Table 9: Number of Z joint articular surfaces with signs of degeneration per animal*

Table 9

Number of Z joint articular surfaces with signs of degeneration per animal * *

Weeks released Controls (SD) 1 week (SD) 4 week (SD) 8 week (SD)

0 N/A 5.0 (0.0) 6.7 (1.5) 8.0 (N/A)

1 0.3 (0.5) 2.7 (2.9) 7.3 (0.6) 7.7 (0.6)

2 1.5 (1.7) 2.3 (4.0) 7.7 (0.6) 7.8 (0.5)

4 1.3 (1.5) 6.3 (1.5) 6.3 (2.1) 8.0 (0.0)

8 2.7 (2.3) 4.3 (2.8) 8.0 (0.0) 8.0 (0.0)

12 1.8 (0.5) 6.7 (0.6) 6.0 (2.0) 6.7 (2.3)

16 4.3 (3.0) N/A N/A N/A

Average 1.9 (2.0) 4.5 (2.7) 7.1 (1.4) 7.7 (1.0)

Degeneration occurrence parameter-total possible = 8.0.

KW, Kruskal-Wallis statistic.

*A significant difference was found among groups (KW = 48.26, P < .0001).

Weeks released	Controls (SD)	1 week (SD)	4 week (SD)	8 week (SD)


0	N/A	5.0 (0.0)	6.7 (1.5)	8.0 (N/A)

1	0.3 (0.5)	2.7 (2.9)	7.3 (0.6)	7.7 (0.6)

2	1.5 (1.7)	2.3 (4.0)	7.7 (0.6)	7.8 (0.5)

4	1.3 (1.5)	6.3 (1.5)	6.3 (2.1)	8.0 (0.0)

8	2.7 (2.3)	4.3 (2.8)	8.0 (0.0)	8.0 (0.0)

12	1.8 (0.5)	6.7 (0.6)	6.0 (2.0)	6.7 (2.3)

16	4.3 (3.0)	N/A	N/A	N/A

Average	1.9 (2.0)	4.5 (2.7)	7.1 (1.4)	7.7 (1.0)