Table 3.

Radiographic and Patient Data (GS Conversion to Fused at Follow-Up)

Parameter		Index surgical procedure				p
		Definitive fusion		Growth sparing
		N	Mean (range)	N	Mean (range)
Preoperative	Major curve cobb	21	73 (47–105)	18	77 (47–131)	0.6
	T1-12 height (mm)	21	166 (126–215)	18	164 (114–201)	0.8
	T1-S1 length (mm)	21	292 (221–354)	18	279 (205–341)	0.3
	Max kyphosis	20	48 (5–81)	18	43 (15–75)	0.4
	Age at surgery (years)	21	9.1 (6.1–10.9)	18	7.9 (6.3–10)	0.003
	Curve levels	21	12 (5–15)	18	13.4 (10–17)	0.2
Radiographic follow-up	Age (years)	21	14.5 (11.1–17.8)	18	14.3 (11–19.6)	0.8
	Time since surgery (months)	21	63 (26–101)	18	76 (40–138)	0.2
	Major curve cobb	21	32 (4–76)	18	32 (13–60)	0.9
	T1-12 height (mm)	21	199 (156–241)	18	211 (156–262)	0.2
	T1-S1 length (mm)	21	340 (271–446)	18	354 (289–428)	0.3
	Max kyphosis	21	37 (9–55)	18	36 (7–58)	1.0
	Instrumented levels	21	12.8 (5–18)	18	14.2 (11–16)	0.1
	Additional surgeries	21	0.6 (0–4)	18	3.3 (1–11)	< 0.001
PFT follow-up	Age (years)	21	13.6 (10.7–17.8)	18	12.6 (9.5–15.8)	0.1
	Time since surgery (months)	21	53 (26.7–84.9)	18	56 (30–106)	0.7
	FVC actual	21	1.9 (0.5–6)	18	1.7 (0.3–3.4)	0.4
	FVC percent predicted	21	58 (15–158)	18	50 (14–74)	0.3
	FEV1 actual	21	1.4 (0.5–2.3)	18	1.4 (0.3–2.3)	0.6
	FEV1 percent predicted	21	51 (16–77)	18	48 (14–70)	0.5
Changes at follow-up	% Correction major curve cobb		54 (− 29 to 94)		55 (-13–82)	0.9
	Change in T1-12 height (mm)		33 (− 6 to 76)		47 (18–100)	0.1
	Change in T1-S1 length (mm)		48 (11–118)		74 (43–125)	0.002
	Change in levels		1 (0–7)		1 (− 2 to 7)	0.9
	ΔFVC actual		0.7 (0.1–1.7)		0.7 (0.6–0.9)	0.7
	ΔFVC % predicted		− 3.9 (− 63–54)		− 7.8 (− 32 to 11)	0.7
	ΔFEV1 actual		0.5 (0.1–1.2)		0.5 (0.3–0.7)	1.0
	ΔFEV1% predicted		− 2.6 (− 24–39)		− 12.1 (− 40 to 4)	0.2