Fig. 1 A-E.

The concept of the experimental, ovine FAI model is shown. (A) A normal femoral head with a spherical shape. (B) The femoral head is aspherical in patients with a cam deformity similar to the (C) physiological shape of the ovine femoral head. (D) A cam-type FAI can be experimentally induced through an extraarticular closed-wedge osteotomy. (E) To simulate corrective surgery similar to FAI in humans, an offset correction can be performed. Reprinted from Osteoarthritis Cartilage, volume 26/edition 1, Schmaranzer F, Arendt L, Lerch TD, Steppacher SD, Nuss K, Wolfer N, Dawson HE, von Rechenberg B, Kircher PR, Tannast M. Femoral osteochondroplasty can be performed effectively without the risk of avascular necrosis or femoral neck fractures in an experimental ovine FAI model, pages 128–137, Copyright 2018, with permission from Elsevier.