Abstract:

BACKGROUND: The new generation of Tri-Lock bone preservation stem (BPS) femoral stem prosthesis is further improved. But it’s design features and surgical techniques are still rarely reported.
OBJECTIVE: To summarize design features and clinical application of the Tri-Lock BPS in total hip arthroplasty (THA).
METHODS: Totally nine patients (10 hips) were treated with THA using Tri-Lock BPS. Eight patients were diagnosed preoperatively with femoral head necrosis, while the other one with osteoarthritis. The preoperative and postoperative hip functions and postoperative biological fixation of femoral stem prosthesis were evaluated by Harris and Engh score. Postoperative initial fixation quality of the femoral stem prosthesis was evaluated by Healy score. The incidence of radiolucent line and osteolysis was analyzed. Bone ingrowth of acetabulum and femoral side was described respectively by Delee and Gruen. Subsidence of the femoral stem prosthesis was measured by D’Antonio. Femoral area pain was evaluated by 10-point visual analogue score.
RESULTS AND CONCLUSION: X-ray of the ten hips showed that the femoral stem prosthesis was in line with good initial fixed standard. At 3 months after surgery, the mean postoperative Harris hip score was 92 (range 85 to 96). No one had thigh pain. There was no prosthesis loosening. The results showed that the design of Tri-Lock BPS is more in line with characteristics of human anatomy, and has the advantages in rapid recovery of hip function and retains more bone mass.