Table 1.

Tribological system analysis of the experimental setup (according to GfT, Gesellschaft für Tribologie Arbeitsblatt 7/2002 (http://www.gft-ev.de) [27]) (NaCl: Natriumchloride solution; FCS: fetal calf serum; HA: hyaluronic acid)

	Native condition	Cartilage damage condition	Relubricated condition
Strain collective
Form of movement	Sliding	Sliding	Sliding
Sequence of movement	Oscillating	Oscillating	Oscillating
Force	100 – 400 N	100 – 400 N	100 – 400 N
Velocity	5°/s rotation	5°/s rotation	5°/s rotation
Temperature	22 °C	22 °C	22 °C
Exposure time	40 s	40 s	40 s
Structure of the Tribosystem
Body and Counterbody	Cartilage disc (5% cells, 95% matrix containing macromolecules and 80% water)	Cartilage disc (5% cells, 95% matrix containing macromolecules and 80% water)	Cartilage disc (5% cells, 95% matrix containing macromolecules and 80% water)
Intermediate medium	Synovial fluid		NaCl vs. FCS vs. HA
Surrounding medium	Air	Air	Air
Wear analysis
Friction condition	Hydrodynamic and mixed mode friction	Boundary mode friction	Hydrodynamic and mixed mode friction
Type of wear	Abrasion	Abrasion	Abrasion