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Congress: ECR25
Poster Number: C-13511
Type: Poster: EPOS Radiologist (scientific)
Authorblock: T. D. Lerch, T. Kaim, M. K. Meier, S. Steppacher, M. Tannast, F. Schmaranzer; Bern/CH
Disclosures:
Till Dominic Lerch: Nothing to disclose
Tilman Kaim: Nothing to disclose
Malin Kristin Meier: Nothing to disclose
Simon Steppacher: Nothing to disclose
Moritz Tannast: Nothing to disclose
Florian Schmaranzer: Nothing to disclose
Keywords: Musculoskeletal bone, CT, Arthrography, Dysplasias
Purpose Femoroacetabular Impingement (FAI) was associated with anterior hip pain and premature osteoarthritis in young patients[1,2]. Pincer-type FAI was described as an early osseous conflict of a prominent acetabular rim with the proximal femur[1,2]. Pincer-type FAI can be caused by global acetabular overcoverage or focal prominent overgrowth of the anterior acetabular wall[3]. Acetabular retroversion is an additional cause for pincer-type FAI[4,5]. Initially, the surgical treatment for pincer-type FAI due to acetabular retroversion was acetabular rim trimming during hip arthroscopy[3] or open...
Read more Methods and materials     Methods or Background A retrospective, IRB-approved, controlled study including 120 hips of consecutive patients with symptomatic FAI or hip-dysplasia was performed. Sagittal images of Pelvic CT scans were reviewed for all hips to calculate parameters for sagittal balance (PI, SS and pelvic tilt). Frequency of patients with PI<40°, SS<35° and Frequency types of sacral slope (Type 1-4 according to Roussouly classification) was analysed. The patients were allocated to the following groups: AR(41 hips), hip-dysplasia(47 hips) and hips with cam-FAI with normal...
Read more Results (1)Frequency of PI<40° was significantly(p<0.001) increased in patients with AR(44%) or total acetabular retroversion (73%) compared to hip dysplasia(11%).(2)Frequency of SS<35° (Type 1 or 2) was higher (29%) of the patients with AR compared to patients with hip dysplasia (11%).(3)Frequency of SS>45° (Type 4) was significantly(p<0.001) higher of the patients with hip dysplasia (49%) and with high anteversion (55%) compared to patients with AR (12%) and total AR (0%). 
Read more Conclusion Increased SS was associated with hip dysplasia and high anteversion. While increased SS was associated with increased lumbar lordosis. This could help to better understand low back pain. AR was associated with low PI, similar to LPC (lumbo-pelvic-complex) type 1. Patients with FAI and hip dysplasia have different hip-spine relation and sagittal balance. 
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