Joint surface biolubrication

Joint surface biolubrication encompasses the biological mechanisms and macromolecules that reduce friction and wear between opposing cartilage surfaces in synovial joints. This system relies on the exudation and dynamic maintenance of a lubricating film composed primarily of hyaluronic acid and lubricin, which create both fluid film and boundary layers that separate and protect cartilage during joint movement and under varying mechanical loads[1][2][3][4][5]. Multiple lubrication regimes have been identified—including fluid film, boundary, squeeze film, elastohydrodynamic, boosted, and mixed lubrication—each activated depending on load, speed, and the material properties of the cartilage. Rather than a single target, joint surface biolubrication is a functional property arising from synergistic interactions among matrix molecules, the extracellular environment, and joint biomechanics[1][2][3][4][5]. Dysfunction of these mechanisms contributes directly to disease progression in osteoarthritis and other joint disorders.

Other names

Joint lubricationArticular cartilage lubricationSynovial joint biolubrication

Supplementation of hyaluronic acid to restore fluid film lubrication; Restoration of boundary lubrication by recombinant lubricin