To investigate the effect of neck-shaft Angle in Surgical Hip Dislocation Combined with Femoral Neck Rotational Osteotomy in the treatment of osteonecrosis of the femoral head and to combine with finite element analysis

Sun, Jiahao; MA, Bowen; CHEN, Zhiyuan; Xia, Tianwei; SHEN, Jirong

doi:10.3389/fbioe.2025.1495292

ORIGINAL RESEARCH article

Front. Bioeng. Biotechnol.

Sec. Biomechanics

Volume 13 - 2025 | doi: 10.3389/fbioe.2025.1495292

This article is part of the Research Topic Biomechanics in Orthopaedic Diseases and Surgery, Volume II View all 9 articles

To investigate the effect of neck-shaft Angle in Surgical Hip Dislocation Combined with Femoral Neck Rotational Osteotomy in the treatment of osteonecrosis of the femoral head and to combine with finite element analysis

Provisionally accepted

Jiahao Sun ^*

Bowen MA

Zhiyuan CHEN

Tianwei Xia

Jirong SHEN

Affiliated Hospital of Nanjing University of Chinese Medicine, Nanjing, China

The final, formatted version of the article will be published soon.

The Neck-shaft Angle (NSA) is a reliable predictor of the outcome of internal fixation for femoral neck fractures. Surgical Hip Dislocation Combined with Femoral Neck Rotational Osteotomy (SHD-FNRO) is an effective surgical method for treating femoral head necrosis. However, the potential role of NSA in predicting the outcomes of hip preservation after SHD-FNRO has not been explored.Objective: This study aims to investigate the value of NSA in predicting the outcomes of hip preservation after SHD-FNRO by comparing the results among different patients with osteonecrosis of the femoral head (ONFH) who were treated with SHD-FNRO.We retrospectively analyzed clinical data from 33 patients (33 hips) who underwent SHD-FNRO at our hospital between January 2017 and December 2021. Based on the outcome of hip preservation, patients were divided into two groups: group A (successful hip preservation) and group B (failed hip preservation). Statistical analysis was performed to evaluate any differences between these groups. Additionally, three-dimensional models with varying NSA values were created to analyze changes in maximum displacement and stress on the osteotomy surface.Results: During a mean follow-up period of approximately 40 months, successful hip preservation was achieved in 26 patients while 7 patients experienced failure. There was a statistically significant difference in NSA between these two groups (P < 0.05). Biomechanical analysis demonstrated a close relationship between NSA and postoperative biomechanical changes.

Keywords: Osteonecrosis of the femoral head, Surgical hip dislocation, Femoral Neck Rotational Osteotomy, Neck-shaft angle, Efficacy of hip preservation

Received: 12 Sep 2024; Accepted: 03 Mar 2025.

Copyright: © 2025 Sun, MA, CHEN, Xia and SHEN. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

* Correspondence: Jiahao Sun, Affiliated Hospital of Nanjing University of Chinese Medicine, Nanjing, China

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