Abstract
ObjectiveTo determine the size of the ischiofemoral space (IFS) and quadratus femoris space (QFS) in patients with and without ischiofemoral impingement (IFI).Materials and MethodsCase-control study including consecutive patients submitted to magnetic resonance imaging (MRI) of the hip joint during a three-month period. Patients with deep gluteal pain who tested positive for IFI on at least one clinical test and showed signal changes in the quadratus femoris muscle on MRI were categorized as having a confirmed diagnosis of IFI.ResultsFinal sample comprised 50 patients submitted to unilateral MRI of the hip joint. The mean age was 47.3 ± 14.0 years (range, 22-76 years), and 33 (66%) of the patients were women. A diagnosis of IFI was made in 6 patients (12%), all of whom were female. On average, IFS and QFS were significantly smaller in IFI group than in control group (11.1 ± 2.7 mm versus 27.5 ± 6.5 mm and 5.3 ± 1.8 mm versus 18.8 ± 4.8 mm, respectively; p < 0.001 for both).ConclusionResults of specific clinical tests and MRI findings indicate that the IFS and QFS are significantly reduced in patients with IFI.
Highlights
Ischiofemoral impingement (IFI) was first described in 1977 in three patients with residual pain after total hip arthroplasty[1]
The intraclass correlation coefficients for the ischiofemoral space (IFS) and quadratus femoris space (QFS) values were 0.946 and 0.928, respectively
A diagnosis of IFI in presence of gluteal pain, positive physical examination, and edema of quadratus femoris muscle was observed in six patients (12%), all of whom were female
Summary
Ischiofemoral impingement (IFI) was first described in 1977 in three patients with residual pain after total hip arthroplasty[1]. This type of impingement has only recently been identified as a potential source of pain in patients with no history of trauma or surgery[2]. Because of insertion of psoas muscle into lesser trochanter and hamstrings in ischial tuberosity, impingement may lead to irritation of bursae around those structures[3]. Clinical tests consist of palpation of the IFS, the long-stride walking test, and the Radiol Bras. 2019 Jul/Ago;52(4):237241
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