What is not a function of synovial fluid

Maintenance of ionic balance.

Explanation:

Synovial fluid is a viscous fluid found in the cavity of synovial joints. In terms of appearance the synovial fluid appears clear, Colorless (pale yellow), viscous, microbes free.

Synovial fluid has following functions in our body

a) shock absorption

b) nutrient distribution

c) lubrication of the articular surfaces

d) waste disposal