Gait patterns in subjects with rheumatoid arthritis cannot be explained by reduced speed alone

Area of Science:

• Biomechanics
• Rheumatology
• Clinical Gait Analysis

Background:

• Rheumatoid arthritis (RA) is a chronic inflammatory disease affecting joints.
• Gait abnormalities are common in individuals with RA, impacting mobility and quality of life.
• Understanding specific gait characteristics in RA is crucial for targeted interventions.

Purpose of the Study:

• To investigate and compare gait parameters between individuals with rheumatoid arthritis (RA) and healthy controls.
• To analyze speed-dependent gait variables and their alterations in the RA group.
• To determine the effect of controlling for walking speed on gait characteristics in RA.

Main Methods:

• Seventeen RA patients (functional class II) and 20 healthy controls participated.
• Participants walked at five self-selected speeds on a straight walkway.
• Gait parameters were analyzed using an interpolation procedure to normalize for speed (0.8 m/s).

Main Results:

• At self-selected speeds, RA subjects walked slower with shorter step length and longer stance phase.
• When normalized for speed, RA subjects exhibited significantly shorter step length and higher cadence compared to controls.
• No significant differences in stance phase or step width were observed between groups after controlling for speed.

Conclusions:

• Gait characteristics in individuals with RA are significantly affected by walking speed.
• Controlling for speed reveals distinct gait patterns in RA, including shorter step length and higher cadence.
• Future gait studies involving RA patients should prioritize controlling for walking speed to ensure accurate analysis.