• Gunter Spahn, Gunther O Hofmann, and Hans M Klinger.
• Clinic of Traumatology and Orthopaedic Surgery Eisenach, Sophienstr. 16, 99817 Eisenach, Germany. spahn@pk-eisenach.de
• Knee Surg Sports Traumatol Arthrosc. 2013 Jul 1;21(7):1553-61.

PurposeKnee osteoarthritis is one of the most common orthopaedic diseases. Therapeutic options for this disease include conservative treatments and arthroscopic debridement and partial or complete replacement. This meta-analysis aimed to collect and analyse the available information on the effects of arthroscopic joint debridement related to the clinical outcomes, the required conversion to replacement and the factors for patient selection.MethodsA search for publications was performed in the PubMed, Cochrane and EMBASE medical databases. The primary search resulted in a total of 1,512 citations. The results from 30 papers were included in this study. The extracted dates were listed in a standardised protocol. The statistical evaluation was performed using Comprehensive Meta-analysis software (V2 Biostat, Englewood, NJ, USA).ResultsNo randomised study that compared conservative and arthroscopic treatments for knee osteoarthritis was found. Most studies reported middle-term results after arthroscopic operations. The results of these studies showed excellent or good outcomes in more than 60 % of all patients. These results were correlated with a significant increase in the knee scores from baseline to follow-up; the standardised difference in means was 2.3 (CI 95 % 1.5-3.0, p < 0.001). The required conversion rate to replacement increased as the follow-up interval increased. The rates were as follows: 1 year-6.1 % (CI 95 %, 2.1-16.6 %), 2 years-16.8 % (CI 95 %, 10.2-26.3 %), 3 years-21.7 % (CI 95 %, 15.5-29.1 %) and 4 years-34.1 % (CI 95 %, 22.8-47.6 %). The mean survival time was 42.7 (CI 95 %, 14.5-71.1) months. Numerous factors influenced the outcome, including the radiological stage of the osteoarthritis and individual patient factors (e.g. time of history of osteoarthritis, weight and smoking). The local knee findings, such as axial dysalignment, missing effusion and massive crepitus, were also correlated with patient outcome.ConclusionArthroscopic joint debridement is a potential and sufficient treatment for knee osteoarthritis in a middle-term time interval. This procedure results in an excellent or good outcome in approximately 60 % of patients in approximately 5 years.Level Of EvidenceSystematic review of studies, Level III.

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