Does T'ai Chi Gait Reduce External Knee Adduction Moment?

Area of Science:

• Biomechanics
• Exercise Science
• Orthopedics

Background:

• T'ai chi chuan is recognized for its health benefits, but its biomechanical underpinnings, particularly concerning joint loading, remain underexplored.
• Understanding the mechanical forces during T'ai chi chuan practice is crucial for its therapeutic application.

Purpose of the Study:

• To quantify the external knee adduction moment (EKAM) during t'ai chi gait (TCG) and compare it with normal walking (NW).
• To assess TCG as a potential intervention for reducing medial knee compartment loading.

Main Methods:

• Employed a quantitative biomechanics approach to measure peak EKAM.
• Compared EKAM patterns between TCG and NW across different gait phases.

Main Results:

• TCG exhibited a tri-modal EKAM pattern, distinct from the bimodal pattern observed in NW.
• Peak EKAM was reduced by 25%-47% during the double-limb support phases of TCG compared to NW.
• The single-limb support phase in TCG demonstrated a significantly higher peak EKAM than its double-limb support phases.

Conclusions:

• T'ai chi chuan practice, particularly TCG, may offer a beneficial strategy for mitigating medial knee joint mechanical load.
• The reduction in EKAM during double-limb support phases suggests therapeutic potential for knee osteoarthritis.
• Practitioners should be mindful of the elevated EKAM during the single-limb support phase of TCG.