Unilateral Single Joint Arthritis Changes Joint Power in Unaffected Joints.

Area of Science:

• Biomechanics
• Orthopedics
• Musculoskeletal Health

Background:

• Arthritis commonly affects lower limb joints, leading to pain and disability.
• Limited data exists on how arthritis impacts joint power and compensatory mechanisms in affected and unaffected limbs.

Purpose of the Study:

• To investigate the effects of unilateral lower limb joint arthritis on joint and limb power.
• To determine if arthritis leads to power loss in the affected joint and limb.
• To assess compensatory power production in the contralateral limb and ipsilateral joints.

Main Methods:

• Collected ground reaction forces and joint angles during walking in participants with unilateral ankle, hip, or knee arthritis.
• Calculated bilateral joint power (hip, knee, ankle) and total limb power during the stance phase.
• Compared power output between affected and contralateral limbs, and across different joints.

Main Results:

• Arthritis in the hip, knee, or ankle significantly reduced power in the affected joint and limb.
• The contralateral limb, particularly the ankle, demonstrated increased power production to compensate.
• The ipsilateral knee showed some compensatory power increase in hip and ankle arthritis cases.

Conclusions:

• Isolated lower limb arthritis results in decreased power on the affected side.
• The contralateral limb compensates for power loss, increasing the risk of repetitive loading and further degeneration.
• Intervention is crucial to mitigate compensatory joint strain and prevent progressive joint damage.