There are 4 types of skeletal muscle injuries: The most common sites of strains are the muscle tendon junction just above the knee (both distal and proximal but most frequently at the distal muscle-tendon) and in the muscle itselfĮpidemiology/ Etiology The rectus femoris is the most superficial part of the quadriceps and it crosses both the hip and knee joints, thus also making it more susceptible to stretch-induced strain injuries. The other 3 parts are only involved in the extension of the knee. The Rectus femoris is the only part of the muscle participating in both flexion of the hip and extension of the knee. This muscle is composed of 4 sub components: It is located in the anterior compartment of the thigh. The Quadriceps femoris is a hip flexor and a knee extensor. Muscle fatigue has also been shown to play a role in acute muscle injury. These include muscles crossing two joints, those with a high percentage of Type II fibers, and muscles with complex musculotendinous architecture. Several factors predispose this muscle and others to more frequent strain injury. Of the quadriceps muscles, the rectus femoris is most frequently strained. Excessive passive stretching or activation of a maximally stretched muscle can also cause strains. Higher forces across the muscle–tendon units with eccentric contraction can lead to strain injury. These sports regularly require sudden forceful eccentric contraction of the quadriceps during regulation of knee flexion and hip extension. Īcute strain injuries of the quadriceps commonly occur in athletic competitions such as soccer, rugby, and football. The quadriceps, which consists of four parts, can be overloaded by repeated eccentric muscle contractions of the knee extensor mechanism.
10 Rehabilitation Protocol Example ĭefinition/Description Ī quadriceps muscle strain is an acute tearing injury of the quadriceps.This injury is usually due to an acute stretch of the muscle, often at the same time of a forceful contraction or repetitive functional overloading.5 Characteristics/Clinical Presentation.
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