Normal Ischiofemoral Distance and Its Associated Factors: Computed Tomography–Based Study

Heejae Won, Young Kyun Lee, Beom Seok Lee, Jung Wee Park, Seokhyung Won, Kyung Hoi Koo

Research output: Contribution to journalArticle

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Abstract

Purpose: The purposes of this study are (1) to measure the ischiofemoral distance (IFD) in nondiseased hips and (2) to reveal patient demographic and anatomical factors associated with IFD. Methods: In this retrospective study, we identified patients who had unilateral osteonecrosis of the femoral head on computed tomography (CT) scan from November 2005 to July 2018 and assessed the unaffected contralateral hips of the patients. Among the contralateral hips, we excluded hips with hip pain, incomplete or poor-quality CT image, incomplete medical record, degenerative arthritis of the hip, or previous hip surgery. IFD was measured on the axial CT image, and correlated demographic factors (age, sex, height, weight, and body mass index) and anatomical parameters (neck–shaft angle of the femur and femoral anteversion) with IFD were evaluated. Results: Five hundred seventeen patients (517 hips) were evaluated. There were 302 men and 215 women, and their mean age was 51.7 years (range 15-83 years). The mean IFD was 33.2 (±9.2) mm in men and 24.3 (±8.9) mm in women (P < .001). Interobserver and intraobserver reliability (intraclass correlation coefficients) were 0.99 (95% confidence interval 0.98-1.0) and 0.98 (95% confidence interval 0.97-0.99), respectively. The mean neck–shaft angle was 129.31° ± 5.04° in males and 129.93° ± 6.29° in females. The mean femoral anteversion was 9.72° ± 7.95° in males and 12.61° ± 8.91° in females. IFD was positively correlated with height (correlation coefficient [r] = 0.464, P < .001) and weight (0.286, P < .001), whereas it was negatively correlated with age (–0.198, P < .001), neck–shaft angle (–0.123, P = .005), and femoral anteversion (–0.346, P < .001). There was no correlation between body mass index and IFD (P = .522). In multivariate regression analysis, IFD was positively associated with height (β = .632), and negatively associated with neck–shaft angle of the femur and femoral anteversion (β = –0.155 and –0.328. respectively). Conclusions: In asymptomatic hips, the mean IFD was 33.2 ± 9.2 mm in males and 24.3 ± 8.9 mm in females. The IFD was positively correlated with height and negatively with neck–shaft angle of the femur and femoral anteversion. Level of evidence: Level III, retrospective comparative study.

Original languageEnglish
Pages (from-to)150-155
Number of pages6
JournalArthroscopy - Journal of Arthroscopic and Related Surgery
Volume36
Issue number1
DOIs
StatePublished - Jan 2020

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Hip
Thigh
Femur
Tomography
Body Mass Index
Retrospective Studies
Demography
Confidence Intervals
Weights and Measures
Osteonecrosis
Osteoarthritis
Medical Records
Multivariate Analysis
Regression Analysis
Pain

Cite this

@article{bd9dfe4d715648e5bdf2bcf88abf35f7,
title = "Normal Ischiofemoral Distance and Its Associated Factors: Computed Tomography–Based Study",
abstract = "Purpose: The purposes of this study are (1) to measure the ischiofemoral distance (IFD) in nondiseased hips and (2) to reveal patient demographic and anatomical factors associated with IFD. Methods: In this retrospective study, we identified patients who had unilateral osteonecrosis of the femoral head on computed tomography (CT) scan from November 2005 to July 2018 and assessed the unaffected contralateral hips of the patients. Among the contralateral hips, we excluded hips with hip pain, incomplete or poor-quality CT image, incomplete medical record, degenerative arthritis of the hip, or previous hip surgery. IFD was measured on the axial CT image, and correlated demographic factors (age, sex, height, weight, and body mass index) and anatomical parameters (neck–shaft angle of the femur and femoral anteversion) with IFD were evaluated. Results: Five hundred seventeen patients (517 hips) were evaluated. There were 302 men and 215 women, and their mean age was 51.7 years (range 15-83 years). The mean IFD was 33.2 (±9.2) mm in men and 24.3 (±8.9) mm in women (P < .001). Interobserver and intraobserver reliability (intraclass correlation coefficients) were 0.99 (95{\%} confidence interval 0.98-1.0) and 0.98 (95{\%} confidence interval 0.97-0.99), respectively. The mean neck–shaft angle was 129.31° ± 5.04° in males and 129.93° ± 6.29° in females. The mean femoral anteversion was 9.72° ± 7.95° in males and 12.61° ± 8.91° in females. IFD was positively correlated with height (correlation coefficient [r] = 0.464, P < .001) and weight (0.286, P < .001), whereas it was negatively correlated with age (–0.198, P < .001), neck–shaft angle (–0.123, P = .005), and femoral anteversion (–0.346, P < .001). There was no correlation between body mass index and IFD (P = .522). In multivariate regression analysis, IFD was positively associated with height (β = .632), and negatively associated with neck–shaft angle of the femur and femoral anteversion (β = –0.155 and –0.328. respectively). Conclusions: In asymptomatic hips, the mean IFD was 33.2 ± 9.2 mm in males and 24.3 ± 8.9 mm in females. The IFD was positively correlated with height and negatively with neck–shaft angle of the femur and femoral anteversion. Level of evidence: Level III, retrospective comparative study.",
author = "Heejae Won and Lee, {Young Kyun} and Lee, {Beom Seok} and Park, {Jung Wee} and Seokhyung Won and Koo, {Kyung Hoi}",
year = "2020",
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Normal Ischiofemoral Distance and Its Associated Factors : Computed Tomography–Based Study. / Won, Heejae; Lee, Young Kyun; Lee, Beom Seok; Park, Jung Wee; Won, Seokhyung; Koo, Kyung Hoi.

In: Arthroscopy - Journal of Arthroscopic and Related Surgery, Vol. 36, No. 1, 01.2020, p. 150-155.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Normal Ischiofemoral Distance and Its Associated Factors

T2 - Computed Tomography–Based Study

AU - Won, Heejae

AU - Lee, Young Kyun

AU - Lee, Beom Seok

AU - Park, Jung Wee

AU - Won, Seokhyung

AU - Koo, Kyung Hoi

PY - 2020/1

Y1 - 2020/1

N2 - Purpose: The purposes of this study are (1) to measure the ischiofemoral distance (IFD) in nondiseased hips and (2) to reveal patient demographic and anatomical factors associated with IFD. Methods: In this retrospective study, we identified patients who had unilateral osteonecrosis of the femoral head on computed tomography (CT) scan from November 2005 to July 2018 and assessed the unaffected contralateral hips of the patients. Among the contralateral hips, we excluded hips with hip pain, incomplete or poor-quality CT image, incomplete medical record, degenerative arthritis of the hip, or previous hip surgery. IFD was measured on the axial CT image, and correlated demographic factors (age, sex, height, weight, and body mass index) and anatomical parameters (neck–shaft angle of the femur and femoral anteversion) with IFD were evaluated. Results: Five hundred seventeen patients (517 hips) were evaluated. There were 302 men and 215 women, and their mean age was 51.7 years (range 15-83 years). The mean IFD was 33.2 (±9.2) mm in men and 24.3 (±8.9) mm in women (P < .001). Interobserver and intraobserver reliability (intraclass correlation coefficients) were 0.99 (95% confidence interval 0.98-1.0) and 0.98 (95% confidence interval 0.97-0.99), respectively. The mean neck–shaft angle was 129.31° ± 5.04° in males and 129.93° ± 6.29° in females. The mean femoral anteversion was 9.72° ± 7.95° in males and 12.61° ± 8.91° in females. IFD was positively correlated with height (correlation coefficient [r] = 0.464, P < .001) and weight (0.286, P < .001), whereas it was negatively correlated with age (–0.198, P < .001), neck–shaft angle (–0.123, P = .005), and femoral anteversion (–0.346, P < .001). There was no correlation between body mass index and IFD (P = .522). In multivariate regression analysis, IFD was positively associated with height (β = .632), and negatively associated with neck–shaft angle of the femur and femoral anteversion (β = –0.155 and –0.328. respectively). Conclusions: In asymptomatic hips, the mean IFD was 33.2 ± 9.2 mm in males and 24.3 ± 8.9 mm in females. The IFD was positively correlated with height and negatively with neck–shaft angle of the femur and femoral anteversion. Level of evidence: Level III, retrospective comparative study.

AB - Purpose: The purposes of this study are (1) to measure the ischiofemoral distance (IFD) in nondiseased hips and (2) to reveal patient demographic and anatomical factors associated with IFD. Methods: In this retrospective study, we identified patients who had unilateral osteonecrosis of the femoral head on computed tomography (CT) scan from November 2005 to July 2018 and assessed the unaffected contralateral hips of the patients. Among the contralateral hips, we excluded hips with hip pain, incomplete or poor-quality CT image, incomplete medical record, degenerative arthritis of the hip, or previous hip surgery. IFD was measured on the axial CT image, and correlated demographic factors (age, sex, height, weight, and body mass index) and anatomical parameters (neck–shaft angle of the femur and femoral anteversion) with IFD were evaluated. Results: Five hundred seventeen patients (517 hips) were evaluated. There were 302 men and 215 women, and their mean age was 51.7 years (range 15-83 years). The mean IFD was 33.2 (±9.2) mm in men and 24.3 (±8.9) mm in women (P < .001). Interobserver and intraobserver reliability (intraclass correlation coefficients) were 0.99 (95% confidence interval 0.98-1.0) and 0.98 (95% confidence interval 0.97-0.99), respectively. The mean neck–shaft angle was 129.31° ± 5.04° in males and 129.93° ± 6.29° in females. The mean femoral anteversion was 9.72° ± 7.95° in males and 12.61° ± 8.91° in females. IFD was positively correlated with height (correlation coefficient [r] = 0.464, P < .001) and weight (0.286, P < .001), whereas it was negatively correlated with age (–0.198, P < .001), neck–shaft angle (–0.123, P = .005), and femoral anteversion (–0.346, P < .001). There was no correlation between body mass index and IFD (P = .522). In multivariate regression analysis, IFD was positively associated with height (β = .632), and negatively associated with neck–shaft angle of the femur and femoral anteversion (β = –0.155 and –0.328. respectively). Conclusions: In asymptomatic hips, the mean IFD was 33.2 ± 9.2 mm in males and 24.3 ± 8.9 mm in females. The IFD was positively correlated with height and negatively with neck–shaft angle of the femur and femoral anteversion. Level of evidence: Level III, retrospective comparative study.

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DO - 10.1016/j.arthro.2019.08.013

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