title: Arthroscopic osteochondroplasty in patients with mild slipped capital femoral epiphysis after in situ fixation.
abstract: OBJECTIVE
  Mild slipped capital femoral epiphyses (SCFE) nevertheless show significant femoral head-neck deformities which may put cartilage and acetabular labrum at risk. Whether this deformity can be restored to normal has not yet been described in the literature.
  
  
  METHODS
  In a prospective follow-up study, 14 patients with mild SCFE underwent in situ fixation with a single 6.5-mm cancellous, partially threaded screw. In 14 patients arthroscopic osteochondroplasty was performed, and in 13 patients pre- and postoperative measurements of the α-angle were made using antero-superior radial magnetic resonance imaging.
  
  
  RESULTS
  After arthroscopic osteochondroplasty, the mean α-angle decreased from 57° (range 50°-74°) to 37° (range 32°-47°; p < 0.001). Six patients showed beginning degenerative intra-articular changes (four antero-superior cartilage and three antero-superior labrum lesions) at the time of hip arthroscopy. No intra-operative complications occurred. In one patient, arthroscopic debridement was necessary due to arthrofibrosis and persistent pain.
  
  
  CONCLUSIONS
  Arthroscopic osteochondroplasty can successfully correct the antero-superior α-angle in patients with mild SCFE to normal values. Clinical randomized controlled studies with long-term follow-up are required to find evidence of improved functional and radiographic mid- and long-term outcome compared to in situ fixation alone.
authors.affiliation: Department of Orthopaedics, Balgrist University Hospital, University of Zurich, Forchstrasse 340, 8008, Zurich, Switzerland. ph.tscholl@sunrise.ch.
authors.forename: Philippe M
authors.initials: PM
authors.lastname: Tscholl
authors.affiliation: Department of Orthopaedics, Balgrist University Hospital, University of Zurich, Forchstrasse 340, 8008, Zurich, Switzerland.
authors.forename: Patrick O
authors.initials: PO
authors.lastname: Zingg
authors.affiliation: Department of Orthopaedics, Balgrist University Hospital, University of Zurich, Forchstrasse 340, 8008, Zurich, Switzerland.
authors.forename: Claudio
authors.initials: C
authors.lastname: Dora
authors.affiliation: Department of Orthopaedics, Balgrist University Hospital, University of Zurich, Forchstrasse 340, 8008, Zurich, Switzerland.
authors.forename: Eric
authors.initials: E
authors.lastname: Frey
authors.affiliation: Orthopaedic Division, Department of Surgery, University Children's Hospital, University Hospital of Zurich, Zurich, Switzerland.
authors.forename: Stefan
authors.initials: S
authors.lastname: Dierauer
authors.affiliation: Orthopaedic Division, Department of Surgery, University Children's Hospital, University Hospital of Zurich, Zurich, Switzerland.
authors.forename: Leonhard E
authors.initials: LE
authors.lastname: Ramseier
keywords: FAI; Femoro-acetabular impingement; Magnetic resonance tomography; Osteoarthritis; Osteochondroplasty; Slipped capital femoral epiphysis