title: Treatment of avascular necrosis of the femoral head in small dogs with micro total hip replacement.
abstract: OBJECTIVE
  To evaluate clinical outcome of small dogs with avascular necrosis (AVN) of the femoral head treated with Micro total hip replacement (THR).
  
  
  METHODS
  Nonrandomized, retrospective efficacy case series.
  
  
  METHODS
  Dogs (n = 7; 7 hips) that had Micro THR.
  
  
  METHODS
  Medical records (December 2005-March 2009) of dogs affected with AVN treated with Micro THR were reviewed. Data analysis included age, sex, breed, body weight, and body condition. All dogs were evaluated at least 6 months after Micro THR was performed on the affected AVN limb. Physical, orthopedic, and radiographic examination, owner questionnaire, thigh girth, and ground reaction force were evaluated.
  
  
  RESULTS
  Seven dogs (7 Micro THR) met the inclusion criteria. Mean age at time of onset of clinical signs was 7.7 months and mean age at time of Micro THR was 9.6 months. Mean body weight was 4.2 kg. Median body condition score was 5.0 (range, 4-6). Mean cumulative functional scores from client questionnaires before (19.5; range, 11-25) and after Micro THR (8.2; range, 7-14) were significantly different (P = .004). There was no significant difference between thigh girths of the Micro THR (17.8 ± 2.6 cm; range, 14.5-21.5 cm) limbs when compared with contralateral (17.5 ± 2.9 cm; range, 14.5-22.0 cm) limbs (P = .38). Peak vertical force (P = .20), vertical impulse (P = .81), peak braking force (P = .91), braking impulse (P = .19), peak propulsion force (P = .32), and propulsion impulse (P = .19) were not significantly different in Micro THR limbs compared with contralateral limbs.
  
  
  CONCLUSIONS
  There was no relationship between age, sex, and breed for development of AVN in this study. Dogs that received Micro THR for the treatment of AVN had no significant differences in thigh girth and ground reaction forces when Micro THR limb was compared with the contralateral limb.
authors.affiliation: Gulf Coast Veterinary Specialists, Houston, TX, USA. djankovits@yahoo.com
authors.forename: Daniel A
authors.initials: DA
authors.lastname: Jankovits
authors.forename: William D
authors.initials: WD
authors.lastname: Liska
authors.forename: Russell H
authors.initials: RH
authors.lastname: Kalis
mesh_terms: D000818:Animals; D019644:Arthroplasty, Replacement, Hip / Q000662:veterinary*; D049628:Body Size; D004283:Dog Diseases / Q000601:surgery*; D004285:Dogs; D005260:Female; D005271:Femur Head Necrosis / Q000601:surgery / Q000662:veterinary*; D008297:Male; D012189:Retrospective Studies