Abstract：
OBJECTIVE: To characterize hip capsule thickness on advanced imaging in patients with and without hip dysplasia and to also evaluate differences in capsular thickness between borderline and true dysplastic patients.
METHODS: Patients evaluated by the senior author for concerns of hip pathology from June 2020 to June 2021 were queried and images reviewed to determine dysplasia status by lateral center edge angle (LCEA) ≤ 25 degrees. A group of non-dysplastic patients was identified and matched for age, sex, and body mass index (BMI). Hip capsular thickness was quantified using MRI. A sub-analysis was conducted to compare true dysplastic patients (LCEA < 20°) to borderline dysplastic patients (LCEAs between 20 - 25°). Analysis included independent samples t-tests, Chi-square tests, and multivariable regression.
RESULTS: Eighty total patients were included, with a mean age of 31.8 ± 11.7 years, a mean BMI of 26.6 ± 6.5 points, and 70% (56) female patients. Dysplastic patients had a mean LCEA of 19.8 ± 4.3 degrees. Dysplastic individuals had decreased capsular thickness compared to their non-dysplastic controls (2.75 ± 0.96 vs 3.52 ± 1.22 mm, p = 0.003). Multivariable regression showed decreased capsular thickness associated with decreased LCEAs (β = 2.804, R = 0.432, p<0.001) and dysplasia (β = -0.709, R2 = 0.056, p = 0.004). Results of a sub-analysis of the dysplastic group examining differences between accepted definitions of borderline dysplasia and true dysplasia showed no significant differences in capsular thickness between the two groups (p = 0.379).
CONCLUSIONS: Patients with hip dysplasia were found to have thinner iliofemoral ligaments in the coronal plane on magnetic resonance imaging on magnetic resonance imaging. Further investigation is needed to evaluate any potential implications with hip instability given the thinner hip capsule demonstrated in this study.
METHODS: Patients evaluated by the senior author for concerns of hip pathology from June 2020 to June 2021 were queried and images reviewed to determine dysplasia status by lateral center edge angle (LCEA) ≤ 25 degrees. A group of non-dysplastic patients was identified and matched for age, sex, and body mass index (BMI). Hip capsular thickness was quantified using MRI. A sub-analysis was conducted to compare true dysplastic patients (LCEA < 20°) to borderline dysplastic patients (LCEAs between 20 - 25°). Analysis included independent samples t-tests, Chi-square tests, and multivariable regression.
RESULTS: Eighty total patients were included, with a mean age of 31.8 ± 11.7 years, a mean BMI of 26.6 ± 6.5 points, and 70% (56) female patients. Dysplastic patients had a mean LCEA of 19.8 ± 4.3 degrees. Dysplastic individuals had decreased capsular thickness compared to their non-dysplastic controls (2.75 ± 0.96 vs 3.52 ± 1.22 mm, p = 0.003). Multivariable regression showed decreased capsular thickness associated with decreased LCEAs (β = 2.804, R = 0.432, p<0.001) and dysplasia (β = -0.709, R2 = 0.056, p = 0.004). Results of a sub-analysis of the dysplastic group examining differences between accepted definitions of borderline dysplasia and true dysplasia showed no significant differences in capsular thickness between the two groups (p = 0.379).
CONCLUSIONS: Patients with hip dysplasia were found to have thinner iliofemoral ligaments in the coronal plane on magnetic resonance imaging on magnetic resonance imaging. Further investigation is needed to evaluate any potential implications with hip instability given the thinner hip capsule demonstrated in this study.
摘要：
目的：对有和没有髋关节发育不良的患者进行高级影像学检查以确定髋关节囊厚度，并评估临界型和真正的发育不良患者之间的囊厚度差异。
方法：对由资深作者评估的2020年6月至2021年6月髋关节病理学关注的患者进行了查询，并回顾了图像，以通过外侧中心边缘角（LCEA）≤25度确定发育不良状态。确定了一组未发育异常的患者，并进行了年龄匹配，性别,体重指数（BMI）。使用MRI定量髋关节囊厚度。进行子分析以比较真实的发育不良患者（LCEA<20°）与临界发育不良患者（LCEA在20-25°之间）。分析包括独立样本t检验，卡方检验,和多元回归。
结果：共纳入80例患者，平均年龄为31.8±11.7岁，平均BMI为26.6±6.5分，70％（56）女性患者。发育不良患者的平均LCEA为19.8±4.3度。与未发育异常的对照组相比，发育异常的个体的囊膜厚度降低（2.75±0.96vs3.52±1.22mm，p=0.003)。多因素回归分析显示，包膜厚度减少与LCEA减少（β=2.804，R=0.432，p<0.001）和发育不良（β=-0.709，R2=0.056，p=0.004）相关。对发育异常组进行的子分析检查了公认的边界发育异常和真正发育异常的定义之间的差异，结果显示两组之间的囊膜厚度没有显着差异（p=0.379）。
结论：在磁共振成像中，发现髋关节发育不良患者的冠状面有较薄的髂股韧带。鉴于本研究中显示的较薄的髋关节囊，需要进一步研究以评估与髋关节不稳定的任何潜在影响。
方法：对由资深作者评估的2020年6月至2021年6月髋关节病理学关注的患者进行了查询，并回顾了图像，以通过外侧中心边缘角（LCEA）≤25度确定发育不良状态。确定了一组未发育异常的患者，并进行了年龄匹配，性别,体重指数（BMI）。使用MRI定量髋关节囊厚度。进行子分析以比较真实的发育不良患者（LCEA<20°）与临界发育不良患者（LCEA在20-25°之间）。分析包括独立样本t检验，卡方检验,和多元回归。
结果：共纳入80例患者，平均年龄为31.8±11.7岁，平均BMI为26.6±6.5分，70％（56）女性患者。发育不良患者的平均LCEA为19.8±4.3度。与未发育异常的对照组相比，发育异常的个体的囊膜厚度降低（2.75±0.96vs3.52±1.22mm，p=0.003)。多因素回归分析显示，包膜厚度减少与LCEA减少（β=2.804，R=0.432，p<0.001）和发育不良（β=-0.709，R2=0.056，p=0.004）相关。对发育异常组进行的子分析检查了公认的边界发育异常和真正发育异常的定义之间的差异，结果显示两组之间的囊膜厚度没有显着差异（p=0.379）。
结论：在磁共振成像中，发现髋关节发育不良患者的冠状面有较薄的髂股韧带。鉴于本研究中显示的较薄的髋关节囊，需要进一步研究以评估与髋关节不稳定的任何潜在影响。
