Objective: The purpose of this study is to clarify which morphologic variations of the
hip on MRI are associated with the development of ischiofemoral impingement.
Methods: Hip MRIs of patients who have been referred to our department between 2016-2017
were retrospectively reviewed and assessed for pathological signal changes in the quadratus femoris
muscle and ipsilateral hip or buttock pain. After assessment, ischial angle, inclination angle,
ischiofemoral space, quadratus femoris space, intertuberous distances and femur neck angle, femoral
torsion angle and knee angle were measured and compared in 37 hips of 20 patients and 56 hips
of 28 age-gender matched control subjects.
Results: There were statistically significant differences between the patient and control groups in
all MRI parameters except for intertuberous distances (p<0.05). Quadratus femoris space
(p<0.001) and ischiofemoral space (p<0.001) were significantly lower and femoral torsion angle
(p=0.02), femur neck angle (p=0.001), ischial angle (p=0.01) and inclination angle (p=0.03) values
were significantly higher in patients compared with the control group.
Conclusion: Decreased ischiofemoral space and quadratus femoris space, increased femoral torsion
angle, femur neck angle, ischial angle and inclination angle are found to be associated with IFI
on MRI. These pelvic anatomical variations may predispose to ischiofemoral impingement and
should be kept in mind for patients with hip pain.