Table 1 Details of soccer players and baseball players with symptomatic spondylolysis

Number

33

49

Age (years)

15.4 ± 1.4

15.4 ± 1.6

n.s.

Interval from onset of low back pain to MRI (weeks)

3.5 ± 2.4

4.3 ± 4.1

n.s.

Number (%) of players with multiple HSL on STIR-MRI, n (%)

21 (63.6%)

10 (20.4%)

< 0.001

Number (%) of players with HSL at multiple lumbar levels on STIR-MRI, n (%)

7 (21.2%)

2 (4.1%)

0.03

Number (%) of players with bilateral HSL on STIR-MRI, n (%)

20 (60.6%)

9 (18.4%)

< 0.001