title: Dynamic hip screw blade fixation for intertrochanteric hip fractures.
abstract: OBJECTIVE
  To assess the one-year outcome of a dynamic hip screw (DHS) blade in the treatment of AO/OTA 31-A1 and 31-A2 intertrochanteric hip fractures.
  
  
  METHODS
  35 men and 65 women aged 47 to 100 (mean, 83) years underwent fixation with a DHS blade for A1 (n=47) and A2 (n=53) intertrochanteric hip fractures after a low-energy injury. Patients were operated on within 48 hours of admission. Anteroposterior and lateral radiographs were examined for the tip-apex distance and femoral shortening. Potential complications were looked for, including implant migration, cut-out, loosening, or breakage. Functional outcome was based on the Parker mobility score.
  
  
  RESULTS
  The 30-day and one-year mortality rates were 5% and 20%, respectively. At the one-year follow-up, 81 patients were available, and all fractures had healed without varus deformity. The mean tip-apex distance was 14.1 (range, 5.7-31.1; SD, 4.3) mm. The mean femoral shortening was 4.9 (range, 0-20.2; SD, 4.8) mm. The mean Parker score decreased to 3.8 at one-year follow-up from 5.9 before injury (p<0.001). There was one loss of fixation secondary to a non-traumatic subcapital fracture at 3 months, for which a bipolar hemiarthroplasty was performed. CONCLUSION; The DHS blade system is effective in treating AO/OTA 31-A1 and 31-A2 intertrochanteric hip fractures and results in a low complication rate.
authors.affiliation: Department of Orthopaedics and Truamatology, Queen Mary Hospital, The University of Hong Kong, Hong Kong, China.
authors.forename: Frankie
authors.initials: F
authors.lastname: Leung
authors.forename: Paata
authors.initials: P
authors.lastname: Gudushauri
authors.forename: Grace
authors.initials: G
authors.lastname: Yuen
authors.forename: Tak-Wing
authors.initials: TW
authors.lastname: Lau
authors.forename: Christian
authors.initials: C
authors.lastname: Fang
authors.forename: Shew-Ping
authors.initials: SP
authors.lastname: Chow
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D001863:Bone Screws; D004867:Equipment Design; D005260:Female; D005593:Fracture Fixation, Internal / Q000295:instrumentation* / Q000379:methods; D006620:Hip Fractures / Q000601:surgery*; D006801:Humans; D008297:Male; D008875:Middle Aged; D009984:Orthopedic Fixation Devices; D058866:Osteoporotic Fractures / Q000601:surgery*