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. 2021 Nov 23;22(1):979.
doi: 10.1186/s12891-021-04872-8.

Association between subtalar articular surface typing and flat foot deformity: which type is more likely to cause flat foot deformity

Lei Zhang #  1   2   3   4 , Xiaoyao Peng #  5 , Siyuan He #  6 , Xin Zhou  1   2   3   4 , Gang Yi  1   2   3   4 , Xiaogao Tang  1   2   3   4 , Bingkun Li  1   2   3   4 , Guoyou Wang  7   8   9   10 , Wanxue Zhao  5 , Yuening Yang  5
Affiliations

Association between subtalar articular surface typing and flat foot deformity: which type is more likely to cause flat foot deformity

Lei Zhang et al. BMC Musculoskelet Disord. .

Abstract

Background: Previous studies have shown a wide range of anatomical classifications of the subtalar joint (STJ) in the population and this is related to the different force line structures of the foot. Different subtalar articular surface morphology may affect the occurrence and development of flat foot deformity, and there are fewer studies in this area. The main objective of our study was to determine the association of different subtalar articular surface with the occurrence and severity of flat foot deformity.

Methods: We analyzed the imaging data of 289 cases of STJ. The articular surface area, Gissane's angle and Bohler's angle of subtalar articular surface of different types were counted. The occurrence and severity of flat foot deformity in different subtalar articular surface were judged by measuring the Meary angle of foot.

Results: We classified 289 cases of subtalar articular surface into five types according to the morphology. According to Meary angle, the flat foot deformity of Type I and Type IV are significantly severer than Type II (P < 0.05). Type II (7.65 ± 1.38 cm2) was significantly smaller than Type I (8.40 ± 1.79 cm2) in the total joint facet area(P < 0.05). Type III (9.15 ± 1.92 cm2) was smaller than Type I (8.40 ± 1.79 cm2), II (7.65 ± 1.38 cm2) and IV (7.81 ± 1.74 cm2) (P < 0.05). Type II (28.81 ± 7.44∘) was significantly smaller than Type I (30.80 ± 4.61 degrees), and IV (32.25 ± 5.02 degrees) in the Bohler's angle (P < 0.05). Type II (128.49 ± 6.74 degrees) was smaller than Type I (131.58 ± 7.32 degrees), and IV (131.94 ± 5.80 degrees) in the Gissane's angle (P < 0.05).

Conclusions: After being compared and analyzed the measurement of morphological parameters, joint facet area and fusion of subtalar articular surface were closely related to the severity of flat foot deformity and Type I and IV were more likely to develop severer flat foot deformity.

Level of evidence: Level III, retrospective comparative study.

Keywords: Flat foot; Meary angle; Subtalar joint.

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Conflict of interest statement

The authors declare that they have no competing interests.

Figures

Fig. 1
Fig. 1
3D reconstruction of subtalar articular surface after CT scanning. a Type I, the anterior and middle facets of calcaneus fused in a continuous and spindle shape facet, and separated from the posterior facet. b Type II, the anterior, middle, and posterior facets of calcaneus were present independently. c Type III, the anterior facet of calcaneus was absent, and the middle and posterior facets were present independently. d Type IV, the anterior and middle facets of calcaneus fused in a continuous and calabash shape facet, and separated from the posterior facets. e Type V, the anterior facet of calcaneus was absent, and the middle and posterior facets were fused in a continuous facet
Fig. 2
Fig. 2
The measurement of total joint facet area. a AB: the long-axis of the anterior facet of calcaneus, CD: the short-axis of the anterior facet of calcaneus; b EF: the long-axis of the middle facet of calcaneus, GH: the short-axis of the middle facet of calcaneus; c IJ: the long-axis of the posterior facet of calcaneus, KL: the short-axis of the posterior facet of calcaneus. Total joint facet area = AB*CD + EF*GH + IJ*KL
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