Table 2 Comparison of MRI cartilage thickness measurements at subdivision of tibial condyle in AS patients and controls

(a) Medial compartment

R ant (mm)

1.34 ± 0.43 (0.60–2.00)

3.21 ± 0.59 (2.50–4.10)

0.0001*

R middle (mm)

1.61 ± 0.54 (0.70–3.10)

3.06 ± 0.56 (2.20–3.90)

0.0001*

R post (mm)

1.50 ± 0.37 (1.0–2.10)

3.65 ± 0.82 (1.60–4.10)

0.0001*

L ant (mm)

1.25 ± 0.40 (0.60–2.00)

2.79 ± 0.49 (2.30–4.0)

0.0001*

L middle (mm)

1.59 ± 0.50 (0.70–3.10)

2.86 ± 0.36 (2.00–3.70)

0.0001*

L post (mm)

1.45 ± 0.32 (1.0–2.10)

1.45 ± 0.32 (1.0–2.10)

0.0001*

(b) Lateral compartment

R ant (mm)

1.35 ± 0.37 (0.70–2.20)

3.19 ± 0.48 (2.70–4.0)

0.0001*

R middle (mm)

2.02 ± 0.77 (1.0–3.70)

3.01 ± 0.51 (1.90–3.70)

0.0007*

R post (mm)

1.96 ± 0.73 (0.90–3.50)

3.32 ± 0.47 (2.50–4.10)

0.0001*

L ant (mm)

1.29 ± 0.31 (0.70–2.20)

2.91 ± 0.41 (2.40–3.90)

0.0001*

L middle (mm)

1.91 ± 0.72 (1.0–3.70)

2.95 ± 0.41 (1.70–3.60)

0.0002*

L post (mm)

1.86 ± 0.70 (0.90–3.50)

2.87 ± 0.40 (2.30–4.0)

0.0002*