Table 3 Comparisons between group A (re-operation) and group B (no re-operation)–preoperative MRI
Group A n = 7 | Group B n = 20 | P value/test | |
|---|---|---|---|
Lesion size (Mean ± SD) Not applicable n = 2 | 1.06 ± 0.36 cm2 | 1.25 ± 0.51 cm2 | n.s.c |
Lesion depth (Mean ± SD) Not applicable n = 2 | 4.4 ± 1.1 mm | 5.1 ± 1.7 mm | n.s.c |
ICRS classification (n/%) | |||
0 | 0 | 2/12.5 | n.s.b |
1 | 1/20.0 | 4/25.0 | |
2 | 3/60.0 | 2/12.5 | |
3 | 1/20.0 | 4/25.0 | |
4 | 0 | 4/25.0 | |
Joint effusion (n/%) | |||
Yes | 4/80 | 13/81.3 | n.s.b |
No | 1/20 | 3/18.7 | |
Bone marrow oedema (n/%) | |||
Yes | 5/100.0 | 15/93.7 | n.s.b |
No | 0 | 1/6.3 | |
Change of bony contour (n/%) | |||
Yes | 2/40.0 | 11/68.7 | n.s.b |
No | 3/60.0 | 5/31.3 | |
Associated subchondral cyst (n/%) | |||
Yes | 1/20.0 | 3/18.8 | n.s.b |
No | 4/80.0 | 13/81.2 | |
Fluid surrounding loose body (n/%) | |||
No | 1/20.0 | 4/25.0 | n.s.b |
Incomplete | 4/80.0 | 11/68.7 | |
Complete | 0 | 1/6.3 | |
Dislocation of loose body (n/%) | |||
Yes | 0 | 1/6.3 | n.s.b |
No | 5/100.0 | 15/93.7 | |