Quadriceps strain typically affects the rectus femoris muscle. The rectus femoris is the only two joint muscle in the quadriceps, however all the four muscles receive innervation from the femoral nerve.
The indirect head of the rectus femoris gives rise to a central tendon in the proximal thigh leading to strains proximal to the musculotendinous junction. These strains can occur proximally or distally.
The quadriceps are commonly affected for because of these reasons
It crosses two joints, has a high percentage of type II fibers, and has a complex musculotendinous architecture.
The quadriceps strains are generally managed nonoperatively
Sudden forceful eccentric muscle contraction of the quadriceps is required during hip extension and knee flexion and can lead to increased forces across the muscle-tendon interface leading to strains.
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