title: Bipolar Hemarthroplasty Using Cementless Conical Stem for Treatment of Dorr Type B and C Femoral Neck Fracture.
abstract: OBJECTIVE
  The current study aims to evaluate the clinical and the radiological outcome of bipolar hemiarthroplasty using cementless cone stem to treat osteoporotic femoral neck fracture and compare the results according to the proximal femur geometry.
  
  
  METHODS
  Seventy-five hips (75 patients) that underwent bipolar hemiarthroplasty with cementless cone stem between September 2006 and December 2011 were analyzed. The minimum follow-up period was 3 years. Thirty-three hips were classified as type B and 41 as type C. The clinical outcome was assessed using Harris hip score and the walking ability score. Radiographic evaluation was performed to evaluate the stability of the prosthesis.
  
  
  RESULTS
  At the most recent follow up, the mean Harris hip score was 86 (range, 70-92) and 65% recovered to preoperative ambulatory status. In the radiographic exam, stable stem fixation was achieved in all cases. For the complications, eight hips developed deep vein thrombosis while three hips showed heterotopic ossification. Dislocation and delayed deep infection occurred in one hip resepectively. There were no significance differences in Harris hip score and walking ability score when the type B group was compare with the type C.
  
  
  CONCLUSIONS
  Bipolar hemiarthroplasty with cementless cone stem showed an excellent early outcome both clinically and radiographically regardless of the shape of the proximal femur. We believe this prosthesis can provide early stability to the Dorr type B and C femur and is an effective treatment for treating osteoporotic femoral neck fracture.
authors.affiliation: Department of Orthopaedic Surgery, College of Medicine, Chosun University, Gwangju, Korea.
authors.forename: Jeong Hoon
authors.initials: JH
authors.lastname: Kang
authors.affiliation: Department of Orthopaedic Surgery, College of Medicine, Chosun University, Gwangju, Korea.
authors.forename: Sang Hong
authors.initials: SH
authors.lastname: Lee
authors.affiliation: Department of Orthopaedic Surgery, College of Medicine, Chosun University, Gwangju, Korea.
authors.forename: Sung
authors.initials: S
authors.lastname: Jung
keywords: Bipolar hemiarthroplasty; Cone stem; Femoral neck fractures