Efficacy of NSAID Peritendinous Injection for Acute Tendinitis

Acute tendon inflammation is a common sports injury, typically treated with oral or topical non-steroidal anti-inflammatory drugs (NSAIDs) or local corticosteroid injections at the affected site. Direct corticosteroid injections provide the fastest relief; however, the World Anti-Doping Agency (WADA) has restricted the use of corticosteroids by any route in its latest banned substance list. As a result, corticosteroid injections into tendons or joints, which were previously allowed during competitions, can no longer be used. Currently, the only methods available for acute inflammation relief during competitions are oral NSAIDs and ice therapy. For athletes without structural damage who need to quickly reduce inflammation and return to play, these methods may be insufficient.

Previous clinical studies on NSAID injections into tendons and joints have shown that local NSAID injections are equally effective as corticosteroid injections for treating shoulder impingement syndrome and knee osteoarthritis. However, these studies mainly focused on patients with chronic arthritis and tendinitis. The difference in efficacy between oral NSAIDs and tendon injections during the acute phase of inflammation remains unknown. This study aims to compare different routes of NSAID administration to identify the most appropriate treatment for managing acute tendinitis in high-level athletes.

We hypothesize that peritendinous NSAID injections will provide greater pain relief and functional improvement.