Computerized tomography based“patient specific blocks”improve postoperative mechanical alignment in primary total knee arthroplasty

• 作者: Amit K Agarwal Raju Vaishya Vikas P Birla Vipul Vijay
• 来源期刊: 世界骨科杂志
• 学科: 医学
• 关键词: KNEE REPLACEMENT ARTHROPLASTY Patient SPECIFIC jigs Conventional jigs
• 年，卷（期）: 2016,（7）
• 页码范围: 426-433
• 页数: 8页
• 分类号: R783.5

摘要

AIM:To compare the postoperative mechanical alignment achieved after total knee arthroplasty(TKA)using computer tomography(CT)based patient specific blocks(PSB)to conventional instruments(CI).METHODS:Total 80 knees were included in the study,with 40 knees in both the groups operated using PSB and CI.All the knees were performed by a single surgeon using the same cruciate sacrificing implants.In our study we used CT based PSB to compare with CI.Postoperative mechanical femoro-tibial angle(MFT angle)was measured on long leg x-rays using picture archiving and communication system(PACS).We compared mechanical alignment achieved using PSB and CI in TKA using statistical analysis.RESULTS:The PSB group(group 1)included 17 females and seven males while in CI group(group 2)there were 15 females and eight males.The mean age of patients in group 1 was 60.5 years and in group 2 it was 60.2 years.The mean postoperative MFT angle measured on long-leg radiographs in group 1 was 178.23°(SD=2.67°,range:171.9°to 182.5°)while in group 2,the mean MFT angle was 175.73°(SD=3.62°,range:166.0°to 179.8°).There was significant improvement in postoperative mechanical alignment(P value=0.001),in PSB group compared to CI.Number of outliers were also found to be less in group operated with PSB(7 Knee)compared to those operated with CI(17 Knee).CONCLUSION:PSB improve mechanical alignment after total knee arthroplasty,compared to CI.This may lead to lower rates of revision in the PSB based TKA as compared to the conventional instrumentation.