Halo gravity traction for pediatric scoliosis and kyphoscoliosis: A review of current evidence and best practices

Table 1 Change in pulmonary function test (forced vital capacity and forced expiratory volume in 1 second) before and after halo gravity traction, and at final follow-up

Ref.	Year	Sample size	Mean follow-up	Pre-traction FVC/FEV1	Post traction FVC/FEV1	FVC/FEV1 at final follow-up
Grabala et al[38]	2024	20	3.8 years	54.5%/60.8%	66.7%/70.1%	74.9%/75.9%
LaMont et al[19]	2019	107	2 years	38%/37.7%	43.9%/42.1%	43.5%/43.2%
Koller et al[6]	2012	45	33 months	FVC%-49.5%	FVC%-49.5%	FVC%-45%
Wang et al[28]	2024	33	NA	43.5%/41.9%	47.3%/45.2%	NR
Iyer et al[9]	2019	30	16 months	75.43%/64.35%	68.11%/ 60.83%	NR
Garabekyan et al[16]	2014	21	2.4 years	FVC-1.31 L, FEV1-1.01 L	FVC-1.61 L, FEV1-1.3 L	NR
Bogunovic et al[11]	2013	33	NA	45.4%/43.7%	53.1%/52.7%	NR

FVC: Forced vital capacity; FEV1: Forced expiratory volume in 1 second; NA: Not available; NR: Not report.