Muscle Injury Classification
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Questions and Answers

What differentiates grades 3a and 3b muscle injuries?

  • The presence of complete tears
  • The length of tendon involvement
  • The degree of palpable gap felt
  • The location within the muscle (correct)

    • What defines a grade 3c (intratendinous) injury?

  • Complete defect in the tendon
  • Less than 5 cm longitudinal length of injury
  • Less than 50% of the tendon's maximal cross-sectional area affected
  • Loss of usual straight margins and tendon tension without complete defect (correct)

    • What is a characteristic of grade 4 muscle injuries compared to grade 3 injuries?

  • Loss of usual margins without tendon tension
  • Sudden onset pain and significant limitation to activity (correct)
  • Longitudinal length greater than 5 cm
  • Less pain on contraction

    • According to the British Athletics Muscle Injury Classification System, what indicates excellent agreement?

    <p>Interrater Kappa values of 0.88</p> Signup and view all the answers

    What is a distinguishing factor between grades 3a and 4 muscle injuries?

    <p>Complete tears in the muscle or tendon</p> Signup and view all the answers

    What process does 'injury classification' specifically refer to?

    <p>Describing an injury based on its location, mechanism, or underlying pathology</p> Signup and view all the answers

    How can muscle strain be defined?

    <p>Ratio of muscle length deformation relative to the muscle resting length</p> Signup and view all the answers

    What does a 'grade' indicate in the context of muscle injuries?

    <p>The severity of the injury</p> Signup and view all the answers

    Which grade of muscle injury is characterized by extensive tears to the muscle?

    <p>Grade 3</p> Signup and view all the answers

    In which grade of muscle injury is there evidence of fiber disruption extending to the periphery likely greater than 15 cm?

    <p>Grade 3a</p> Signup and view all the answers

    Which grade of muscle injury extends from the peripheral fascia into the muscle?

    <p>Grade 2a</p> Signup and view all the answers

    What type of signal change is seen in Grade 3b (muscular/musculotendinous) muscle injuries?

    <p>Greater than 50% of the muscle cross-sectional area</p> Signup and view all the answers

    Which grade of muscle injury extends into the tendon but has an evident injury over a longitudinal length of less than 5 cm?

    <p>Grade 2c</p> Signup and view all the answers

    What does Grade 0a in the classification system for muscle strain refer to?

    <p>Focal muscle soreness after exercise</p> Signup and view all the answers

    Which grade of muscle injury presents with high signal change on fat suppressed/STIR axial images within the periphery of the muscle less than 5cm?

    <p>Grade 1a</p> Signup and view all the answers

    In the muscle strain classification system, what is characteristic of Grade 0b injuries?

    <p>Generalized muscle soreness with normal MRI findings</p> Signup and view all the answers

    What is the most frequently injured bodily location in sports and recreation-related episodes?

    <p>Lower extremity</p> Signup and view all the answers

    Which of the following is a property of biarthrodial muscles?

    <p>Greater contraction velocity</p> Signup and view all the answers

    What is an important determinant of muscle contraction capacity?

    <p>Fibre length.</p> Signup and view all the answers

    When do most hamstring muscle strain-type injuries occur?

    <p>At maximal running speeds</p> Signup and view all the answers

    What grade of injury is described as a moderate tear within the tendon, less than 50% of max tendon diameter?

    <p>2c</p> Signup and view all the answers

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