Table 1 Different factors previously reported as risk factors for developing heterotopic ossification (HO)

Traumatic brain injury

4 (25%)

3 (4%)

p = 0.014*

Spine injury

5 (31%)

15 (20.3%)

p = 0.337

Male–female ratio

10:6 (69%♂; 31%♀)

56:18 (76%♂; 24%♀)

p = 0.351

Interval injury to treatment (days mean ± SD)

9.188 ± 4.35

7.095 ± 4.33

p = 0.074; EE = −2

−4 to 0

Age (years mean ± SD)

39.875 ± 17.32

34.473 ± 13.30

p = 0.281; EE = −2

−13 to 4