Quadratus femoris (QF) space (QFS) narrowing, ischiofemoral space (IFS) narrowing
Definitions
Painful compression of QF muscle between ischial tuberosity and lesser trochanter
IFS
Distance between ischial tuberosity and medial cortex of lesser trochanter
QFS
Distance between superolateral surface of hamstring tendons and posteromedial iliopsoas tendon or lesser trochanter
IMAGING
General Features
Radiographic Findings
CT Findings
MR Findings
Ultrasonographic Findings
Imaging Recommendations
Fluoroscopic Findings
DIFFERENTIAL DIAGNOSIS
PATHOLOGY
General Features
Staging, Grading, & Classification
CLINICAL ISSUES
Presentation
Demographics
Natural History & Prognosis
Treatment
DIAGNOSTIC CHECKLIST
Consider
Image Interpretation Pearls
Reporting Tips
Selected References
Nakano N et al: Treatment strategies for ischiofemoral impingement: a systematic review. Knee Surg Sports Traumatol Arthrosc. 28(9):2772-87, 2018
Hernando MF et al: Evaluation and management of ischiofemoral impingement: a pathophysiologic, radiologic, and therapeutic approach to a complex diagnosis. Skeletal Radiol. 45(6):771-87, 2016
Kim DH et al: Ultrasound-guided quadratus femoris muscle injection in patients with lower buttock pain: novel ultrasound-guided approach and clinical effectiveness. Pain Physician. 19(6):E863-70, 2016
Bredella MA et al: Pelvic morphology in ischiofemoral impingement. Skeletal Radiol. 44(2):249-53, 2015
Finnoff JT et al: Variability of the ischiofemoral space relative to femur position: an ultrasound study. PM R. 7(9):930-7; quiz 987, 2015
Hatem MA et al: Diagnosis and 2-year outcomes of endoscopic treatment for ischiofemoral impingement. Arthroscopy. 31(2):239-46, 2015
Maraş Özdemir Z et al: Ischiofemoral space on MRI in an asymptomatic population: normative width measurements and soft tissue signal variations. Eur Radiol. 25(8):2246-53, 2015
Singer AD et al: Ischiofemoral impingement syndrome: a meta-analysis. Skeletal Radiol. 44(6):831-7, 2015
Backer MW et al: Correlation of ultrasound-guided corticosteroid injection of the quadratus femoris with MRI findings of ischiofemoral impingement. AJR Am J Roentgenol. 203(3):589-93, 2014
Kim WJ et al: Ultrasound-guided prolotherapy with polydeoxyribonucleotide sodium in ischiofemoral impingement syndrome. Pain Pract. 14(7):649-55, 2014
Yoong P et al: Multiple hereditary exostoses and ischiofemoral impingement: a case-control study. Skeletal Radiol. 43(9):1225-30, 2014
Ganz R et al: The lesser trochanter as a cause of hip impingement: pathophysiology and treatment options. Hip Int. 23 Suppl 9:S35-41, 2013
Taneja AK et al: Ischiofemoral impingement. Magn Reson Imaging Clin N Am. 21(1):65-73, 2013
Tosun O et al: Ischiofemoral impingement: evaluation with new MRI parameters and assessment of their reliability. Skeletal Radiol. 41(5):575-87, 2012
Ali AM et al: Case report: imaging and surgical treatment of a snapping hip due to ischiofemoral impingement. Skeletal Radiol. 40(5):653-6, 2011
Torriani M et al: Ischiofemoral impingement syndrome: an entity with hip pain and abnormalities of the quadratus femoris muscle. AJR Am J Roentgenol. 193(1):186-90, 2009
Johnson KA: Impingement of the lesser trochanter on the ischial ramus after total hip arthroplasty. Report of three cases. J Bone Joint Surg Am. 59(2):268-9, 1977
Related Anatomy
Loading...
Related Differential Diagnoses
Loading...
References
Tables
Tables
KEY FACTS
Terminology
Imaging
Top Differential Diagnoses
Pathology
Clinical Issues
Diagnostic Checklist
TERMINOLOGY
Abbreviations
Ischiofemoral impingement (IFI)
Synonyms
Quadratus femoris (QF) space (QFS) narrowing, ischiofemoral space (IFS) narrowing
Definitions
Painful compression of QF muscle between ischial tuberosity and lesser trochanter
IFS
Distance between ischial tuberosity and medial cortex of lesser trochanter
QFS
Distance between superolateral surface of hamstring tendons and posteromedial iliopsoas tendon or lesser trochanter
IMAGING
General Features
Radiographic Findings
CT Findings
MR Findings
Ultrasonographic Findings
Imaging Recommendations
Fluoroscopic Findings
DIFFERENTIAL DIAGNOSIS
PATHOLOGY
General Features
Staging, Grading, & Classification
CLINICAL ISSUES
Presentation
Demographics
Natural History & Prognosis
Treatment
DIAGNOSTIC CHECKLIST
Consider
Image Interpretation Pearls
Reporting Tips
Selected References
Nakano N et al: Treatment strategies for ischiofemoral impingement: a systematic review. Knee Surg Sports Traumatol Arthrosc. 28(9):2772-87, 2018
Hernando MF et al: Evaluation and management of ischiofemoral impingement: a pathophysiologic, radiologic, and therapeutic approach to a complex diagnosis. Skeletal Radiol. 45(6):771-87, 2016
Kim DH et al: Ultrasound-guided quadratus femoris muscle injection in patients with lower buttock pain: novel ultrasound-guided approach and clinical effectiveness. Pain Physician. 19(6):E863-70, 2016
Bredella MA et al: Pelvic morphology in ischiofemoral impingement. Skeletal Radiol. 44(2):249-53, 2015
Finnoff JT et al: Variability of the ischiofemoral space relative to femur position: an ultrasound study. PM R. 7(9):930-7; quiz 987, 2015
Hatem MA et al: Diagnosis and 2-year outcomes of endoscopic treatment for ischiofemoral impingement. Arthroscopy. 31(2):239-46, 2015
Maraş Özdemir Z et al: Ischiofemoral space on MRI in an asymptomatic population: normative width measurements and soft tissue signal variations. Eur Radiol. 25(8):2246-53, 2015
Singer AD et al: Ischiofemoral impingement syndrome: a meta-analysis. Skeletal Radiol. 44(6):831-7, 2015
Backer MW et al: Correlation of ultrasound-guided corticosteroid injection of the quadratus femoris with MRI findings of ischiofemoral impingement. AJR Am J Roentgenol. 203(3):589-93, 2014
Kim WJ et al: Ultrasound-guided prolotherapy with polydeoxyribonucleotide sodium in ischiofemoral impingement syndrome. Pain Pract. 14(7):649-55, 2014
Yoong P et al: Multiple hereditary exostoses and ischiofemoral impingement: a case-control study. Skeletal Radiol. 43(9):1225-30, 2014
Ganz R et al: The lesser trochanter as a cause of hip impingement: pathophysiology and treatment options. Hip Int. 23 Suppl 9:S35-41, 2013
Taneja AK et al: Ischiofemoral impingement. Magn Reson Imaging Clin N Am. 21(1):65-73, 2013
Tosun O et al: Ischiofemoral impingement: evaluation with new MRI parameters and assessment of their reliability. Skeletal Radiol. 41(5):575-87, 2012
Ali AM et al: Case report: imaging and surgical treatment of a snapping hip due to ischiofemoral impingement. Skeletal Radiol. 40(5):653-6, 2011
Torriani M et al: Ischiofemoral impingement syndrome: an entity with hip pain and abnormalities of the quadratus femoris muscle. AJR Am J Roentgenol. 193(1):186-90, 2009
Johnson KA: Impingement of the lesser trochanter on the ischial ramus after total hip arthroplasty. Report of three cases. J Bone Joint Surg Am. 59(2):268-9, 1977
STATdx includes over 200,000 searchable images, including x-ray, CT, MR, and ultrasound images. To access all images, please log in or subscribe.