Browsing by Subject "Femoracetabular Impingement"
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Item Does 3DMR Provide Equivalent Information As 3DCT for the Pre-Operative Evaluation of Adult Hip Pain Conditions of Femoroacetabular Impingement and Hip Dysplasia?(2019-03-28) Yan, Kevin; Chhabra, Avneesh; Ashikyan, Oganes; Wells, JoelBACKGROUND: Femoroacetabular impingement (FAI) and hip dysplasia (HD) frequently affect young patients and are chronic pain conditions. They are frequently evaluated by isotropic CT (3DCT) for preoperative planning at the expense of radiation. OBJECTIVE: The aim was to determine if isotropic MRI (3DMR) imaging can provide similar quantitative and qualitative morphological information as 3DCT. METHODS: 25 consecutive patients with a final diagnosis of FAI or HD were retrospectively selected from December 2016-December 2017. Two readers (R1, R2) performed quantitative angular measurements on 3DCT and 3DMR, blinded to the diagnosis and each other's measurements. 3DMR and 3DCT of the hips were qualitatively and independently evaluated by a radiologist (R3), surgeon (R4), and fellow (R5). Interobserver and intermodality comparisons were performed. RESULTS: The ICC was good to excellent for all measurements between R1 and R2 (ICC:0.60-0.98) and the majority of intermodality measurements for R1 and R2. Average inter-reader and inter-modality PABAK showed good to excellent agreement for qualitative reads. On CT, all alpha angles (AA) were significantly lower in dysplasia patients than in cam patients (p<0.05). All lateral center-edge angle (LCEA) were significantly lower in dysplasia than in cam patients (p<0.05). On MR, AA at 12, 1, and 2 o'clock, and LCEA at center were significantly lower in dysplasia patients than in cam patients (p<0.05). CONCLUSION: 3DMR offers similar qualitative and quantitative analysis as 3DCT in adult hip pain conditions. 3DMR has good potential to replace 3DCT and serve as a one-stop modality for bone and soft tissue characterizations in the pre-operative evaluation of FAI and HD.Item Quantifying Differences in Femoral Head and Neck Asphericity in the Common Hip Conditions of Femoroacetabular Impingement (FAI) and Hip Dysplasia Versus Controls Using Radial 3DCT Imaging and Volumetric Segmentation(2018-01-23) Schauwecker, Natalie; Xi, Yin; Slepicka, Chenelle; Dessouky, Riham; Fey, Nicholas; Chatzinoff, Yonatan; Chopra, Rajiv; Wells, Joel; Chhabra, AvneeshAIM: 3DCT analysis of femoral head and bump anatomy in quantifying pathology in common hip conditions of FAI and hip dysplasia versus controls. Material and Methods: Consecutive patients who obtained 3DCT imaging for hip dysplasia or FAI were compared to asymptomatic controls. Alpha angles on radial CT and 3D volumetric femoral head and bump segmentations were obtained by two readers. Inter- and intra-patient comparisons were performed including inter-reader and ROC analyses. RESULTS: 25 FAI patients, 16 hip dysplasia patients and 38 controls were analyzed. FAI and dysplasia patients exhibited higher alpha angles and higher bump-head volume ratios than the controls (p<0.05). FAI patients exhibited larger bumps than dysplasia and the contralateral hips of FAI were also different than the controls. Alpha angle at 2 oメclock and bump to head ratio showed the highest area under the curve for cases versus controls. The reader reliability was better for volumetric segmentation (ICC= 0.35-0.84) as compared to the alpha angles (ICC= 0.11-0.44). CONCLUSION: Patients with both FAI and dysplasia exhibit different femoral head anatomy than the asymptomatic controls. Volumetric segmentation of femoral head and bump is more reliable and better demonstrates the bilateral femoral head anatomy differences of cases versus controls.