Figure 3From: The pendulum test as a tool to evaluate passive knee stiffness and viscosity of patients with rheumatoid arthritisMean values and standard errors of stiffness (A) and viscosity (B) computed for RA patients (thick line) and control group (fine line) during the first six half-cycles. KF = stiffness in flexion; KE = stiffness in extension; BF = viscosity in flexion; BE = viscosity in extension.Back to article page