PTH and spinal cord injury: The deficiency of neurological function after spinal cord injury (SCI) is related to the level of parathyroid hormone (PTH) (Mechanick et al., 1997), Studies have found that PTH significantly decreases within 1–2 weeks after SCI (Vaziri et al., 1994; Rouleau et al., 2007), According to a study by del Rivero and Bethea (2016) the average plasma PTH level in the control group of mice was 30.65 pg/mg, while the average plasma PTH level in SCI mice was 20.5 pg/mg at 1week post-injury and 14.25 pg/mg at 4 weeks post-injury, indicating a gradual decline in parathyroid hormone.