Patterned Electrical Neuromuscular Stimulation and Therapeutic Exercise for Osteoarthritis of the Knee: Pilot Study

"* 20-minute session, to each affected knee, 3 times per week for 12 weeks.~* PENS for 20 minutes:~ * Tri-phasic Lower Extremity stimulation pattern based on activation timing of the quadriceps and hamstrings for strength training (50 Hz impulses for 200 ms every 1500 ms).~ * Minimal twitch for 5 minutes.~ * Moderate to strong, but well-tolerated twitch contractions for 15 minutes.~* Electrodes placed on quadriceps and hamstrings"

"* 20-minute session, to each affected knee, 3 times per week for 12 weeks.~* Placebo PENS for 20 minutes:~* Electrodes placed on quadriceps and hamstrings."