Muscle Injury Classification

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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?

Interrater Kappa values of 0.88 (A) Signup and view all the answers

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

Complete tears in the muscle or tendon (B) Signup and view all the answers

What process does 'injury classification' specifically refer to?

Describing an injury based on its location, mechanism, or underlying pathology (D) Signup and view all the answers

How can muscle strain be defined?

Ratio of muscle length deformation relative to the muscle resting length (C) Signup and view all the answers

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

The severity of the injury (B) Signup and view all the answers

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

Grade 3 (D) 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?

Grade 3a (B) Signup and view all the answers

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

Grade 2a (A) Signup and view all the answers

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

Greater than 50% of the muscle cross-sectional area (A) 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?

Grade 2c (A) Signup and view all the answers

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

Focal muscle soreness after exercise (D) 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?

Grade 1a (C) Signup and view all the answers

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

Generalized muscle soreness with normal MRI findings (A) Signup and view all the answers

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

Lower extremity (A) Signup and view all the answers

Which of the following is a property of biarthrodial muscles?

Greater contraction velocity (B) Signup and view all the answers

What is an important determinant of muscle contraction capacity?

Fibre length. (B) Signup and view all the answers

When do most hamstring muscle strain-type injuries occur?

At maximal running speeds (C) 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?

2c (C) Signup and view all the answers