Validation of Veterans RAND 12-Item Physical Function Survey in Minimally Invasive Transforaminal Lumbar Interbody Fusion

Michael T. Nolte; James M. Parrish; Nathaniel W. Jenkins; Elliot D.K. Cha; Conor P. Lynch; Caroline N. Jadczak; Shruthi Mohan; Cara E. Geoghegan; Nadia M. Hrynewycz; Kern Singh

doi:10.14444/8308

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Figure 1
Correlation of Veterans RAND 12-item physical component score (VR-12 PCS) with patient-reported outcomes measurement information system physical function (PROMIS-PF) and 12-item Short Form physical component score (SF-12 PCS) at the preoperative timepoint.
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Figure 2
Correlation of Veterans RAND 12-item physical component score (VR-12 PCS) with patient-reported outcomes measurement information system physical function (PROMIS-PF) and 12-item Short Form physical component score (SF-12 PCS) at the 6-wk postoperative timepoint.
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Figure 3
Correlation of Veterans RAND 12-item physical component score (VR-12 PCS) with patient-reported outcomes measurement information system physical function (PROMIS-PF) and 12-item Short Form physical component score (SF-12 PCS) at the 12-wk postoperative timepoint.
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Figure 4
Correlation of Veterans RAND 12-item physical component score (VR-12 PCS) with patient-reported outcomes measurement information system physical function (PROMIS-PF) and 12-item Short Form physical component score (SF-12 PCS) at the 6-mo postoperative timepoint.
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Figure 5
Correlation of Veterans RAND 12-item physical component score (VR-12 PCS) with patient-reported outcomes measurement information system physical function (PROMIS-PF) and 12-item Short Form physical component score (SF-12 PCS) at the 1-y postoperative timepoint.

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Table 1

Baseline characteristics of study population.

Characteristics	Total %, (n)
Age, y, mean ± SD	53.8 ± 9.7
Gender, % (n)
Female	44.1% (26)
Male	55.9% (33)
Smoking status, % (n)
Nonsmoker	91.5% (54)
Smoker	8.5% (5)
Body mass index, % (n)
<30 kg/m²—nonobese	47.5% (28)
≥30 kg/m²—obese	52.5% (31)
Charlson Comorbidity Index, mean ± SD	1.8 ± 1.4
Spinal pathology, % (n)
Degenerative spondylolisthesis	63.3% (31)
Isthmic spondylolisthesis	20.4% (10)
Retrolisthesis	3.4% (2)
Lateral listhesis	1.7% (1)
Herniated nucleus pulposus	15.3% (9)
Degenerative disc disease	45.8% (27)
Stenosis	88.1% (52)
Foraminal stenosis	50.9% (30)
Perioperative characteristics, mean ± SD
Operative time, min)	121.1 ± 20.4
Estimated blood loss, mL)	56.2 ± 61.8
Hospital length of stay, h)	34.8 ± 17.5

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Table 2

Postoperative changes in physical function scores.

Patient-Reported Outcome Measure	n	Score,Mean ± SD	Change,Mean ± SD	P Value^a
Patient-Reported Outcome Measure	n	Score,Mean ± SD	Change,Mean ± SD	P Value^a	12-Item Veterans RAND PCS
Preoperative	59	32.3 ± 9.1
6 wk	59	33.8 ± 9.8	1.6 ± 9.5	0.210
12 wk	59	37.7 ± 11.2	5.5 ± 8.5	<0.001
6 mo	59	41.3 ± 12.2	9.1 ± 10.6	<0.001
1 y	59	42.2 ± 12.8	9.9 ± 11.1	<0.001
12-Item Short Form PCS
Preoperative	59	30.9 ± 8.0
6 wk	59	31.5 ± 8.8	0.6 ± 8.9	0.594
12 wk	58	35.6 ± 10.4	4.8 ± 8.7	<0.001
6 mo	59	38.5 ± 12.3	7.6 ± 10.6	<0.001
1 y	59	39.9 ± 12.5	9.1 ± 11.1	<0.001
PROMIS-PF
Preoperative	59	34.5 ± 6.1
6 wk	54	35.9 ± 7.2	1.6 ± 7.2	0.115
12 wk	53	40.7 ± 7.5	5.9 ± 7.3	<0.001
6 mo	52	43.3 ± 8.1	8.9 ± 8.5	<0.001
1 y	50	44.7 ± 10.1	9.5 ± 8.6	<0.001

Note: Boldface indicates statistical significance.
aP value calculated using paired t test comparing scores at each timepoint to preoperative values.
PCS, physical component score; PROMIS-PF, patient-reported outcomes measurement information system physical function.

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Table 3

Association of VR-12 with SF-12 and PROMIS-PF following minimally invasive surgery transforaminal lumbar interbody fusion.

Patient-Reported Outcome Measure	Pearson, r	P Value^a	Partial, r	P Value^a
VR-12 vs SF-12
Preoperative	0.917	<0.001	0.913	<0.001
6 wk	0.964	<0.001	0.963	<0.001
12 wk	0.973	<0.001	0.973	<0.001
6 mo	0.965	<0.001	0.960	<0.001
1 y	0.973	<0.001	0.972	<0.001
VR-12 vs PROMIS-PF
Preoperative	0.583	<0.001	0.572	<0.001
6 wk	0.727	<0.001	0.710	<0.001
12 wk	0.793	<0.001	0.792	<0.001
6 mo	0.832	<0.001	0.823	<0.001
1 y	0.845	<0.001	0.844	<0.001

Note: Boldface indicates statistical significance.
aP value signifes significant correlation.
PROMIS-PF, patient-reported outcomes measurement information system physical function; SF-12, Short Form 12-Item Survey; VR-12, Veterans RAND 12-Item Health Survey.