Application Of Tri-lock Bone Preservation Stem In The Young And Middle-aged Patients With THA

Objective To evaluate the short-term clinical outcomes of total hip arthroplasty(THA) with Tri-Lock bone preservation stem(Tri-Lock BPS) in young and middle-aged patients. Methods 19 cases(19 hips) were treated with Tri-Lock BPS from March 2011 to August 2013. All operations were performed using a posterolateral approach. Femoral neck was resected at a 50-degree angle, and took out femoral head. The acetabular cup and Tri-Lock BPS was implanted after under-reaming the acetabulum and femur. The surgeon checked the position, tightness, activity and stability of the cup and Tri-Lock BPS before resetting. Results In this group, the length of incision was(9.3±1.5) cm and the amount of bleeding is(300.0±141.0) ml. The 19 cases were followed up for 3~31(19.5±8.0) months without infection, thrombosis, joint dislocation and heterotopic ossification. In the latest follow-up, all patients were relieved of pain without lameness and the hip joint activity was about 70°~110°. The preoperative average Harris score was(58.4±18.6) point and the postoperative average score was(97.3±3.9) point. There was statistically significant difference between each groups(P < 0.01). The preoperative average offset was(4.9±2.9)mm and the postoperative average offset was(2.0±1.7)mm. There was statistically significant difference between 2 groups(t=3.76, P < 0.01). Conclusion The short-term clinical outcomes of THA with Tri-Lock BPS in young and middle-aged patients is satisfactory. In addition to improving bone retention, Tri-Lock BPS can also be applied to the patients with lesions of distal femur or Dorr A femoral canal.