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. 2020 Oct 8;21:664. doi: 10.1186/s12891-020-03664-w

Table 2.

Demographic and perioperative characteristics

Variables AHO Group Non-AHO Group P Value
No. of patients (n) 17 80
Age (years) 48.7 ± 7.2 48.5 ± 6.8 0.927
Gender (M/F) 5 / 12 29 / 51 0.781
BMI (kg/m2) 24.9 ± 2.8 24.2 ± 3.0 0.398
BMD T value (spine) 0.2 ± 1.3 0.5 ± 1.2 0.352
Serological indicator
 Pre-ALP 71.6 ± 26.0 66.4 ± 18.5 0.331
 Post-ALP 62.1 ± 21.3 59.2 ± 15.8 0.521
Arthroplasty segment 0.736
 C3/4 0 2
 C4/5 8 36
 C5/6 3 21
 C6/7 6 21
Fusion location 0.591
 Up 8 31
 Down 9 49
Operation time (minutes) 150.0 ± 26.8 134.6 ± 24.4 0.324
Blood loss (ml) 69.4 ± 48.1 66.1 ± 48.0 0.799
Follow-up time (months) 37.0 ± 17.3 37.7 ± 13.7 0.851

AHO anterior heterotopic ossification, BMI body mass index, BMD bone mineral density, Pre-ALP preoperative alkaline phosphatase, Post-ALP Immediate postoperative alkaline phosphatase

* P < 0.05