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Table 1 Grading system for macroscopic lesions of cartilage

From: Effects of alendronate on cartilage lesions and micro-architecture deterioration of subchondral bone in patellofemoral osteoarthritic ovariectomized rats with patella-baja

Grade

Cartilage

0

Normal appearance

1

Slight yellowish discoloration of the chondral surface

2

Small cartilage erosions in load-bearing areas

3

Large erosions extending down to the subchondral bone

4

Large erosions with large areas of subchondral bone exposed

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Journal of Orthopaedic Surgery and Research

ISSN: 1749-799X