Turkish Neurosurgery
Posterior Wall Defect of Sacrum: An Anatomical Study of Sacral Spina Bifida
Göksin Nilüfer Demirci Yonguc1, Salih Sayhan1, Sibel Cirpan1, Burcu Bulut2, Mustafa Güvençer1, Sait Naderi3
1Dokuz Eylul University, School of Medicine, Anatomy, İzmir,
2Hatay Mustafa Kemal University, School of Medicine, Anatomy, Hatay,
3Health Sciences University, Ümraniye Education and Research Hospital, Neurosurgery, İstanbul,
DOI: 10.5137/1019-5149.JTN.29180-20.3

Aim:The aim of the present study is to investigate the incidence, types, morphological and morphometric properties of spina bifida on dry sacral bones.Material and Methods:110 dry adult sacrums gathered from the bone collections of the Laboratory of the Anatomy Department of Dokuz Eylul University School of Medicine were examined. The parameters analysed were: 1)results of parameters related to the posterior sacral wall; 2)classification and rate of the closure defects; 3) classification of the top sacral vertebrae according to the shape of its superior surface; 4) presence of sacralisation and lumbalisation among sacrums with dorsal wall defects; 5) vertebral levels of apex of the sacral hiatus; and 6) vertebral levels of closure defects of the sacrums.Results:We determined 22/110 (20%)sacrums demonstrated spina bifida. Of these 22 sacrums, 4 (18.18%) showed complete and 18 (81.82%) showed incomplete spina bifida. We noted the coexistence of spina bifida with sacralisation (6/22 [27.27%]) and lumbalisation (5/22 [22.73%]). The types of defects were described and grouped as ‘V’ (Type 1), inverse ‘V’ (Type 2), window (Type 3), foramen (hole) (Type 4), sand watch (Type 5), narrow linear (Type 6), wide linear (Type 7), and bridged (Type 8). The shape of upper surfaces of the sacrums with spina bifida was grouped as: cavity (20/22, 90.9%), hump (1/22, 4.5%), and flat (1/22, 4.5%).Conclusion:A precise definition of the anatomical variations of sacrums is essential for surgeons, particularly when operating using endoscopic techniques and for anaesthesiologists applying caudal epidural block.

Corresponding author : Mustafa Güvençer