title: The frequency of sequelae of slipped upper femoral epiphysis in cam-type femoroacetabular impingement.
abstract: Slipped upper femoral epiphysis (SUFE) is one of the known causes of cam-type femoroacetabular impingement (FAI). The aim of this study was to determine the proportion of FAI cases considered to be secondary to SUFE-like deformities. We performed a case-control study on 96 hips (75 patients: mean age 38 years (15.4 to 63.5)) that had been surgically treated for FAI between July 2005 and May 2011. Three independent observers measured the lateral view head-neck index (LVHNI) to detect any SUFE-like deformity on lateral hip radiographs taken in 45° flexion, 45° abduction and 30° external rotation. A control group of 108 healthy hips in 54 patients was included for comparison (mean age 36.5 years (24.3 to 53.9). The impingement group had a mean LVHNI of 7.6% (16.7% to -2%) versus 3.2% in the control group (10.8% to -3%) (p < 0.001). A total of 42 hips (43.7%) had an index value > 9% in the impingement group versus only six hips (5.5%) in the control group (p < 0.001). The impingement group had a mean α angle of 73.9° (96.2° to 53.4°) versus 48.2° (65° to 37°) in the control group (p < 0.001). Our results suggest that SUFE is one of the primary aetiological factors for cam-type FAI.
authors.affiliation: Pierre Paul Riquet Hospita, Orthopaedics and Trauma Surgery, Musculoskeletal Institute, 308 avenue de Grande Bretagne, 31059, Toulouse, France.
authors.forename: J
authors.initials: J
authors.lastname: Murgier
authors.affiliation: Pierre Paul Riquet Hospita, Orthopaedics and Trauma Surgery, Musculoskeletal Institute, 308 avenue de Grande Bretagne, 31059, Toulouse, France.
authors.forename: N
authors.initials: N
authors.lastname: Reina
authors.affiliation: Pierre Paul Riquet Hospita, Orthopaedics and Trauma Surgery, Musculoskeletal Institute, 308 avenue de Grande Bretagne, 31059, Toulouse, France.
authors.forename: E
authors.initials: E
authors.lastname: Cavaignac
authors.affiliation: Pierre Paul Riquet Hospita, Orthopaedics and Trauma Surgery, Musculoskeletal Institute, 308 avenue de Grande Bretagne, 31059, Toulouse, France.
authors.forename: A
authors.initials: A
authors.lastname: Espié
authors.affiliation: Pierre Paul Riquet Hospita, Orthopaedics and Trauma Surgery, Musculoskeletal Institute, 308 avenue de Grande Bretagne, 31059, Toulouse, France.
authors.forename: X
authors.initials: X
authors.lastname: Bayle-Iniguez
authors.affiliation: Pierre Paul Riquet Hospita, Orthopaedics and Trauma Surgery, Musculoskeletal Institute, 308 avenue de Grande Bretagne, 31059, Toulouse, France.
authors.forename: P
authors.initials: P
authors.lastname: Chiron
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D001858:Bone Nails; D016022:Case-Control Studies; D004838:Epiphyses / Q000000981:diagnostic imaging / Q000601:surgery; D005260:Female; D057925:Femoracetabular Impingement / Q000000981:diagnostic imaging* / Q000503:physiopathology / Q000601:surgery*; D005270:Femur Head / Q000000981:diagnostic imaging / Q000601:surgery*; D006801:Humans; D008297:Male; D008875:Middle Aged; D019637:Orthopedic Procedures / Q000379:methods*; D010147:Pain Measurement; D016059:Range of Motion, Articular / Q000502:physiology; D012016:Reference Values; D015203:Reproducibility of Results; D012189:Retrospective Studies; D018570:Risk Assessment; D012720:Severity of Illness Index; D012737:Sex Factors; D018709:Statistics, Nonparametric; D014057:Tomography, X-Ray Computed / Q000379:methods; D016896:Treatment Outcome; D055815:Young Adult
keywords: Femoro acetabular impingement; Head neck index; Hip disease; Lateral view