Ischiofemoral Impingement

Purpose

To assist radiologists in the detection of an anatomical disturbance of the hip

Tag(s)

 

Panel

Musculoskeletal Panel

Define-AI ID

19050018

Originator

Musculoskeletal Panel
Lead Jay Patti

Panel Chair

Jay Patti

Panel Reviewers

Musculoskeletal Panel

License

Creative Commons 4.0 
Status Public Commenting
RadElement Set RDES122
                               

Clinical Implementation


Value Proposition

Ischiofemoral impingement is a disorder of the hip where the space between the lesser trochanter and ischium is too narrow. This can cause the structures that normally course between these two bones to become impinged creating symptoms such as pain or a snapping sensation as the bones pass each other during activities such as walking. When patients are imaged with MRI and have this condition, the anatomic relationship between the lesser trochanter and ischium is abnormal and there is usually edema in a muscle (Quadratus femoris muscle) that courses between the two bones. This is a recently described syndrome in the literature and hence the awareness of this problem among radiologists is low.

Narrative

A 40 year old woman with progressive groin pain has an MRI scan. The relationship of the lesser trochanter with respect to the ischium is abnormal. The radiologist is alerted to the abnormal anatomic relationship of these two bones and can use this information in determining if this could be the cause of a patient’s clinical symptoms. The alert avoids an error of failure to diagnose.

Workflow Description

The hip or pelvis MRI is processed by the algorithm which is tuned to identify the spatial relationship of the relevant anatomical structures as well as edema in the muscle that runs between them. The engine would send a message to PACS with the coordinates of the anatomic structures and would alert the radiologist if the relationship is abnormal.

Considerations for Dataset Development



Patient Age

>7 years

Procedures

MRI HIP, MRI PELVIS

Sex at Birth

male, female

Differential Diagnoses

absence of anatomic abnormality, presence of anatomic abnormality

MRI data collection technique

varied

Anatomic location

Hip, pelvis

View

MRI Axial T1, MRI Axial T2, MRI Axial T1 FS (arthrogram)

Technical Specifications


Inputs

 

DICOM Study

Procedure

MRI pelvis, hip

Views

MRI Axial T1, MRI Axial T2, MRI Axial T1 FS (arthrogram)

Data Type

DICOM

Modality

MRI

Body Region

Pelvis

Anatomic Focus

Hip


Primary Outputs


IFI Status

RadElement ID

RDE795

Definition

Status of ischiofemoral impingement

Data Type

Categorical

Value Set

  • Abnormal
  • Normal
  • Undetermined

Units

N/A

References


1. J Hip Preserv Surg. 2016 Aug; 3(3): 197–202.

Published online 2016 Mar 1. doi: 10.1093/jhps/hnw003

PMCID: PMC5005057

PMID: 27583158

2. Torriani M, Souto SC, Thomas BJ, et al. Ischiofemoral impingement syndrome: an entity with hip pain and abnormalities of the quadratus femoris muscle. Am J Roentgenol 2009;193:186–90. 

3 Narrowing of ischiofemoral and quadratus femoris spaces in pediatric ischiofemoral impingement

Shlomit Goldberg-Stein1 & Avi Friedman1 & Qi Gao2 & Jaeun Choi2 & Jacob Schulz3 & Eric Fornari3 & Benjamin Taragin4,5