Cohen et al developed an MRI scoring system for athletes with a hamstring injury. This can help to identify a player who may benefit from more aggressive management. The authors are from Thomas Jefferson University and the University of Pittsburgh.
Patient selection: athlete with hamstring injury
Parameters:
(1) age in years
(2) number of muscles affected
(3) location
(4) insertion affected
(5) percent of muscle involved on cross-section
(6) retraction in cm
(7) long axis T2 signal length in cm
Parameter
Finding
Points
age in years
<= 25 years
1
26 to 31 years
2
>= 32 years
3
number of muscles involved
1
1
2
2
3
3
location
proximal
1
mid-portion
2
distal
3
insertion affected
no
0
yes
2
percent of muscle injured on cross section
0%
0
25%
1
50%
2
>= 75%
3
retraction in cm
0 cm
0
0.1 to 1.9 cm
1
>= 2.0 cm
2
long axis T2 signal length
0 cm
0
1 to 5 cm
1
6 to 10 cm
2
> 10 cm
3
total score =
= SUM(points for all 7 parameters)
Interpretation:
• minimum score: 3
• maximum score: 19
• The higher the score the more severe the hamstring injury. A score < 10 was generally mild.
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