Posted as supplied by author

Appendix: Kellgren & Lawrence score

grade		description
0	No osteoarthritis
1	Doubtful	Possible narrowing of joint space medially and possible osteophytes around femoral head; or osteophytes alone
2	Mild	Definite narrowing of joint space inferiorly, definite osteophytes and slight sclerosis
3	Moderate	Marked narrowing of joint space, definite osteophytes, some sclerosis and cyst formation and deformity of femoral head and acetabulum
4	Severe	Gross loss of joint space with sclerosis and cysts, marked deformity of femoral head and acetabulum and large osteophytes