Which patients might benefit from platelet-rich plasma?

Concerning the effectiveness of PRP, it is important to consider early publication bias. Although recent studies have shown its benefits,^6,14,15,37 additional studies comparing PRP to placebo will help demonstrate its efficacy. Interestingly, a literature search by Bar-Or et al³⁸ found intra-articular saline may have a therapeutic effect on knee OA and confound findings when used as a placebo.

RCT data showed no benefit with platelet-rich plasma in treating small-joint osteoarthritis.

Recognizing the presence or lack of clinically significant improvement in the literature is important. For example, while some recent studies have shown PRP exceeds the minimal clinically significant difference for knee OA and lateral epicondylitis, others have not.^32,37 A 2021 systematic review of 11 clinical practice guidelines for the use of PRP in knee OA found that 9 were “uncertain or unable to make a recommendation” and 2 recommended against it.³⁹

In its 2021 position statement for the responsible use of regenerative medicine, the American Medical Society for Sports Medicine includes guidance on integrating orthobiologics into clinical practice. The guideline emphasizes informed consent and provides an evidence-based rationale for using PRP in certain patient populations (lateral epicondylitis and younger patients with mild-to-­moderate knee OA), recommending its use only after exhausting other conservative options.⁴⁰ Patients should be referred to physicians with experience using PRP and image-guided procedures.

CORRESPONDENCE
Gregory D. Bentz Jr, MD, 3640 High Street Suite 3B, Portsmouth, VA 23707; bentzgd@evms.edu