WellStar Atlanta Medical Center 1 article published in JoVE Medicine Posterior Approach for Debridement of the Psoas Abscess Emilio E. Grau-Cruz1, Ali Nourbakhsh2 1Orthopedics Department, WellStar Atlanta Medical Center, 2Spine Surgery Division, Orthopedics Department, WellStar Atlanta Medical Center This is a cadaveric study investigating the landmarks for the posterior approach for irrigation and debridement of the psoas abscess. The interval between the transverse processes (TP) was used to access the substance of the psoas muscle.