naa a22 4500 510760538 CHVBK 20180411083137.0 cr unu---uuuuu 180411e20130701xx s 000 0 eng 10.1007/s11420-012-9325-5 doi (NATIONALLICENCE)springer-10.1007/s11420-012-9325-5 Incidence of Radiographic Cam-Type Impingement in Young Patients (<50) After Femoral Neck Fracture Treated with Reduction and Internal Fixation [Elektronische Daten] [Matthew Wendt, Joseph Cass, Robert Trousdale] Background:: Cam-type femoral impingement is caused by structural abnormalities of the hip and is recognized as a cause of degenerative hip arthritis. Identifiable etiologies of this structural abnormality include congenital malformation, pediatric hip disease, and malunion of femoral neck fractures after internal fixation. Purpose:: The purpose of this study was to determine the prevalence of radiographic impingement in healed Orthopaedic Trauma Association (OTA) type 31B fractures treated with reduction and internal fixation. Methods:: Seventy OTA 31B hip fractures treated with internal fixation were identified from our institutional trauma database and radiographs were retrospectively reviewed for signs of impingement. Mean follow-up was 53months after fracture. Alpha angle, Mose templates, and femoral head retroversion were the measurements used to determine impingement. Results:: The overall prevalence of any sign of radiographic impingement was 75%. Alpha angle was elevated in 32 hips (46%), asphericity was present in 46 femoral heads (65%), and femoral head retroversion was present in 26 hips (37%). The rates were highest in displaced subcapital fractures (OTA 31B-3) with a 63% (13/19) prevalence of elevated alpha angle, 68% (14/19) prevalence of asphericity, and 47% (10/19) prevalence of retroversion. Conclusions:: Prevalence of radiographic signs of impingement in this population is higher than expected based on population-based controls. Surgeons must be vigilant about reduction and fixation of femoral neck fractures. Malunion should be recognized as early intervention may be beneficial in improving long-term outcomes. Hospital for Special Surgery, 2013 femoroacetabular impingement nationallicence femoral neck fracture nationallicence alpha angle nationallicence cam lesion nationallicence Wendt Matthew Mayo Clinic, 200 First Street SW, 55905, Rochester, MN, USA aut Cass Joseph Mayo Clinic, 200 First Street SW, 55905, Rochester, MN, USA aut Trousdale Robert Mayo Clinic, 200 First Street SW, 55905, Rochester, MN, USA aut HSS Journal ® Springer US; http://www.springer-ny.com 9/2(2013-07-01), 113-117 1556-3316 9:2<113 2013 9 11420 https://doi.org/10.1007/s11420-012-9325-5 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11420-012-9325-5 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Wendt Matthew Mayo Clinic, 200 First Street SW, 55905, Rochester, MN, USA aut NATIONALLICENCE 700 1- Cass Joseph Mayo Clinic, 200 First Street SW, 55905, Rochester, MN, USA aut NATIONALLICENCE 700 1- Trousdale Robert Mayo Clinic, 200 First Street SW, 55905, Rochester, MN, USA aut NATIONALLICENCE 773 0- HSS Journal ® Springer US; http://www.springer-ny.com 9/2(2013-07-01), 113-117 1556-3316 9:2<113 2013 9 11420 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer