Rosinsky et al reported an algorithm for the diagnosis of a symptomatic hip abductor tear. The authors are from the American Hip Institute Research Foundation, Des Moines University, and AMITA Health in Chicago.
Hip abductors: gluteus medius, gluteus minimus, and tensor fascia lata.
Patient selection: hip disorder, possibly of the hip abductor
Examination: hip arthroscopy
Parameters:
(1) age in years
(2) sex
(3) body mass index (BMI) in kg per sq meter
(4) lateral joint space in mm
(5) alpha angle in degrees in the 45° Dunn view
Parameter
Finding
Points
age in years
0.128 * (age)
sex
male
0
female
2.003
body mass index
0.034 * (BMI)
lateral joint space
0.104 * (space)
alpha angle
-0.014 * (angle)
value of X =
= SUM(points for all of the parameters) - 10.2
probability of hip abductor tear =
= 1 / ( 1 + EXP((-1) * X))
Performance:
• The area under the ROC curve is 0.89.
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