Myer et al developed a nomogram for identifying a female athlete at high risk for injury to the anterior cruciate ligament. This can help to identify an athlete who may benefit from interventions to reduce this risk. The authors are from Cincinnati Children's Hospital, the University of Cincinnati, Ohio State University and Rocky Mountain University of Health Professions (Provo, Utah).
Patient selection: female athlete
Parameters:
(1) length of the tibia in cm (from 26 to 50 cm)
(2) knee valgus motion in cm (from 0 to 13 cm)
(3) knee flexion range of motion (ROM) in degrees (from 20 to 90 degrees)
(4) body mass in kilograms (from 20 to 100 kg)
(5) quardriceps-to-hamstring ratio (from 0.6 to 3.6)
points for tibia length =
= (4.1667 * (length of tibia)) - 108.33
points for knee valgus motion =
= (4.5385 * (valgus motion))
points for knee flexion ROM =
= (-0.2857 * (ROM)) + 25.714
points for body mass =
= (0.394 * (body mass)) - 7.875
points for quadricepst-to-hamstring ratio =
= (6.667 * (ratio)) - 4
total score =
= SUM(points for all 5 parameters)
Interpretation:
• minimum score: 0
• maximum score: 230.5 points
• The higher the score the greater the probability of high knee load and injury to the anterior cruciate ligament.
|
Score
|
Probability of High Knee Load
|
|
< 58
|
< 10%
|
|
58 to 100
|
(1.775 * (points)) - 102.8
|
|
100 to 144
|
(-0.01350 * ((points)^2)) + (3.921 * (points)) - 184.4
|
|
> 144
|
> 99%
|
