Traditional therapeutic modalities include cryotherapy, sonotherapy, pulsed electrical stimulation, transcutaneous electrical nerve stimulation, high-volt pulsed current, and iotopheresis. Alternative modalities include acupuncture, magnetic field therapy, biofeedback,and massage. All therapeutic modalities should be considered adjuncts to progressive functional exercise. Controlled studies rarely reach consensus regarding the efficacy of therapeutic modalities,so their use should be individualized to the patient.