Intra-articular hyaluronic acid compared with corticoid injections for the treatment of rhizarthrosis

Objective: Prospective assessment of the efficacy and tolerability of intra-articular sodium hyaluronate (SH; Ostenil(R)mini) and triamcinolone acetonide (TA; Volon(R) A10) for treatment of osteoarthritis (OA) of the carpometacarpal (CMC) joint of the thumb in a 26-week, controlled, randomized, on an intention to treat, masked-observer study. Methods: Patients were treated with three intra-articular injections of either SH (n=28) or TA (n=28). Primary assessments were pain according to a 100 mm visual analogue scale and extensive clinical and functional parameters such as swelling, grip power and range of motion. The population was analysed using one- and two-sided Mann-Whitney (MW) estimators. Results: Maximum pain relief occurred at 2-3 weeks for TA and at week 26 for SH after the first intra-articular injection, At weeks 2-3 TA was significantly better than SH (MW:0.3319 and 0.3063;P=0.9827 and 0.9929). At week 26 a slight superiority of SH could be observed (MW: 0.53; P=0.3624)and non-inferiority could be proven. After 26 weeks lateral pinch power was significantly better in the SH-group (MW:0.6331; P=0.0226). In all, 88.0% of patients treated with SH and 79.1% of the TA-group described pain improvement after 26 weeks. Both agents were well tolerated. No adverse events with causal connection to the investigational products occurred, Conclusion: A single course of three SH injections is effective in relieving pain and improving joint function in patients with OA of the CIVIC joint of the thumb. Although in comparison with triamcinolone its effects are achieved more slowly, the results indicate a superior long-lasting effect of hyaluronan at 6 months after end of treatment period. (C) 2005 OsteoArthritis Research Society International. Published by Elsevier Ltd. All rights reserved.