Table 3

Characteristics of intramuscular increased signal intensity on fluid-sensitive MRI sequences of initial injury and at return to play (RTP)

Initial injuryRTP
Intramuscular increased signal intensity
Involved muscles
 Biceps femoris long head44/5383%39/4783%
 Biceps femoris short head0/530%0/470%
Extent of increased signal intensity
 Mean longitudinal length (SD)132 mm± 6277 mm±53*
 Median involved cross-sectional muscle area (minimum–maximum)28%1–1008%0–90*
  • *Statistically significant difference between initial injury and RTP: p=0.000.