Cho Kye-Youl, Kim Kang-Il, Song Sang-Jun, Kim Kyu-Jin
Department of Medicine, Graduate School, Kyung Hee University, Seoul, Korea.
Department of Orthopaedic Surgery, Center for Joint Diseases and Rheumatism, Kyung Hee University Hospital at Gangdong, Seoul, Korea.
Knee Surg Relat Res. 2018 Mar 1;30(1):23-27. doi: 10.5792/ksrr.17.042.
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.
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.
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.
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.
本研究的目的是确定在需要高屈曲度的患者中，股骨部件屈曲角度有意增加的活动平台单髁膝关节置换术（UKA）的结果。
我们调查了45例接受UKA治疗的膝关节。临床上，我们在术前和最终随访时测量了活动范围（ROM）和美国膝关节协会（AKS）评分，并调查了并发症。放射学上，我们测量了术后股骨部件的屈曲角度、胫骨部件的后倾角度、股胫角和肢体的机械轴。
ROM从术前的123°增加到最终随访时的139°。AKS膝关节和功能评分分别从术前的59分和68分增加到最终随访时的94分和96分。股骨部件的屈曲角度为9.1°，胫骨部件的后倾角度为8.6°。在最大股骨屈曲角度的病例中有1例发生了轴承脱位。
结果可能反映了在活动平台UKA中，股骨部件屈曲角度增加至10°对ROM的积极影响，这将有助于UKA术后提高生活质量，尤其是在需要深度屈膝的人群中。
