Yadav Basavaraj, Shaw David, Radcliffe Graham, Dachepalli Sunil, Kluge Wolfram
Bradford Royal Infirmary, Duckworth lane, Bradford, United Kingdom.
J Orthop Surg (Hong Kong). 2012 Dec;20(3):348-52. doi: 10.1177/230949901202000317.
To report the short-term outcome of the low contact stress (LCS) patellofemoral prosthesis in 51 knees.
12 men and 37 women aged 23 to 79 (mean, 53.4) years underwent 51 consecutive LCS patellofemoral replacements. All patients had symptomatic isolated arthritis in the patellofemoral joint with well-preserved tibiofemoral compartments. All knees were evaluated pre- and post-operatively. The new Oxford scoring system was used. Anteroposterior, lateral, and skyline weight-bearing radiographs were reviewed.
The mean follow-up period was 4.2 years; no patient was lost to follow-up. The mean new Oxford Knee score was 13.9 preoperatively and improved by 13.7 at 3 months (p<0.001) and by further 7.1 at 12 months (p<0.001). Any change after 12 months was not significant (p=0.73). 18 of the knees developed patellar maltracking and resulted in subluxation and lateral tilt of the patella with severe polyethylene wear. 10 (20%) of the knees were revised; 8 with patellar maltracking were revised to total knee arthroplasty (n=3) or patellofemoral arthroplasty with a different implant (n=5), whereas 2 with disease progression were revised to total knee arthroplasty. The estimated survival rate of the prosthesis was 73% at 4.5 years and 48% at 5.5 years.
The revision rate for the LCS patellofemoral prosthesis was high (20%).
报告51例膝关节低接触应力（LCS）髌股关节假体的短期疗效。
12名男性和37名女性，年龄23至79岁（平均53.4岁），连续接受了51例LCS髌股关节置换术。所有患者均患有症状性孤立性髌股关节关节炎，胫股关节间隙保存良好。所有膝关节均在术前和术后进行评估。采用新牛津评分系统。回顾前后位、侧位和髌股关节负重位X线片。
平均随访期为4.2年；无患者失访。术前新牛津膝关节平均评分为13.9分，3个月时提高了13.7分（p<0.001），12个月时进一步提高了7.1分（p<0.001）。12个月后任何变化均无统计学意义（p=0.73）。18例膝关节出现髌骨轨迹不良，导致髌骨半脱位和外侧倾斜，并伴有严重的聚乙烯磨损。10例（20%）膝关节进行了翻修；8例因髌骨轨迹不良翻修为全膝关节置换术（n=3）或使用不同植入物的髌股关节置换术（n=5），而2例因疾病进展翻修为全膝关节置换术。假体4.5年的估计生存率为73%，5.5年为48%。
LCS髌股关节假体的翻修率较高（20%）。
