Hamstring Tendon Partially Torn From Tuberosity
Muscle Soreness and “Pulled” Muscles
Eccentric contractions that are either excessive or associated with a novel task are often the cause of delayed-onset muscle soreness. Thus, walking down many flights of stairs would actually result in more soreness, owing to the eccentric contractions, than walking up the same flights of stairs. The muscle stretching that occurs during the lengthening type of eccentric contraction appears to be more likely to produce microtears in the muscles and/or periosteal irritation than that associated with concentric contraction (shortening of the muscle belly).
Skeletal muscles are limited in their ability to lengthen. Usually, muscles cannot elongate beyond one third of their resting length without sustaining damage. This is reflected in their attachments to the skeleton, which usually do not permit excessive lengthening. An exception is the hamstring muscles of the posterior thigh. When the knee is extended, the hamstrings typically reach their maximum length before the hip is fully flexed (i.e., flexion at the hip is limited by the hamstring’s ability to elongate). Undoubtedly, this, as well as forces related to their eccentric contraction, explains why hamstring muscles are “pulled” (sustain tears) more commonly than other muscles.
Source: Clinically Oriented Anatomy
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