Table 4.

Osteoarthritis grading of available patients^a.

	n	%
Pre-operative grade of osteoarthritis
Normal cartilage	229	38.4
Minimal osteoarthritis	174	29.2
Osteoarthritis	193	32.4
Total	596	100
Post-operative grade osteoarthritis
Normal cartilage	100	25.5
Minimal osteoarthritis	156	39.8
Osteoarthritis	136	34.7
Total	392	100

^aAll patients eligible for grading were selected and regrouped based on the classification published by Claes et al. [20].