To observe the effects of Tri-Lock bone preservation stem (BPS) and Corail femoral stem prosthesis on perioperative indicators, joint function scores and postoperative complications in patients undergoing total hip arthroplasty (THA).

A total of 243 patients with developmental dysplasia of the hip who underwent primary THA in the First People’s Hospital of Guangyuan were enrolled, while the patients with hip surgical history, American Society of Anesthesiologists (ASA) classification ≥Ⅲ, bone density T value <-5 and other severe diseases were excluded. The patients were assigned to the Corail group (123 cases, 167 hips) and the Tri-Lock BPS group (120 cases, 151 hips) according to different femoral stem prostheses used. T test and chi-squared test were performed to compare perioperative indicators, joint function, initial stability of femoral stem, imaging parameters, gait parameter and postoperative complications between the two groups.

Blood loss of the Tri-Lock BPS group was less than that of the Corail group, and length of postoperative hospital stay was significantly shorter than that of the Corail group (t=3.148, P<0.05). Harris scores of the two groups at one, three, six and twelve months after surgery showed statistically significant differences in terms of time effect (F=1295.358, P<0.05). The femur offset, bone mass retention area of the widest part of the lesser trochanter and bone mass retention volume between the greater and lesser trochanters in the Tri-Lock BPS group were larger than those in the Corail group (t=9.701, 4.941, 46.493, all P<0.05). The stride length and step length of Tri-lock BPS group were significantly larger than that of Corail group (t=4.113, 5.083, both P<0.05). The stride frequency and gait asymmetry index were significantly smaller than that of Corail group (t=3.458, 4.911, both P<0.05). The postoperative complication rate in the Tri-Lock BPS group was lower than that in the Corail group (χ²=4.074, P<0.05).

Applying Tri-Lock BPS femoral stem in THA can reduce blood loss, shorten the length of hospital stay, increase offset value, retain more bone mass in the broadest part of the lesser trochanter and the intertrochanteric bone mass, improve gait, and reduce postoperative complication risk.