Reza Firoozabadi - Department of Orthopaedic Surgery and Sports Medicine, Harborview Medical Center, Seattle, WA USA
Milton Routt - Department of Orthopaedics Surgery, The University of Texas Medical School at Houston, Houston, TX USA
Paul Stafford - Orthopedic and Trauma Service of Oklahoma, Tulsa, OK USA

  Background: Anterior pelvic ring surgery includes a variety of plating techniques and insertion of retrograde superior pubic ramus screws. Anterior acetabular surgery also includes fixation through an ilioinguinal or Stoppa approach. These exposures risk injury to the spermatic cord and accompanying genital branch of the genitofemoral nerve. The primary aim of this study was to identify the distance between the midline and the spermatic cords in adult male cadaveric specimens. The secondary aim was to determine spermatic cord diameters and measure the distance between the spermatic cord and implant during instrumentation of a retrograde superior pubic ramus medullary screw. Methods: Extended Pfannenstiel and Stoppa approaches were performed on ۱۸ embalmed male cadavers bilaterally. Spermatic cord characteristics were recorded and a number of measurements were performed to determine the distance of implants and the midline from the spermatic cord. Results: The average distance between the midline and spermatic cords was ۳۴.۲ mm. The average distance between the spermatic cord and implant was ۱۸.۲ mm. Eleven of the thirty-six dissections had abnormalities including cord lipomas and inguinal hernias. The average cord diameter was ۱۸.۶ mm. The average cord diameter in those with abnormalities was ۲۴.۹ mm and ۱۶ mm in those without abnormalities, this difference was statistically significant. Discussion: Due to the proximity of the spermatic cord, the surgeon should either formally expose the cord or limit lateral dissection from the midline during Pfannenstiel and Stoppa exposures. Similarly, the surgeon should use soft-tissue sleeves and oscillating drills to avoid injury to the contralateral spermatic cord during the insertion of retrograde superior pubic ramus medullary screws.

Acetabular surgery, Ilioinguinal approach, Retrograde ramus screw, Spermatic cord, Stoppa