The superiority of water-diluted 0.25% to neat 1% lidocaine for trigger-point injections in myofascial pain syndrome: a prospective, randomized, double-blinded trial

Trigger-point injection with a mixture of commercially available 1% lidocaine in sterile distilled water at a ratio of 1:3 compared with 1% lidocaine alone resulted in better efficacy and less injection pain. This simple procedure may be suitable for treatments of a wide range of myofascial pain syndromes.