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Table 3 Comparisons between group A (re-operation) and group B (no re-operation)–preoperative MRI

From: Re-operation rate after surgical treatment of osteochondral lesions of the talus in paediatric and adolescent patients

  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
  1. Preoperative MRI was available in 21 cases at the time of retrospective analysis. MRI magnetic resonance imaging, ICRS International Cartilage Repair Society, MOCART magnetic resonance observation of cartilage repair tissue, SD standard deviation, b Chi square test; c t test