When should NMES to the quadriceps begin after ACL reconstruction?

When should NMES to the quadriceps begin after ACL reconstruction?

• A. Immediately post-op
• B. Two weeks post op
• C. After achieving 60% quad strength
• D. At 8 weeks

Answer: (A)

Early activation of the quadriceps after ACL reconstruction is key because swelling, pain, and joint changes commonly cause the quadriceps to "shut down" (neural inhibition) and begin to atrophy. NMES provides an external stimulus that recruits motor units and produces a meaningful muscle contraction even when voluntary effort is limited, helping preserve muscle bulk and the neural pathways that enable later strengthening. Starting NMES immediately post-op leverages the period when the muscle is most at risk for rapid loss and sets the stage for smoother progression into resisted exercises and range-of-motion work. It is used with medical clearance and appropriate precautions to avoid stressing the graft. Waiting to start two weeks post-op, waiting for the quad to reach a certain strength level, or delaying until eight weeks misses the opportunity to counteract early muscle inhibition and atrophy, making the subsequent rehabilitation harder and longer.

Early activation of the quadriceps after ACL reconstruction is key because swelling, pain, and joint changes commonly cause the quadriceps to "shut down" (neural inhibition) and begin to atrophy. NMES provides an external stimulus that recruits motor units and produces a meaningful muscle contraction even when voluntary effort is limited, helping preserve muscle bulk and the neural pathways that enable later strengthening.

Starting NMES immediately post-op leverages the period when the muscle is most at risk for rapid loss and sets the stage for smoother progression into resisted exercises and range-of-motion work. It is used with medical clearance and appropriate precautions to avoid stressing the graft.

Waiting to start two weeks post-op, waiting for the quad to reach a certain strength level, or delaying until eight weeks misses the opportunity to counteract early muscle inhibition and atrophy, making the subsequent rehabilitation harder and longer.