral component after Oxford phase 3 unicompartmental knee replacement" 94 : 1499-1505, 2012

4 White SH, "The Twin Peg Oxford partial knee replacement: the first 100 cases" 19 : 36-40, 2012

5 Vorlat P, "The Oxford unicompartmental knee prosthesis: an independent 10- year survival analysis" 14 : 40-45, 2006

6 Pandit H, "The Oxford medial unicompartmental knee replacement using a minimally-invasive approach" 88 : 54-60, 2006

7 Murray DW, "The Oxford medial unicompartmental arthroplasty: a ten-year survival study" 80 : 983-989, 1998

8 Kaya Bicer E, "Sagittal flexion angle of the femoral component in unicompartmental knee arthroplasty: is it same for both medial and lateral UKAs" 18 : 928-933, 2010

9 Price AJ, "Rapid recovery after oxford unicompartmental arthroplasty through a short incision" 16 : 970-976, 2001

10 Lim HC, "Oxford phase 3 unicompartmental knee replacement in Korean patients" 94 : 1071-1076, 2012

11 Lewold S, "Oxford meniscal bearing knee versus the Marmor knee in unicompartmental arthroplasty for arthrosis: a Swedish multicenter survival study" 10 : 722-731, 1995

12 Murray DW, "Mobile bearing unicompartmental knee replacement" 28 : 985-987, 2005

13 Rees JL, "Minimally invasive Oxford unicompartmental knee arthroplasty: functional results at 1 year and the effect of surgical inexperience" 11 : 363-367, 2004

14 Pandit H, "Minimally invasive Oxford phase 3 unicompartmental knee replacement: results of 1000 cases" 93 : 198-204, 2011

15 Won-Sik Choy, "Mid-Term Results of Oxford Medial Unicompartmental Knee Arthroplasty" 대한정형외과학회 3 (3): 178-183, 2011

16 Kurosaka M, "Maximizing flexion after total knee arthroplasty: the need and the pitfalls" 17 (17): 59-62, 2002

17 Price AJ, "Long-term clinical results of the medial Oxford unicompartmental knee arthroplasty" (435) : 171-180, 2005

18 Miner AL, "Knee range of motion after total knee arthroplasty: how important is this as an outcome measure?" 18 : 286-294, 2003

19 Gulati A, "Influence of component alignment on outcome for unicompartmental knee replacement" 16 : 196-199, 2009

20 Kim SJ, "Factors affecting the postoperative limb alignment and clinical outcome after Oxford unicompartmental knee arthroplasty" 27 : 1210-1215, 2012

21 Ueo T, "Deep flexion-oriented bisurface-type knee joint and its tibial rotation that attributes its high performance of flexion" 26 : 476-482, 2011

22 Clarius M, "Correlation of positioning and clinical results in Oxford UKA" 34 : 1145-1151, 2010

23 Shakespeare D, "Accuracy of implantation of components in the Oxford knee using the minimally invasive approach" 12 : 405-409, 2005

24 Kim KT, "A prospective analysis of Oxford phase 3 unicompartmental knee arthroplasty" 30 (30): 15-18, 2007

25 Bert JM, "10-year survivorship of metal-backed, unicompartmental arthroplasty" 13 : 901-905, 1998