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Table 1 Criteria for the inclusion of degenerative group

From: MRI-based vertebral bone quality score for the assessment of osteoporosis in patients undergoing surgery for lumbar degenerative diseases

Grade

Criteria

Grading osteoarthritis of the facet joints

0

Normal facet joint space (2 ± 4 mm width)

1

Narrowing of the facet joint space (< 2 mm) and/or small osteophytes and/or mild hypertrophy of the articular process

2

Narrowing of the facet joint space and/or moderate osteophytes and/or moderate hypertrophy of the articular process and/or mild subarticular bone erosions

3

Narrowing of the facet joint space and/or large osteophytes and/or severe hypertrophy of the articular process and/or severe subarticular bone erosions and/or subchondral cysts

Direction of the formation of anterior lumbar vertebral osteophytes

A

No osteophytes

B

The pair of osteophytes extended in the direction of the adjacent disc

C

Almost complete bone bridge formation by a pair of osteophytes across the intervertebral disc space

D

The pair of osteophytes extended in a direction away from the adjacent disc

E

The osteophytes extended nearly horizontally to the vertebral body border without closing the intervertebral disc space

F

Ungroupable