Gait analysis of patients with resurfacing hip arthroplasty compared with metal-on-metal bigfemo-ral-head tot ip psy

陳云蘇(Chen Yunsu，Dept Orthop Surg，6th Affil Peop Hosp，Shanghai Jiaotong Univ，Shanghai 200233)…∥Chin J Orthop.－ 2010，30(11).－ 1116～1120

Gait analysis of patients with resurfacing hip arthroplasty compared with metal-on-metal bigfemo-ral-head tot ip psy

陳云蘇(Chen Yunsu，Dept Orthop Surg，6th Affil Peop Hosp，Shanghai Jiaotong Univ，Shanghai 200233)…∥Chin J Orthop.－ 2010，30(11).－ 1116～1120

ObjectiveTo compare gait patterns in patients with metal-on-metal resurfacing hip arthroplasty(RHA)and big-femoral-head total hip arthroplasty(BHA)at one year postoperatively.MethodsFrom June 2006 to March 2009，two groups of 30 RHA and BHA patients participated in the study.Gait parameters，knee and hip joint range of motions(ROMs)in gait cycles were measured at one year postoperatively by Vicon gait analysis system，and the values were used to calculate affected/unaffected ratios of patients themselves.ResultsNo significant difference were found in affected/unaffected ratios of cadence，single limb support time，foot off，peak value of vertical ground reaction force，the hospital for special surgery score and the university of California at Los Angeles activity assessment between the two groups.However，severalROM affected/unaffected ratios in RHA group(hip range of flexion/extension，abduction/adduction，and rotation were 1.0323，0.9747，and 1.0558，respectively.The knee range of flexion/extension for affected/unaffected ratios was 1.0027)were significantly higher than those in BHA group(the corresponding values were 0.8615，0.7824，0.8162，0.9472，respectively).The P values were 0.007，0.005，0.006，and 0.037，respectively.Conclusion(1)Gait parameters of patients who underwent RHA and BHA were close to normal values at one year postoperatively.(2)At the follow up time point，joint ROMs of RHA patients are larger than those of BHA patients during gait cycle.(3)RHA can retain enough bone stock for future revision option，moreover，it can achieve maximum recovery of joint function.13 refs，6 figs，3 tabs.

(Authors)