What hip and spinopelvic characteristics are associated with ischiofemoral impingement?

Listen to Brian and Lisa discuss the paper 'What hip and spinopelvic characteristics are associated with ischiofemoral impingement?' published in the June 2026 issue of Bone & Joint Open.

Click here to read the paper.

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Transcript

[00:00:00] Welcome back to another episode of AI Talks with Bone & Joint from the publishers of Bone & Joint Open. Today, we're discussing the paper "What hip and spinopelvic characteristics are associated with ischiofemoral impingement?" published in June 2026 by V J Leopold and colleagues. I am Brian, and I am joined by my co-host, Lisa.

Hello, Brian, and hello to our listeners. This paper offers some intriguing insights into ischiofemoral impingement, or IFI, a relatively uncommon but clinically significant cause of hip pain. IFI results from mechanical compression between the lesser trochanter and the ischium, often leading to pain and restricted mobility. This study utilized MRI to confirm the prevalence and characteristics associated with IFI.

Let's first explore why this research is important. Ischiofemoral impingement is increasingly recognized as a cause of hip pain. It produces deep [00:01:00] posterior hip pain that can radiate to the groin or thigh and worsens with hip movements.

The narrowing of the ischiofemoral space detected using MRI is a key diagnostic indicator. Absolutely, Brian. The study aimed to determine how common MRI-confirmed IFI is amongst young patients with non-arthritic hip pain. It also evaluated how various hip and spinopelvic characteristics are associated with IFI.

The researchers screened a total of 385 patients, but eventually focused on 250 due to the rigorous imaging requirements. They used a combination of imaging techniques: MRI, CT, and standardized radiographs in both standing and seated positions. These methods allowed them to thoroughly assess both static and dynamic spinopelvic parameters.

They found that IFI was present in 5.6% of the patients, all of whom were female. Yes, and that brings up a fascinating discussion about sex-specific differences in pelvic [00:02:00] anatomy. For instance, women often have a wider intertuberoous distance, potentially narrowing the ischiofemoral space and increasing the risk of IFI.

Moreover, the study highlighted that IFI patients had greater femoral version and ischial angles, reduced offsets, and specific spine alignments like lower lumbar lordosis and higher pelvic tilt. These findings suggest that not only hip morphology but also spinopelvic alignment plays a crucial role. The reduced quadratus femoris space and increased pelvic tilt were particularly significant indicators.

The study concluded that IFI could be influenced by both local femoral and pelvic morphology as well as lumbopelvic stiffness and sagittal imbalance. They used multivariate regression to identify these independent predictors. Reduced quadratus femoris space was a strong predictor, emphasizing the role of bony morphology. [00:03:00] Additionally, lower lumbar lordosis in a standing position was another significant predictor of IFI.

Yes, and they also noted that higher femoral version contributes to narrowing the ischiofemoral interval, which could lead to impingement. Dynamic factors such as the pelvic tilt angle, changing during posture transition from standing to sitting also play a part but were less significant compared to the static measurements.

From a clinical perspective, these findings suggest that for patients presenting with non-arthritic, posterior or ill-defined hip pain, a thorough assessment of sagittal spinopelvic alignment should be considered. This can help in understanding how lumbar and pelvic stiffness or imbalance might be affecting the hip joint.

To sum up, it's clear that IFI, although uncommon, should be on the radar of clinicians dealing with hip pain, especially in women. The integrated approach of using both hip morphology and spinopelvic alignment provides a more comprehensive understanding of the [00:04:00] condition, aiding in accurate diagnosis and potentially more effective treatment plans.

Well put, Brian. These findings not only advance our understanding of hip spine interaction but also underscore the importance of personalized diagnostic pathways. So the next time a young patient with unexplained hip pain walks in, IFI should definitely be considered.

Exactly, Lisa. And that’s all we have for today’s episode. Thank you all for joining us on AI Talks with Bone & Joint. We hope you found today’s discussion on ischiofemoral impingement both informative and engaging. Thanks for tuning in, everyone. See you next time