Contractile characteristics of the knee extensors after arthroscopic meniscectomy are poorly understood.
To measure the recovery of knee-extensor-muscle contractility after arthroscopic partial meniscectomy.
Single-group repeated measures.
Kinesiology and biomechanics laboratory.
Fourteen patients with arthroscopic partial medial meniscectomies.
Main Outcome Measures:
Maximal isometric voluntary contraction (MVC) force, rate of force development (MRFDES), and half-relaxation time (HRTES) of evoked tetanic contraction preoperatively and during 6 months postoperatively.
Two weeks postoperatively, a reduction in MVC force of 27.1% and in MRFDES of 17.8% and a prolongation of HRTES of 34.0% in the injured leg were found. A significant MVC-force deficit (17.5%) was observed 3 months postoperatively.
The recovery of knee-extensor-muscle voluntary strength is more delayed than are evoked tetanic-contractile characteristics after partial meniscectomy. The rehabilitation protocol seems to be insufficient to attain effective recovery of knee-extensor-muscle voluntary strength.