A novel method for estimating nail-tract bone density for intertrochanteric fractures.

Area of Science:

• Orthopedic surgery
• Biomedical imaging
• Bone density quantification

Background:

• Unstable intertrochanteric fractures can lead to cut-out complications due to poor bone quality.
• Bone mineral density (BMD) is a key indicator of bone quality.
• A novel method was developed to quantify volumetric bone mineral density (vBMD) in the femoral head nail tract.

Purpose of the Study:

• To propose and validate a novel voxel-based morphometry (VBM) method for quantifying average vBMD in the femoral head nail tract.
• To compare the average vBMD of nail tracts between patients treated with proximal femoral nail antirotation (PFNA) and gamma nail (GN).

Main Methods:

• A standard nail tract was created in a proximal femur template.
• Patient proximal femur structures were mapped to the template using B-spline and Demons registration.
• Average vBMD of the nail tract was calculated and visualized; reproducibility was assessed using CV-RMSSD; Mann-Whitney U test compared PFNA and GN groups.

Main Results:

• The developed VBM method demonstrated good reproducibility for intraoperator (CV-RMSSD: 1.0%-2.0%) and interscan (CV-RMSSD: 3.6%-4.5%) measurements.
• No significant difference in average vBMD was found between the PFNA and GN groups (p > 0.05).

Conclusions:

• The proposed VBM method is reproducible and can provide a valuable reference index for selecting intramedullary nails.
• This quantitative approach may help overcome surgeon bias in implant selection.
• The method has potential to guide personalized implant choices for improved patient outcomes.