Ankle morphometry evaluated using a new semi-automated technique based on X-ray pictures

Area of Science:

• Orthopedic surgery
• Anatomy
• Biomechanics

Background:

• Bone morphometry is crucial for joint arthroplasty design, impacting function and component sizing.
• Accurate human ankle joint geometry data is notably limited.
• Understanding ankle bone morphology aids in anatomical and biomechanical analyses.

Purpose of the Study:

• To quantify human ankle joint bone morphometry.
• To establish relationships between different ankle bone measurements.
• To assess the suitability of current total ankle replacement designs.

Main Methods:

• Collected morphological measurements from 36 subjects using a novel semi-automated radiographic technique.
• Utilized standard frontal and sagittal X-ray projections.
• Calculated lengths, heights, widths, and radii of curvature for key ankle joint components.

Main Results:

• Observed a wide range of values for ankle bone morphometric measures.
• Identified significant correlations among several internal measurements.
• Found no correlation between internal dimensions and subject height or malleolar width.

Conclusions:

• Ankle bones exhibit consistent proportional shapes across individuals.
• Internal ankle bone dimensions are not predictable from external measurements like malleolar width.
• Existing total ankle replacement designs may not accurately reflect native ankle joint dimensions.