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Related Concept Videos

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The movement of the legs is facilitated by numerous muscles located within the anterior, medial, and posterior compartments of the thigh.
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The human leg comprises an intricate system of muscles that facilitate the movement of feet and toes. Within this system, the muscles are categorized into the anterior, lateral, and posterior compartments, each with a unique set of muscles carrying out specific functions.
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The femur is the body's longest and strongest bone spanning the thigh region. Its head articulates with the acetabulum of the hip bone to form the hip joint. A minor indentation on the medial side of the femoral head, called the fovea capitis, serves as the site of attachment for the ligament of the head of the femur. This weak ligament spans the femur and acetabulum and supports the hip joint. The narrowed region below the head is the neck of the femur. The inclination angle between the...
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The thigh's motion is primarily governed by muscles originating in the pelvic girdle and inserted into the femur. One crucial muscle, the iliopsoas, is a combination of the psoas major and the iliacus muscles, sharing a common insertion point on the lesser trochanter of the femur.
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Satellite stem cells or myosatellite cells are quiescent stem cells that Alexander Mauro first identified in 1961. These cells are located between the sarcolemma, the plasma membrane of muscle fibers, and the basal lamina, the connective tissue sheath covering it. These mononucleated cells are activated in response to muscle injury, can transform into myoblasts, and may form or repair muscle fibers. Myosatellite cells can provide additional myonuclei for muscle regeneration or return to a...
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Related Experiment Video

Updated: Oct 1, 2025

Muscle Imbalances: Testing and Training Functional Eccentric Hamstring Strength in Athletic Populations
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Distal Hamstring Muscle Injuries.

John R Matthews1, John Hayden Sonnier1, John P Prodoehl2

  • 1Division of Sports Medicine, Rothman Orthopaedics, Philadelphia, Pennsylvania.

JBJS Reviews
|March 9, 2022
PubMed
Summary
This summary is machine-generated.

Distal hamstring injuries in athletes can cause significant issues, with MRI being key for diagnosis. Surgical repair is effective for some tears, while others may be managed nonoperatively.

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Area of Science:

  • Sports Medicine
  • Orthopedic Surgery
  • Musculoskeletal Imaging

Background:

  • Distal hamstring injuries, though infrequent, lead to considerable athlete morbidity.
  • Prolonged rehabilitation and high reoccurrence rates are common challenges.

Purpose of the Study:

  • To review current diagnostic and treatment strategies for distal hamstring injuries.
  • To highlight the role of magnetic resonance imaging (MRI) in evaluating these injuries.

Main Methods:

  • Literature review of distal hamstring injuries.
  • Analysis of diagnostic utility of MRI.
  • Evaluation of surgical and nonoperative treatment outcomes.

Main Results:

  • Magnetic resonance imaging (MRI) is the gold standard for evaluating hamstring injuries, assessing pathology, and guiding return-to-sport timelines.
  • Complete tears of the distal biceps femoris and semimembranosus muscles show good outcomes with surgical repair.
  • Complete tears of the distal semitendinosus can be treated nonoperatively or with surgical resection.

Conclusions:

  • Current treatment algorithms exist for complete distal hamstring tears.
  • Further research is needed to optimize treatments and explore biologic adjuvant therapies.