title: Cementless total hip replacement with subtrochanteric femoral shortening for severe developmental dysplasia of the hip.
abstract: BACKGROUND
  Total joint replacement in patients suffering from developmental dysplasia of the hip poses specific technical difficulties due to insufficient bone stock at the site of the original and secondary acetabulum and a narrow, cranially displaced proximal femur.
  
  
  METHODS
  Twelve hips with severe congenital dislocation (4 Crowe type II, 5 type III, 3 type IV) were treated with cementless, porous structured total hip replacement. The cup was implanted at the anatomic height, a femoral segment was resected below the minor trochanter to reduce the femoral component in all cases.
  
  
  RESULTS
  One femoral component was exchanged for a longer stem after 2 months due to insufficient fit and fill. After a mean follow-up of 5.1 years, there were no further revisions or radiographic signs of loosening. No cup was revised or loose radiographically. Harris hip score (mean) improved from 36 to 82 points, mean leg length discrepancy was reduced from 5.4 to 1.3 cm.
  
  
  CONCLUSIONS
  The cementless technique described is useful in cases of severe congenital dislocation of the hip when the cup is implanted at the anatomic level, and implant reduction is not possible despite thorough soft-tissue release or not advisable because of excessive limb lengthening. A reconstruction of the original joint center and good mid-term results are demonstrated.
authors.affiliation: Department of Orthopaedic Surgery, Johannes Gutenberg University School of Medicine, Langenbeckstrasse 1, 55101 Mainz, Germany. decking@mail.uni-mainz.de
authors.forename: Jens
authors.initials: J
authors.lastname: Decking
authors.forename: Ralf
authors.initials: R
authors.lastname: Decking
authors.forename: Carsten
authors.initials: C
authors.lastname: Schoellner
authors.forename: Sebastian
authors.initials: S
authors.lastname: Fuerderer
authors.forename: Jan D
authors.initials: JD
authors.lastname: Rompe
authors.forename: Anke
authors.initials: A
authors.lastname: Eckardt
mesh_terms: D000328:Adult; D019644:Arthroplasty, Replacement, Hip / Q000379:methods*; D005260:Female; D005269:Femur / Q000601:surgery; D006618:Hip Dislocation, Congenital / Q000000981:diagnostic imaging / Q000601:surgery*; D006801:Humans; D008297:Male; D008875:Middle Aged; D011859:Radiography