English to Chinese Medical Medical (general) joint replacement 关节置换

In a systematic review, reports from national registers and clinical studies were identified and analysed with respect to revision rates after joint replacement, which were calculated as revisions per 100 observed component years. After primary hip replacement, a mean of 1.29 revisions per 100 observed component years was seen. The results after primary total knee replacement are 1.26 revisions per 100 observed component years, and 1.53 after medial unicompartmental replacement. After total ankle replacement a mean of 3.29 revisions per 100 observed component years was seen. The outcomes of total hip and knee replacement are almost identical. Revision rates of about 6% after five years and 12% after ten years are to be expected.
大概是关节置换术后的翻新吧，我也不知道有没有翻新这个词。revisions per 100 observed component years翻修次数/观察假体100年，表面意思是这样，但感觉逻辑上不通？