Electromyography of the Quadriceps Femoris Muscles in Subjects with Normal Knees and Acutely Effused Knees

The purpose of the study was to describe the electrical activity of the vastus medialis, rectus femoris, and vastus lateralis muscles in subjects with normal knees and acute, severely effused knees when contracting maximally at 30 degrees and 0 degrees of knee flexion. Two groups identified were 1) an effused group (n=8) with subjects having one effused knee and one normal knee and 2) a normal group (n = 8) with subjects having two normal …