Synovial fluid (SF) is articular joint lubrication. It contains a linear biopolymer called Hyaluronic acid(HA), which causes the viscoelastic behavior. Several studies on viscoelasticity of synovial fluid orHA solutions with different concentration and molecular weight have been carried out withrheometers. However, there are very few studies on the effect of viscoelasticity on HA solutionsmovement and velocity distribution inside the joint gap. Therefore, in this study, HA solutions withdifferent concentrations were studied under a sinusoidal reciprocating movement inside a rectangularmini-channel. This study focuses on deriving velocity distribution along channel width with MicroParticle Image Velocimetry (micro-PIV). Very high viscosity of the HA solutions suggests a quasisteadybehavior for this solution under investigated sinusoidal movement. However, the resultsindicated that the steady state laws are not applicable for estimating the HA behavior because ofspecial polymeric behavior of the HA chains inside the solutions.