Skeletal Tissue Mechanics by R. Bruce Martin David B. Burr Neil A. Sharkey & David P. Fyhrie

Author:R. Bruce Martin, David B. Burr, Neil A. Sharkey & David P. Fyhrie
Language: eng
Format: epub
Publisher: Springer New York, New York, NY

5.3.3 Types of Lubrication

There are several different mechanisms by which lubrication can be achieved. Each of the following mechanisms is thought to play a role in the lubrication of synovial joints.

5.3.3.1 Boundary Lubrication

“All things and everything whatsoever however thin it be which is interposed in the middle between objects that rub together lighten the difficulty of this friction.”

So said Leonardo da Vinci, and while this translation may not win a prize for punctuation, it is perhaps as good a description as any of the idea behind boundary lubrication. Placing a “boundary” layer (i.e., an extremely thin layer, perhaps one molecule thick) of almost any liquid-like material between the bearing surfaces holds the surface projections slightly apart, reduces adhesion, and keeps the projections from interlocking (Fig. 5.15).

Figure 5.15Polymer lubricants (red and blue) between cartilage surfaces (black lines) greatly reduce friction by trapping a water film (water molecules not drawn).

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