Clinical Orthopaedics and Related Research

, Volume 466, Issue 10, pp 2527–2532 | Cite as

Differences in Innervation and Innervated Neurons between Hip and Inguinal Skin

  • Takayuki Nakajima
  • Seiji Ohtori
  • Shinji Yamamoto
  • Kazuhisa Takahashi
  • Yoshitada Harada
Original Article

Abstract

Pain originating from the hip may be referred to the groin and anterior thigh. We investigated sensory dorsal root ganglion neurons innervating the hip and the inguinal skin in rats using retrograde neurotransport and immunohistochemistry. A retrograde neurotracer Fluoro-Gold™ was injected into the left hip or inguinal skin of rats. Seven days later, we harvested bilateral dorsal root ganglions and counted the number of Fluoro-Gold™-labeled neurons positive for calcitonin gene-related peptide, a marker of nerve growth factor-dependent neurons, or isolectin B4, a marker of glial cell line-derived neurotrophic factor-dependent neurons. In the hip group, Fluoro-Gold™-labeled neurons were distributed throughout the left dorsal root ganglions from T13 to L5, primarily at L1, L2, L3, and L4, and the percentage of calcitonin gene-related peptide-positive neurons was higher than that of isolectin B4-binding neurons. In the inguinal skin group, Fluoro-Gold™-labeled neurons were distributed throughout the left dorsal root ganglions from T13 to L3, primarily at L1, L2, and L3, and the percentage of isolectin B4-binding neurons was higher than that of calcitonin gene-related peptide-positive neurons. These data suggest the sensory innervation pattern and characteristics of the sensory nerve of the rat hip are different from those of inguinal skin.

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Copyright information

© The Association of Bone and Joint Surgeons 2008

Authors and Affiliations

  • Takayuki Nakajima
    • 1
  • Seiji Ohtori
    • 1
  • Shinji Yamamoto
    • 1
  • Kazuhisa Takahashi
    • 1
  • Yoshitada Harada
    • 1
  1. 1.Department of Orthopaedic Surgery, Graduate School of MedicineChiba UniversityChuo-kuJapan

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