{
  "abstract": "Background and Aims The presence of nociceptors has been illustrated in the posterior capsule of hip joint. The articular nerves to the posterior capsule emerge from nerve to quadratus femoris (NQF), superior gluteal nerve (SGL), sciatic nerve (SN) and inferior gluteal nerves (IGN) which are in relation to pyriformis and the quadratus femoris muscle. We hypothesize that a single injection deep to pyriformis would stain these nerves.Methods In 6 soft embalmed cadavers (12 specimens) in lateral position, 10 ml blue latex dye injected deep to the pyriformis muscle using ultrasound guidance. Thirty minutes following injection, open dissections in 6 specimens and cross-sections in 6 specimens were performed. At open dissection, the following nerves were evaluated for dye soakage: Superior (SGN) and inferior gluteal nerves (IGN), nerve to quadratus femoris (NQF) and the sciatic nerve (SN). In the cross-sections, the following planes would be investigated: Pathways of SGN, IGN, NQF and SN.Results During dissection, dye was found superficial to the piriformis: in the supra-piriformis plane staining the SGN in all 12 specimens. Dye spread deep to the piriformis: in sub-piriformis plane staining the IGN in all 12 specimens. The dye spread was longitudinal towards the SN, which was stained in all 12 specimens. NQF was stained in only 2/12 specimens and the Pudendal nerve was stained in 1/12 specimens. Posterior cutaneous nerve of thigh (PCNT) was not stained in all dissections (0/12).Conclusions Based on our cadaveric study, infra-piriformis injection stains the nerves supplying the posterior capsule: SGN, IGN & SN in all 12 specimens, however NQF was stained in only 2/12 specimens. Moreover, future clinical research based on our cadaveric study will be done to analyze the outcome.",
  "authors": [
    {
      "affiliations": [
        "Anaesthesiology, Sancheti Institute of Orthopedics and Rehabilitation, Pune, India"
      ],
      "name": "Sandeep Diwan"
    },
    {
      "affiliations": [
        "Anaesthesiology, Sancheti Institute of Orthopedics and Rehabilitation, Pune, India"
      ],
      "name": "Navveen PM"
    }
  ],
  "title": "P088 Investigation of dye diffusion after an infra-piriformis injection at the level of greater sciatic notch- a cadaveric study",
  "uid": "9a07d3b0-f083-5755-aadc-4b8bfa6a9c33"
}