title: Lesion of the hip abductor mechanism.
abstract: BACKGROUND
  The disruption of the abductor muscles of the hip after hip revision surgery often causes limping, pain, and instability of the implant. The purpose of our paper is to describe a mesh technique to repair hip abductor mechanism injuries after hip revision.
  
  
  METHODS
  Forty-six patients with hip abductor damage after prosthetic revision were treated. Inclusion criteria were: patients presenting with prosthetic loosening, complaint of pain, and with a positive Trendelenburg sign due to deficient abductor muscle mechanisms. Thirty-one were women (67.39%) with an average age of 64 years (34-82 years). The number of previous revision surgeries was three (two to seven). The Merle d'Aubigné score and variants before and after treatment were also reported.
  
  
  RESULTS
  In the postoperative follow-up after hip revision with the mesh technique, the Merle d'Aubigné score improved and the Trendelenburg sign was negative in 78.3% of the patients (p < 0.001). Also, the Trendelenburg test with the knee flexed was negative in 60.9% (p < 0.001) and the stair-climbing test was negative in 60.9% of cases (p < 0.001). The gluteus medius test in the lateral position was negative in 52.2% of patients, and in the lateral position with the knee flexed it was negative in 47.8% of patients (p < 0.001).
  
  
  CONCLUSIONS
  Repair of the abductor mechanism with the mesh technique has proven effective for both partial and total lesions.
authors.affiliation: Orthopaedic and Traumatology Department, General Hospital Dr. Juan A. Fernández, Buenos Aires, Argentina.
authors.forename: Horacio
authors.initials: H
authors.lastname: Caviglia
authors.affiliation: Orthopaedic and Traumatology Department, General Hospital Dr. Juan A. Fernández, Buenos Aires, Argentina.
authors.forename: Guillermo
authors.initials: G
authors.lastname: Cambiaggi
authors.affiliation: Orthopaedic and Traumatology Department, General Hospital Dr. Juan A. Fernández, Buenos Aires, Argentina.
authors.forename: Nosrat
authors.initials: N
authors.lastname: Vattani
authors.affiliation: Orthopaedic and Traumatology Department, General Hospital Dr. Juan A. Fernández, Buenos Aires, Argentina.
authors.forename: María Eulalia
authors.initials: ME
authors.lastname: Landro
authors.affiliation: Orthopaedic and Traumatology Department, General Hospital Dr. Juan A. Fernández, Buenos Aires, Argentina.
authors.forename: Gustavo
authors.initials: G
authors.lastname: Galatro