A. No osteoarthritis: No subcortical sclerosis or articular surface flattening; and no deformation due to subcortical cyst, surface erosion, osteophyte, or generalized sclerosis.
B. Indeterminate for osteoarthritis: Subcortical sclerosis with/without articular surface flattening; or articular surface flattening with/without subcortical sclerosis; and no deformation due to subcortical cyst, surface erosion, osteophyte, or generalized sclerosis.
C. Osteoarthritis: Deformation due to subcortical cyst, surface erosion, osteophyte, or generalized sclerosis.