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Femoral osteochondroplasty can be performed effectively without the risk of avascular necrosis or femoral neck fractures in an experimental ovine FAI model.
Schmaranzer, F; Arendt, L; Lerch, T D; Steppacher, S D; Nuss, K; Wolfer, N; Dawson, H E; von Rechenberg, B; Kircher, P R; Tannast, M.
Afiliación
  • Schmaranzer F; Department of Orthopaedic Surgery, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland. Electronic address: florian.schmaranzer@insel.ch.
  • Arendt L; Musculoskeletal Research Unit (MSRU), Equine Hospital, Vetsuisse Faculty, University of Zürich, Zürich, Switzerland.
  • Lerch TD; Department of Orthopaedic Surgery, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland.
  • Steppacher SD; Department of Orthopaedic Surgery, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland.
  • Nuss K; Musculoskeletal Research Unit (MSRU), Equine Hospital, Vetsuisse Faculty, University of Zürich, Zürich, Switzerland.
  • Wolfer N; Musculoskeletal Research Unit (MSRU), Equine Hospital, Vetsuisse Faculty, University of Zürich, Zürich, Switzerland.
  • Dawson HE; Institute of Pathology, University of Bern, Bern, Switzerland.
  • von Rechenberg B; Musculoskeletal Research Unit (MSRU), Equine Hospital, Vetsuisse Faculty, University of Zürich, Zürich, Switzerland.
  • Kircher PR; Department of Small Animals, Division of Diagnostic Imaging, Vetsuisse Faculty, University of Zürich, Zürich, Switzerland.
  • Tannast M; Department of Orthopaedic Surgery, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland; Musculoskeletal Research Unit (MSRU), Equine Hospital, Vetsuisse Faculty, University of Zürich, Zürich, Switzerland.
Osteoarthritis Cartilage ; 26(1): 128-137, 2018 01.
Article en En | MEDLINE | ID: mdl-29061495
OBJECTIVE: The experimental induction of cam-type femoroacetabular impingement (FAI) in sheep is established. To tap the full potential of this ovine model, one should be able to perform a femoral osteochondroplasty safely. This study was based on previous cadaver experiments on the blood supply to the ovine femoral head and on the biomechanical strength of the proximal femur following offset creation. We hypothesized that offset creation in this ovine FAI model does not lead to (1) avascular necrosis (AVN) of the ovine femoral head or (2) iatrogenic femoral neck fractures and (3) can be performed effectively. DESIGN: In this experimental, controlled, prospective study nine sheep underwent unilateral FAI induction through an intertrochanteric, varus osteotomy. Seventy days following FAI induction, femoral osteochondroplasty was performed. Sheep were sacrificed after another 140 days. Radiographs, computed tomography (CT) scans and MRI were acquired. Histologic samples were stained with hematoxylin-eosin. (1) The multimodal Association Research Circulation Osseous (ARCO) classification was used for assessment of AVN. (2) Femoral neck fractures were assessed with the multimodal imaging approach. (3) Pre- and postoperative (=after sacrifice) alpha angles and femoral neck diameters were compared. RESULTS: (1) No signs for AVN according to the ARCO classification or (2) for femoral neck fractures were detected. (3) Mean alpha angles and femoral neck diameters decreased significantly (p < 0.001) superiorly by at least 30° respectively 4 mm after the offset creation. CONCLUSIONS: Femoral osteochondroplasty can be performed effectively and without the risk of AVN or femoral neck fractures in this ovine FAI model.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Procedimientos Ortopédicos / Fracturas del Cuello Femoral / Necrosis de la Cabeza Femoral / Pinzamiento Femoroacetabular Tipo de estudio: Etiology_studies / Observational_studies / Prognostic_studies / Risk_factors_studies Límite: Animals Idioma: En Revista: Osteoarthritis Cartilage Asunto de la revista: ORTOPEDIA / REUMATOLOGIA Año: 2018 Tipo del documento: Article Pais de publicación: Reino Unido
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Procedimientos Ortopédicos / Fracturas del Cuello Femoral / Necrosis de la Cabeza Femoral / Pinzamiento Femoroacetabular Tipo de estudio: Etiology_studies / Observational_studies / Prognostic_studies / Risk_factors_studies Límite: Animals Idioma: En Revista: Osteoarthritis Cartilage Asunto de la revista: ORTOPEDIA / REUMATOLOGIA Año: 2018 Tipo del documento: Article Pais de publicación: Reino Unido