title: Types of subtalar joint facets.
abstract: Articular facets of the clinical subtalar joint (CSTJ) were analyzed using a total of 118 (right 57, left 61) dry, paired calcanei and tali from 68 Korean adult cadavers. The CSTJ facets were classified into the following three types depending on their continuity: type A, all three facets are separated; type B, the anterior and middle facets are partially connected; and type C, the anterior and middle facets are fused to form a single facet. The continuity between the anterior and middle facets was represented by the degree of separation (DS), which ranged between 2.00 (type A) and 1.00 (type C). Type A was most common (39.0 %) in calcanei and rarest (11.0 %) in tali. Matching of calcaneus-talus pairs yielded five combined types: A-A (11.0 %), A-B (28.0 %), B-B (18.6 %), B-C (13.6 %), and C-C (28.8 %). The mean DS was slightly greater in calcanei (1.53) than in tali (1.32), and decreased in the order of types A-A, A-B, B-B, B-C, and C-C. The intersecting angles between the anterior and middle facets, which are related to the mobility of the CSTJ, were inversely related to the DS. These findings indicate that the anterior and middle facets are fused more frequently in tali than in calcanei, and combinations of different CSTJ facet types (A-B, B-C) exist over 40 % of feet. Our results indicate that types with a smaller DS (such as B-C and C-C) are relatively mobile but less stable compared to those with a greater DS (such as A-A and A-B).
authors.affiliation: Department of Anatomy, Yonsei University Wonju College of Medicine, 20 Ilsan-ro, Wonju, Kangwon-Do, Republic of Korea.
authors.forename: Min-Ho
authors.initials: MH
authors.lastname: Jung
authors.forename: Byoung Young
authors.initials: BY
authors.lastname: Choi
authors.forename: Ji Yong
authors.initials: JY
authors.lastname: Lee
authors.forename: Chang Sung
authors.initials: CS
authors.lastname: Han
authors.forename: Jin Suk
authors.initials: JS
authors.lastname: Lee
authors.forename: Young Chul
authors.initials: YC
authors.lastname: Yang
authors.forename: Byung Pil
authors.initials: BP
authors.lastname: Cho
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002102:Cadaver; D002111:Calcaneus / Q000033:anatomy & histology*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D056910:Republic of Korea; D013380:Subtalar Joint / Q000033:anatomy & histology*
references.citation: J Anat. 1958 Oct;92(4):616-20
references.pmid: 13587395
references.citation: Foot Ankle. 1984 Sep-Oct;5(2):54-66
references.pmid: 6500411
references.citation: Acta Anat (Basel). 1989;134(2):124-7
references.pmid: 2718725
references.citation: Anat Anz. 1979;146(4):377-80
references.pmid: 546269
references.citation: J Orthop Sports Phys Ther. 1987;8(10):489-94
references.pmid: 18797028
references.citation: Anat Anz. 1986;161(5):389-92
references.pmid: 3729007
references.citation: Kathmandu Univ Med J (KUMJ). 2006 Jan-Mar;4(1):75-7
references.pmid: 18603873
references.citation: Ergonomics. 2000 Oct;43(10):1718-25
references.pmid: 11083150
references.citation: Surg Radiol Anat. 2011 Sep;33(7):623-30
references.pmid: 21340734
references.citation: Surg Radiol Anat. 2012 Aug;34(6):487-91
references.pmid: 22327639
references.citation: Clin Orthop Relat Res. 1983 Jul-Aug;(177):9-15
references.pmid: 6861413
references.citation: Arch Orthop Trauma Surg. 2009 Jul;129(7):909-14
references.pmid: 18810474
references.citation: J Anat. 1965 Jan;99:71-6
references.pmid: 14245347
references.citation: Acta Anat (Basel). 1974;89(1):134-8
references.pmid: 4846335
references.citation: Surg Radiol Anat. 1997;19(2):111-7
references.pmid: 9210245
references.citation: Clin Orthop Relat Res. 1993 May;(290):17-26
references.pmid: 8472445
references.citation: J Anat. 1977 Dec;124(Pt 3):651-5
references.pmid: 604335
references.citation: Anat Rec. 1965 Sep;153(1):1-17
references.pmid: 5885336
references.citation: J Anat. 1993 Dec;183 ( Pt 3):631-4
references.pmid: 8300440
references.citation: Clin Anat. 2008 Sep;21(6):581-6
references.pmid: 18567019