[Assessing the efficacy of non-arthroscopic joint lavage in patients with osteoarthritis of the knee].

OBJECTIVE To evaluate the efficacy of joint lavage in patients with osteoarthritis of the knee. DESIGN We conducted an open prospective study involving 111 patients of whom 77% were females. The patients' age range was 43-81 years and the average age 64±8.7 years. All patients had gonarthrosis as diagnosed according to the (ACR) American College of Rheumatology criteria (Kellgren radiographic grades II and III). Patients were randomly distributed between two treatment groups: a) Joint lavage without non-steroidal anti-inflammatory drugs (NAJL, n=57), and b) non-steroidal anti-inflammatory drugs alone (NSAIDs, n=54). Evaluations were done at baseline and one, three, and six months after enrollment. Clinical and demographic variables, and WOMAC index scores, were recorded and patient improvement was determined by following the OARSI guidelines. Statistical analyses included chi-square, analysis of covariance (baseline WOMAC) with one between-subject factor (treatment). Post-hoc comparisons were made with Sidak's adjustment. RESULTS The respective improvement rates as measured by the OARSI index for the patients in the JL and NSAIDs groups were 50.9 and 31.5% at 1 month; 55.4 and 38.9% at three months; and 63.2 and 64.8% at six months. The patients in both groups were seen to improve from the first month (P=.038). At the end of the six-month follow-up period, the WOMAC score had decreased significantly in both groups (P=.000), with no significant differences between them. CONCLUSIONS Six months after treatment, joint lavage proved as effective as NSAIDs in patients with gonarthrosis, so it constitutes an effective therapeutic choice in those cases where NSAIDs are contraindicated.