Three-dimensional analysis of normal ankle and foot mobility

Area of Science:

• Biomechanics
• Orthopedics
• Human Anatomy

Background:

• Accurate assessment of foot and ankle joint mobility is essential for clinical practice.
• Previous studies have not fully elucidated the rotational contributions of individual joints during various foot positions.

Purpose of the Study:

• To precisely define and quantify the rotational motion of key foot and ankle joints.
• To establish a baseline understanding of normal foot and ankle kinematics under extreme positional conditions.

Main Methods:

• Utilized thirteen fresh-frozen human foot specimens.
• Employed a magnetic tracking device to simultaneously monitor bone positions.
• Measured joint rotation in pronation, supination, dorsiflexion, and plantar flexion relative to a neutral position.

Main Results:

• Pronation: Maximum rotation at the metatarsal-navicular joint.
• Supination: Maximum rotation at the navicular-talar joint.
• Dorsiflexion & Plantar Flexion: Maximum rotation at the talar-tibial joint, with significant motion also observed at other levels.

Conclusions:

• Specific joints exhibit distinct rotational patterns during different foot and ankle movements.
• This detailed kinematic data is vital for clinical applications including diagnosis, treatment planning, and rehabilitation monitoring.