title: REVISION TOTAL HIP ARTHROPLASTY USING A MODULAR CEMENTLESS DISTAL FIXATION PROSTHESIS: THE ZMR(®) HIP SYSTEM. CLINICAL AND RADIOGRAPHIC ANALYSIS OF 30 CASES.
abstract: OBJECTIVE
  To evaluate the clinical and radiographic results from 30 cases of revision of total hip arthroplasty using a modular cementless distal fixation prosthesis: the ZMR(®) Hip System.
  
  
  METHODS
  Between July 2005 and December 2008, 30 operations were performed, on 14 men and 14 women. Two male patients had bilateral surgery. The mean age was 59.2 years (29-81 years), with a mean follow-up of 24 months. The Paprosky classification was used for periprosthetic bone loss, and the Harris Hip Score (HHS) was used to evaluate clinical results. On radiographs, distal migration of the femoral stem was defined in accordance with Sporer. Proximal bone remodeling was classified using the Callaghan criteria.
  
  
  RESULTS
  The mean preoperative HHS was 39, and there was a significant increase to 93 points in the final evaluation, which indicated excellent clinical results. No femoral stem migration greater than 5 mm (Sporer) was observed on radiographs, thus suggesting that all the femoral prostheses presented osseointegration and remained stable from the time of the surgery until the final evaluation. The proximal femoral remodeling was either type B or type C in 29 hips, according to Callaghan. Seven patients had complications, but without interfering with osseointegration of the femoral components.
  
  
  CONCLUSIONS
  Our results from revision of total hip arthroplasty using the ZMR(®) Hip System were extremely encouraging, and all the components became osseointegrated and remained fixed at the time of the final evaluation.
authors.affiliation: Orthopedist; Postgraduate of Hip and Knee Surgery from HC-UFPR. Preceptor of Medical Residence in Orthopedics and Traumatology and member of the Hip Surgery Group, HGCR, Florianópolis, SC.
authors.forename: Richard Prazeres
authors.initials: RP
authors.lastname: Canella
authors.affiliation: MSc. Orthopedist and Head of the Hip and Knee Surgery Group, Hospital de Clínicas, UFPR, Curitiba, PR.
authors.forename: Paulo Gilberto Cimbalista
authors.initials: PG
authors.lastname: de Alencar
authors.affiliation: PhD. Preceptor of Medical Residence in Orthopedics and Traumatology and member of the Bone Tumor Group, HGCR, Florianópolis, SC.
authors.forename: Gerson Gandhi
authors.initials: GG
authors.lastname: Ganev
authors.affiliation: Orthopedist and Preceptor of Medical Residence in Orthopedics and Traumatology and member of the Bone Tumor Group, HGCR, Florianópolis, SC.
authors.forename: Luiz Fernando
authors.initials: LF
authors.lastname: de Vincenzi
keywords: Adult; Arthroplasty, hip; Hip prosthesis; Retrospective studies