Description

We radiographically measured the BiPolar Cup position to analyze the direction of joint force acting on the bipolar cup. The abduction angle of the cup was measured in each radiograph taken immediately and at six 12 weeks and yearly after the operation. Radiographs in patients with weight bearing were also investigated. The results indicated that the abduction angle of the cup was 24.1 degrees +/- 11.2 degrees immediate postoperatively and was 16.2 degrees +/- 5.1 degrees at 6 weeks, 16.1 degrees +/- 5.1 degrees at 3 months, and 16.2 degrees +/- 5.1 degrees at 1 year. The cup abduction angles with weight bearing were not different from those without weight bearing and were 15.9 degrees +/- 4.9 degrees , 16.2 degrees +/- 4.4 degrees , and 16.1 degrees +/- 4.7 degrees on the supine, double-legged stance, and single-legged stance radiographs, respectively. Because the position of the cup reflects the direction of loads pivoting on it, the direction of the joint force in the frontal plane acting on the bipolar prosthesis is about 16 degrees to vertical. Shagun Cares manufacture and export BiPolar Cup and other orthopaedic instruments.

Bipolar Cup Features:

Features

• The optimal locking mechanism eliminates the risk of head dislocation.
• Ease for installment, disassemble and surgical operation.
• High-polished design reduces the wear.

Indication

• Acute traumatic fracture of the femoral head or neck

Bipolar hip arthroplasty is a good option for treating femoral neck fractures in patients more than 65 years of age, especially when they are at some surgical risk . Bipolar hip arthroplasty offers more advantageous than total hip arthroplasty in that it has a shorter operative time, less bleeding, and a lower risk of dislocation. Some contraindications (e.g., dislocation, infection), however, have been described. We report the case of intraoperative dislocation of the trial bipolar cup into the pelvis during bipolar hip arthroplasty.