RCT: Platelet-rich intra-articular plasma injections do not improve symptoms and function in patients with ankle osteoarthritis.

Effect of Platelet-Rich Plasma Injections vs Placebo on Ankle Symptoms and Function in Patients With Ankle Osteoarthritis: A Randomized Clinical Trial – JAMA (free for a limited period)

Related:

RCT: No benefit from platelet-rich plasma injection for patients with debilitating Achilles tendinopathy.

M-A: Intra-articular saline injection is as effective as corticosteroids, platelet-rich plasma, and hyaluronic acid for hip osteoarthritis pain