The Kellgren and Lawrence grading system
| Grade | Description | |
|---|---|---|
| Hips classified as grade 2 or more were defined as having osteoarthritis. | ||
| 0 | No osteoarthritis | |
| 1 | Doubtful | Possible narrowing of joint space medially and possible osteophytes around the 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 the 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 |