1ml injection of a mixture of 0.5ml triamcinolone acetonide (50mg/5ml) and 0.5ml 1% lignoacaine is given intra-thecally into the first extensor compartment.

a long thumb spica thermoplastic splint (wrist neutral, 30º CMCJ flexion, 30º thumb abduction, IPJ free) will be customized and intermittent active range of motion exercises will be taught for 4 weeks

Intervention will be done on the same day based on the randomization.

For the steroid injection group, a 1ml injection of a mixture of 0.5ml triamcinolone acetonide (50mg/5ml) and 0.5ml 1% lignoacaine is given intra-thecally into the first extensor compartment.

For both groups, routine analgesia is not prescribed but the use is not restricted to the participants.

Our co- primary outcome would be QuickDash. QuickDash is a disability score we use for the upper limb where the higher score indicates greater disability and severity. We would expect a decrease in QuickDash scores following a success in the treatment measure. The resultant score is reported on a scale of 0 to 100, where 0 represents no disability and 100 represents total disability

The other primary outcomes would be the number of patients who have completely recovered from De Quervain's tenosynovitis. This will be determined by the global improvement the patient feels that will be ranked on a 7 point Likert scale (1: very much worse, 2: much worse, 3:slightly worse, 4:no change, 5:slightly better, 6:much better, 7:completely resolved).