Muscle injury

Dr Henry Knipe et al.

Muscle injuries are common in both elite and amateur athletes as well as in the general population. 

Typically, muscle injuries present with pain and loss of function. Clinically, they can be graded as 1:

  • grade 1: no appreciable muscle tearing, <5% loss of function/strength
  • grade 2: damage to the musculotendinous junction (MTJ); reduced strength; some residual function
  • grade 3: complete tear of the MTJ; loss function +/- a palpable gap

Muscle injuries can consist of 1-3:

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Article information

rID: 68378
Synonyms or Alternate Spellings:
  • Muscle injury - overview
  • Muscle injuries

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Cases and figures

  • Case 1: rectus femoris muscle contusion
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  • Case 2: DOMS
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  • Case 3: Rectus femoris distal MTJ rupture
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