Reliability and accuracy of digital software in measuring osseous markers related to stiff clubfoot

doi:10.12307/2022.171

Abstract

Abstract: BACKGROUND: Stiff clubfoot is a complex three-dimensional abnormal structural deformity. It is difficult to accurately evaluate the deformity degree of stiff clubfoot by two-dimensional plain film and physical examination.
OBJECTIVE: To explore the reliability and accuracy of 3-Matic software in measuring the related indexes of stiff clubfoot.
METHODS: Totally 14 patients (20 feet) with stiff clubfoot were prospectively selected from February 2018 to March 2021 in the Sixth Affiliated Hospital of Xinjiang Medical University. The 3D model of bone under weight-bearing condition was reconstructed by Mimics software according to the CT images of weight-bearing position. The central axis of the required bone was fitted by 3-Matic. The images of weight-bearing positive position, lateral position and calcaneal axial position were obtained by selective projection function. The related indexes of rigid equinovarus were measured. The related indexes of 14 adult patients with stiff clubfoot were measured by 3-Matic software measurement and routine X-ray measurement, and the statistical differences of the two groups were compared. This study was approved by the Ethics Committee of Xinjiang Medical University. All patients signed the informed consent.
RESULTS AND CONCLUSION: (1) There was no significant difference between the positive talus-calcaneal angle and the talus-first metatarsal angle measured by the two methods (P > 0.05), but there was significant difference between the calcaneal-cuboid angle measured by the two methods (P < 0.05). There was no significant difference between the two methods in lateral calcaneal-talus angle, tibial-calcaneal angle, talus-first metatarsal angle, and calcaneal-fifth metatarsal angle (P > 0.05). There was no significant difference in the axial tibial-calcaneal angle between the two methods (P > 0.05). (2) It is concluded that the central axis of the required bone can be accurately generated by using 3-Matic software, and then the accurate measurement of related indexes can be realized. The related bone and its central axis can be selectively projected during the measurement, and the ghosting interference can be eliminated. The measurement result is stable and reliable, and has the advantages of intuitive and clear observation.

Key words: clubfoot, rigid, 3-Matic software, digitization

CLC Number:

Liu Wei, Li Fei, Li Lubing, Wang Xue, Wang Chengwei. Reliability and accuracy of digital software in measuring osseous markers related to stiff clubfoot[J]. Chinese Journal of Tissue Engineering Research, 2022, 26(6): 886-891.

Figures/Tables 4

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