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Papers of the Week

2022 Oct 14

Reg Anesth Pain Med

Retrodural space of Okada in the posterior ligamentous complex region: clinical and anatomical findings relevant to lumbar interlaminar epidural injection.


Kim S H, Cho T-H, Kim H J, Kwon H-J, Kwak H-H, Shin K-J, Lee Y S, Yang H-M
Reg Anesth Pain Med. 2022 Oct 14.
PMID: 36241348.


The retrodural space of Okada is a potential space posterior to the ligamentum flavum that allows communication with the bilateral facet joints. However, the actual anatomy of this space has not been clearly visualized to date. We sought to investigate the characteristics of patients showing contrast spreading to the facet joint space during epidural injection and to clarify the anatomical structures of the retrodural space and adjacent ligamentous tissues in cadaveric specimens.