Intra-sheath vs Extra-sheath Injection for De Quervain's Tenosynovitis

Ultrasound guided corticosteroid injection composed of 1ml of 1% lidocaine and 1ml (20mg) of dexamethasone. Injection will be administered directly into the abductor pollicis longus/ extensor pollicis brevis sheath.

Ultrasound guided corticosteroid injection composed of 1ml of 1% lidocaine and 1ml (20mg) of dexamethasone. Injection will be administered surrounding the abductor pollicis longus/ extensor pollicis brevis sheath.

To ensure accuracy of fluid deposition into the tendon sheath in the intra-sheath injection arm and outside of the tendon sheath in the extra-sheath injection arm, all injections will be performed under ultrasound guidance. The ultrasound machine used will be a portable ultrasound machine located at the UC Davis orthopaedic clinic in Sacramento