Effects of the distance between the center of tantalum rod implantation and osteonecrosis region on femoral head necrosis surgery outcomes

ZHU Wen-ming; DI Teng-fei; YU Bao-zhan; ZHANG Hao

doi:10.3969/j.issn.2095-252X.2025.03.009

Abstract：Objective To explore the effect of the distance between the distal center point of tantalum rod implantation and the central area of bone necrosis on the surgical effect of patients with Ficat Ⅱ femoral head necrosis.Methods The clinical data of 90 patients with Ficat Ⅱ femoral head necrosis who underwent surgery in our hospital from September 2018 to December 2021 were retrospectively analyzed.According to the distance between the distal center point of tantalum rod implantation and the central area of bone necrosis,all patients were divided into 3-6 mm group(60 cases)and>6 mm group(30 cases).The hip joint recovery of the two groups was compared 12 months after surgery.The Harris hip score and VAS score(visual analogue scale,VAS)before surgery,6 months,12 months after surgery and at the last follow-up were evaluated and compared between the two groups.The incidence of postoperative complications and collapse rate of the two groups were recorded.Results The postoperative hip joint recovery rate of patients in the group with a distance of 3-6 mm was significantly higher than that in the>6 mm group(96.67%vs.80.00%,P<0.05);at 6 months,12 months after surgery and at the last follow-up,the VAS scores of patients in the 3-6 mm group were significantly lower than those in the>6 mm group(P<0.05),and the Harris score in the 3-6 mm group was higher at the last follow-up(86.12±6.77 vs.81.45±6.26,P<0.05);the incidence of postoperative complications and collapse in the 3-6 mm group was significantly lower than that in the>6 mm group,and the differences were statistically significant(P<0.05).Conclusions During tantalum rod implantation,the distance between the tip of the tantalum rod and the center of necrosis has a significant impact on the postoperative efficacy of early femoral head necrosis.Keeping the distance at 3-6 mm is more conducive to delaying the collapse of the femoral head after necrosis.