Injection of corticosteroids into the digital flexor tendon sheath is an accepted and effective treatment for stenosing tenosynovitis. However, despite long historical experience with this procedure, there remains no guide in the literature as to the optimal dose of steroid. Furthermore, the accuracy of these injections has not been well established. Using a prospective, randomized, blinded design, this study compares the outcomes of high (20 mg) and low (10 mg) dose depomedrol injection. Furthermore, the accuracy of tendon sheath injections was assessed radiographically. The findings demonstrate increased effectiveness of the higher steroid dose and a significant learning curve associated with intra-thecal injections.

Injection of corticosteroids into the digital flexor tendon sheath is an accepted and effective treatment for stenosing tenosynovitis (trigger finger). However, despite long historical experience with this procedure, there remains no guide in the literature as to the safe and effective dose of steroid to be administered. Furthermore, the accuracy of digital tendon sheath injections has not been well established. One study has suggested that steroid injected outside the tendon sheath was as effective as intra-thecal injection and may result in reduced complications of infection and tendon rupture.

Using a prospective, blinded design, patients were randomized to receive either high (20 mg) or low (10 mg) dose depomedrol injection. The accuracy of the steroid injections was determined radiographically using non-ionic radio-opaque dye. Outcome measures included pain, tenderness, presence of a palpable nodule, triggering, and limitation of activities (work, hobbies, ADLs). Complications such as pain, stiffness, bruising, thinning of the fat or skin, infection and tendon rupture were also recorded.

Higher dose depomedrol (20 mg) was found to be more effective for relieving pain and triggering than lower dose depomedrol (10 mg). No increase in complication rate was encountered. Stenosing tenosynovitis in diabetic patients was markedly less responsive to treatment.

Injection accuracy was found to increase with clinical experience from approximately 50% for beginners to over 90% for experienced hand surgeons. At the time of submission of this abstract, patient numbers (currently forty-one participants) do not allow analysis regarding the effect of injection accuracy on clinical outcome.