Halo Gravity Traction Is Associated with Reduced Bone Mineral Density of Patients with Severe Kyphoscoliosis

Table 3

Reduction rates of BMD among CS, NF1, and IS.

		NF1	CS	IS
LS		4	5	8
	Reduction rate (g/[cm^2month])	0.015 ± 0.010	0.034 ± 0.024	0.029 ± 0.015	0.274
FN		6	4	8
	Reduction rate (g/[cm^2month])	0.020 ± 0.007	0.015 ± 0.005	0.016 ± 0.011	0.610

“LS” denotes lumbar spine (L2–L4).
“FN” denotes femoral neck of the nondominant side.
“NF1” denotes neurofibromatosis type 1.
“CS” denotes congenital spinal deformity.
“IS” denotes idiopathic spinal deformity.
“”: number of patients with BMD reduction.