21 Questions
What differentiates grades 3a and 3b muscle injuries?
The location within the muscle
What defines a grade 3c (intratendinous) injury?
Loss of usual straight margins and tendon tension without complete defect
What is a characteristic of grade 4 muscle injuries compared to grade 3 injuries?
Sudden onset pain and significant limitation to activity
According to the British Athletics Muscle Injury Classification System, what indicates excellent agreement?
Interrater Kappa values of 0.88
What is a distinguishing factor between grades 3a and 4 muscle injuries?
Complete tears in the muscle or tendon
What process does 'injury classification' specifically refer to?
Describing an injury based on its location, mechanism, or underlying pathology
How can muscle strain be defined?
Ratio of muscle length deformation relative to the muscle resting length
What does a 'grade' indicate in the context of muscle injuries?
The severity of the injury
Which grade of muscle injury is characterized by extensive tears to the muscle?
Grade 3
In which grade of muscle injury is there evidence of fiber disruption extending to the periphery likely greater than 15 cm?
Grade 3a
Which grade of muscle injury extends from the peripheral fascia into the muscle?
Grade 2a
What type of signal change is seen in Grade 3b (muscular/musculotendinous) muscle injuries?
Greater than 50% of the muscle cross-sectional area
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
What does Grade 0a in the classification system for muscle strain refer to?
Focal muscle soreness after exercise
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
In the muscle strain classification system, what is characteristic of Grade 0b injuries?
Generalized muscle soreness with normal MRI findings
What is the most frequently injured bodily location in sports and recreation-related episodes?
Lower extremity
Which of the following is a property of biarthrodial muscles?
Greater contraction velocity
What is an important determinant of muscle contraction capacity?
Fibre length.
When do most hamstring muscle strain-type injuries occur?
At maximal running speeds
What grade of injury is described as a moderate tear within the tendon, less than 50% of max tendon diameter?
2c
Learn about the classification of muscle injuries based on internal and external forces, as well as anatomical locations of ruptures. Understand the significance of grading in indicating injury severity.
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