• World Neurosurg · Jun 2019

    Comparative Study

    Validity of a smartphone application (SagittalMeter Pro) for the measurement of sagittal balance parameters.

    • Jong Beom Lee, Il Sup Kim, Jung Jae Lee, Jong-Hyeok Park, Chul Bum Cho, Seung Ho Yang, Jae Hoon Sung, and Jae Taek Hong.
    • Department of Neurosurgery, St. Vincent`s Hospital, Catholic University of Korea, Suwon, South Korea.
    • World Neurosurg. 2019 Jun 1; 126: e8-e15.

    ObjectiveThe study was aimed to compare the validity, reproducibility, precision, and efficiency of a picture archiving and communication system (PACS) and a smartphone application, which is an educative app to easily measure sagittal balance parameters (SagittalMeter Pro), for measuring spinopelvic sagittal parameters.MethodsThree spine surgeons measured lumbar lordosis (LL), pelvic incidence (PI), sacral slope (SS), and pelvic tilt (PT) on standing posteroanterior radiographs of 30 patients using PACS and SagittalMeter Pro. Measurements were repeated a week after the original measurements. Intraobserver and interobserver variabilities and reliabilities of each parameter (LL, PI, SS, and PT) were calculated for both techniques. Comparisons were performed using the paired t-test. Results are expressed as mean ± standard deviation and P values of < 0.05 were considered significant.ResultsPACS to SagittalMeter Pro differences between the mean absolute values of LL, PI, SS, PT were 0.50°, 0.82°, 0.81°, 0.34°, respectively, and intraobserver and interobserver variabilities were similar. Excellent intraobserver and interobserver reliabilities were obtained for PACS and SagittalMeter Pro as demonstrated by values >0.86 and >0.84, respectively. Measurement times for PACS and SagittalMeter Pro were 36.63 ± 7.55 and 14.57 ± 1.96 seconds, respectively, and this difference was significant (P = 0.001).ConclusionsThe study shows PACS and SagittalMeter Pro are equivalent in terms of their abilities to measure spinopelvic sagittal parameters, and that the time required to obtain measurements was significantly less for SagittalMeter Pro. We believe that SagittalMeter Pro may be helpful when planning spinal surgery.Copyright © 2018. Published by Elsevier Inc.

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