Contusions

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Because of the superficial location, contusion injury of the quadriceps may occur. Typical clinical history of pain and swelling exists along either MRI

Vastus Lateralis Tendinitis Mri

Fig. 12. Sagittal image of a normal quadriceps tendon with superficial (black arrow rectus femoris), middle (white arrow, vastus lateralis and medialis) and deep fibers (open arrow, vastus intermedius) (A). Different patient with partial tear of quadriceps tendon (black arrow) and residual intact fibers of vastus intermedius (B).

Fig. 12. Sagittal image of a normal quadriceps tendon with superficial (black arrow rectus femoris), middle (white arrow, vastus lateralis and medialis) and deep fibers (open arrow, vastus intermedius) (A). Different patient with partial tear of quadriceps tendon (black arrow) and residual intact fibers of vastus intermedius (B).

findings of muscle swelling and interstitial edema and hemorrhage [51,52] (Fig. 13). Contusions of the rectus femoris have been graded clinically into mild, moderate, and severe based on knee flexion, swelling, and pain [51]. The degree of injury is associated with length of disability and likelihood of myositis ossificans. Mild, moderate, and severe contusions resolved on average of 6.5, 56, and 72 days, respectively. Moderate to severe injuries were more likely to develop myositis ossificans. No corresponding MR criteria exists, although anecdotally the greater the amount of edema and cross-sectional involvement the longer the healing time.

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