Blümel, Stefan Hanauer, Matthieu Franken, Veerle Schwab, Joseph M. Tannast, Moritz 2023-08-19 Valgus intertrochanteric osteotomy is a well-established treatment in delayed union of femoral neck fractures as it converts shear forces into compression forces. Non-union of the femoral neck fracture may persist following valgus intertrochanteric osteotomy, and secondary femoroacetabular impingement (FAI) may be a contributing factor. Case We report one case of persistent femoral neck non-union after treatment by valgus intertrochanteric osteotomy with concomitant secondary cam-type impingement from fracture callus as a possible cause for ongoing insufficient healing. Healing was achieved following surgical hip dislocation with corrective osteochondroplasty of the femoral head-neck junction. Two-year follow-up shows good clinical and radiological outcomes. Conclusion In ongoing non-healing of femoral neck fractures following valgus intertrochanteric osteotomy, secondary cam impingement from fracture callus must be excluded. application/pdf https://folia.unifr.ch/global/documents/325988 https://folia.unifr.ch/documents/325988/files/1-s2.0-s2352644023001589-main.pdf eng info:eu-repo/semantics/altIdentifier/doi/10.1016/j.tcr.2023.100911 info:eu-repo/semantics/altIdentifier/issn/2352-6440 info:eu-repo/semantics/openAccess CC BY Trauma Case Reports. - Elsevier BV. - 2023, vol. 47, p. 100911 Critical Care and Intensive Care Medicine Orthopedics and Sports Medicine Emergency Medicine Femoral neck fracture Valgus intertrochanteric osteotomy Femoroacetabular impingement FAI Secondary cam-type femoroacetabular impingement Surgical hip dislocation info:eu-repo/classification/udc/616 Persistent femoral neck non-union despite valgus intertrochanteric osteotomy: Relevance for secondary cam-type impingement http://purl.org/coar/resource_type/c_6501