Differences in Baseline Joint Moments and Muscle Activation Patterns Associated With Knee Osteoarthritis Progression...

Area of Science:

• Orthopedics
• Biomechanics
• Biomedical Engineering

Background:

• Knee osteoarthritis (OA) progression involves structural and clinical changes, which may not occur concurrently.
• Understanding mechanical factors driving OA progression is crucial for effective conservative management.
• Gait analysis offers insights into biomechanical differences associated with OA progression.

Purpose of the Study:

• To investigate baseline gait differences between individuals with knee OA who progressed versus those who did not.
• To differentiate mechanical factors associated with structural (radiographic) versus clinical (total knee arthroplasty) progression outcomes.

Main Methods:

• Baseline gait data from 49 knee OA patients were analyzed.
• Progression was defined by radiographic medial joint space narrowing or total knee arthroplasty at 7-year follow-up.
• Principal component analysis extracted key knee moments and electromyography features.

Main Results:

• Radiographic progression was associated with greater mid-stance internal knee rotation moments.
• Total knee arthroplasty progression showed prolonged rectus femoris and lateral hamstrings muscle activation.
• Distinct gait patterns were observed for different knee OA progression outcomes.

Conclusions:

• Prolonged muscle activation may play a role in total knee arthroplasty progression.
• Radiographic knee OA progression might be related to increased loading magnitude.
• Mechanical factors influencing gait differ between structural and clinical knee OA progression.