Piriformis syndrome (PS) is an uncommon cause of sciatica that involves buttock pain referred to the leg. Diagnosis is often difficult, and it is one of exclusion due to few validated and standardized diagnostic tests. Treatment for PS has historically focused on stretching and physical therapy modalities, with refractory patients also receiving anesthetic and corticosteroid injections into the piriformis muscle origin, belly, muscle sheath, or sciatic nerve sheath. Recently, the use of botulinum toxin (BTX) to treat PS has gained popularity. Its use is aimed at relieving sciatic nerve compression and inherent muscle pain from a tight piriformis. BTX is being used increasingly for myofascial pain syndromes, and some studies have demonstrated superior efficacy to corticosteroid injection. The success of BTX in treating PS supports the prevailing pathoanatomic etiology of the condition and suggests a promising future for BTX in the treatment of other myofascial pain syndromes.

PRP intra-articular injections of the knee may be an effective alternative treatment for knee OA. However, current studies are at best inconclusive regarding the efficacy of the PRP treatment. A large, multicenter randomized trial study is needed to further assess the efficacy of PRP treatment for patients with knee OA.

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The current scientific literature relevant to the use of prolotherapy for osteoarthritis, low back pain, and other musculoskeletal conditions was reviewed and critically analyzed to determine a clinical effect. Three randomized, controlled studies were found studying the use of dextrose/glycerine/phenol prolotherapy for chronic low back pain; however, they were inconclusive due to the lack of adequate controls, heterogeneity in patient diagnoses, and variations in solutions injected. Two randomized, controlled studies were found that provide some evidence supporting the use of 10% dextrose prolotherapy for osteoarthritis. The sample size of the study (n = 13) involving osteoarthritic thumbs and fingers may have been too small to be strongly conclusive; however, it provides preliminary data to support future studies. Two studies involving osteoarthritic knees report an improvement in anterior cruciate ligament laxity; however, they did not have control groups for comparison. Only case reports were found supporting the pursuit of controlled clinical studies of prolotherapy for chronic neck pain. On the basis of the scarce body of literature critically reviewed to date, the clinical efficacy of prolotherapy in treating osteoarthritis, low back pain, and other musculoskeletal conditions remains inconclusive.