No abstract

We examined the natural history of arthroscopic medial meniscectomy in knees with an isolated meniscal injury by reviewing 317 of 894 cases following medial meniscectomy. At the time of the initial surgery none of the knees had been operated on, and there was no evidence of ligament injury. The patients were reviewed clinically and radiologically after a mean of 11.5 years (range 10-15). The knee was considered "normal" or "nearly normal" by 91% of patients. In 218 patients the contralateral knee was asymptomatic without history of operation or significant injury and could be used as control for comparison. Radiology showed 22.4% greater excess prevalence of joint space narrowing in the operated compared to the control knee. The factors predisposing to a poor radiological result were age above 35 years, the presence of medial compartment cartilage degeneration at the time of the first arthroscopy, resection of the posterior one-third of the meniscus, and meniscal rim resection. Preoperative participation in sport was a predictor of a better outcome.

Level IV continuous retrospective study.

No abstract

Purpose The present study was designed to evaluate the long-term results (more than 10 years) of mobile bearing total knee arthroplasty (TKA) and to compare the survival of medial pivot axis (MPA) and central pivot axis (CPA) TKAs. The primary hypothesis was that the 10-to 15-year survival rate of MPA TKAs will be better than CPA TKAs. Methods A national, multicenter, retrospective study was performed in France. In this case-control design, 1154 TKAs were paired into the CPA group (control group: 577 cases) and MPA group (study group: 577 cases) based on a logistic regression analysis of age, gender, body mass index and severity of the coronal deformity, deining the propensity score for each case. Final survival information follow-up was obtained for 946 cases (82%). Results There was no signiicant diference between the control and study groups for any baseline data. Twenty-two prosthetic revisions (2%) were performed for mechanical reasons during the follow-up period. There was no signiicant diference between the 13-year survival rates of CPA (98%) and MPA (97%) TKAs. There was no signiicant diference between groups in their inal Oxford and Knee Society scores. Conclusion Our indings do not support the assumption that medialization of the pivot axis of a mobile bearing TKA improves clinical results or survival. Level of evidence Level III.