Abstract
Purpose
This study aimed to identify factors related to collapse progression in Japanese Investigation Committee classification type B osteonecrosis of the femoral head (ONFH) and to identify patients who would benefit from surgical treatment.
Methods
This study included 41 patients (56 hips) with type B ONFH with a minimum follow-up of three years. Based on a ≥ 3 mm collapse progression in ONFH, we categorised patients into two groups: collapse progression and no collapse progression. Sagittal and coronal computed tomography images were used to measure the necrotic region relative to the intact femoral head diameter. The ratios of the necrotic regions of transverse and vertical diameter in coronal and sagittal images are defined as mediolateral transverse and mediolateral vertical, anteroposterior transverse and anteroposterior vertical, respectively. Demographic data and these imaging findings were compared between the two groups. We established a cut-off value for predicting collapse progression through receiver operating characteristic analysis and determined survival rates.
Results
Type B ONFH had a 17.8% collapse progression rate. The mediolateral transverse, mediolateral vertical, anteroposterior transverse, and anteroposterior vertical were significantly higher in the collapse progression group (P < 0.01). Mediolateral transverse was an independent risk factor of collapse progression (hazard ratio, 1.27; 95% confidence interval, 1.03–1.57; P = 0.03), with an optimal cut-off of 45.6%. The 5-year survival rates with collapse progression as the endpoints were 57.0 and 94.9% in the mediolateral transverse of ≥ 45.6 and < 45.6%, respectively.
Conclusion
A mediolateral transverse of ≥ 45.6% predicts collapse progression in patients with type B ONFH.
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Data availability
The datasets during and/or analyzed during the current study available from the corresponding author on reasonable request.
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Acknowledgements
We thank the following people for their contributions: Takamune Asamoto, Shinya Tanaka and Keiji Otaka.
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Hiroaki Ido [1] substantial contributions to research design, or the acquisition, analysis or interpretation of data; [2] drafting the paper or revising it critically; [3] approval of the submitted and final versions.
Yusuke Osawa: [1] substantial contributions to research design, or the acquisition, analysis or interpretation of data; [2] drafting the paper or revising it critically; [3] approval of the submitted and final versions.
Yasuhiko Takegami: [2] drafting the paper or revising it critically; [3] approval of the submitted and final versions.
Hiroto Funahashi: [2] drafting the paper or revising it critically; [3] approval of the submitted and final versions.
Yuto Ozawa: [1] the acquisition of data; [2] approval of the submitted and final versions.
Shiro Imagama: [1] drafting the paper or revising it critically; [2] approval of the submitted and final versions.
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Ido, H., Osawa, Y., Takegami, Y. et al. Factors related to collapse progression in Japanese Investigation Committee classification type B osteonecrosis of the femoral head. International Orthopaedics (SICOT) (2024). https://doi.org/10.1007/s00264-024-06221-5
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DOI: https://doi.org/10.1007/s00264-024-06221-5