Thumb Base Osteoarthritis: Ultrasound-guided Platelet-rich Plasma Versus Placebo Injection (Thumbs-up)

The goal of this clinical trial is to evaluate whether platelet-rich plasma (PRP) injections improve pain and function in adults with thumb base osteoarthritis (CMC-I OA). The main questions it aims to answer are: Does a PRP injection reduce pain compared to a placebo (saline) injection? Does PRP improve hand function, strength, and thumb mobility? What adverse events occur following PRP treatment? Researchers will compare PRP injections to a placebo injection (saline solution) to determine whether PRP is an effective treatment for CMC-I osteoarthritis. Participants will: Receive a single ultrasound-guided injection of PRP or placebo (saline) in the CMC-I joint. Attend follow-up visits at 3, 6, 9, and 12 months for clinical assessments. Complete questionnaires on pain (VAS) and hand function (MHQ-DLV) at multiple time points. Undergo physical examinations (grip strength, pinch strength, thumb motion). Undergo ultrasound evaluations to assess joint characteristics.

• Clinical pain improvement: Visual Analog Scale (VAS) for pain

1. Study completion expected

   Jun 2027

2. Primary completion expected

   May 2027

3. Last registry update

   5 Oct 2026

4. Started

   20 May 2026

5. Registered

   24 Mar 2026