Anatomical and radiological study applied to distal radius surgery.

Area of Science:

• Orthopedic surgery
• Anatomy
• Biomechanical engineering

Background:

• Distal radius fractures are common, requiring precise surgical intervention.
• Current anterior plating techniques and wrist arthroplasty implants have limitations due to distal radius anatomy.

Purpose of the Study:

• To define screw length limits for anterior plating to prevent extensor tendon damage.
• To determine the optimal anterior plate shape for distal radius fixation.
• To ascertain the distal radius axis projection for improved wrist arthroplasty.

Main Methods:

• Computed tomography (CT) scans of 74 dry adult radii.
• Measurement of radial thickness at key anatomical landmarks.
• Calculation of metaphyseal-epiphyseal angles and distal radius axis projection.

Main Results:

• Significant differences in lateral (155°) and intermediate (145°) column slopes were found.
• The distal radius axis projects onto the posterior-lateral quadrant of the articular surface.
• Mean thickness at the dorsal tubercle was 22.1 mm.

Conclusions:

• The dual slope of the distal radius necessitates an "anatomical" plate shape between the two measured slopes.
• Understanding the radial axis projection is crucial for simplifying wrist replacement surgery.
• Precise anatomical evaluation is vital for new distal radius implants.