Kinematics of the foot

Area of Science:

• Biomechanics
• Orthopedics
• Medical Imaging

Background:

• Orthogonal stereoradiography is key for 3D human body segment analysis.
• Accurate measurement of foot ligament length and elongation is crucial for understanding foot biomechanics.

Purpose of the Study:

• To estimate the length and elongation of normal foot ligaments using orthogonal stereoradiographs.
• To analyze ligament behavior during simple and complex foot movements.

Main Methods:

• Utilized orthogonal stereoradiographs with metallic markers on tibia, fibula, tarsus, and metatarsals.
• Dissected an amputated lower limb to precisely locate ligament insertions.
• Digitized radiographs and employed a computer program to calculate ligament length and elongation.

Main Results:

• Calculated ligament length and elongation for normal dorsiflexion (20 degrees at talocrural joint).
• Assessed ligament behavior during complex rotational movements simulating abnormal high arches (e.g., Friedreich's ataxia).

Conclusions:

• Orthogonal stereoradiography provides a viable method for quantifying foot ligament dynamics.
• This technique can help elucidate biomechanical changes in conditions affecting foot structure and function.