The bikini area and bikini line as a location for anterior subcutaneous pelvic fixation: an anatomic and clinical investigation.

Anterior external fixation for pelvic fractures has been the standard for acute stabilization but definitive treatment often leads to pin tract infection, is uncomfortable, and limits patient mobility. We recently developed a subcutaneous anterior pelvic fixator which addresses these issues (INFIX). The objective of this study is to introduce the Bikini Area and Bikini Line as the subcutaneous anatomical location where this apparatus is placed. A study was preformed on eight cadaveric specimens to define the location of the subcutaneous device with respect to anatomic structures. We examined 23 people of various body mass indexes to examine the anterior pelvic anatomy. This was followed by implantation on 42 individuals in whom we reviewed CT scans to assess the location of the implant. We asked these same 42 individuals whether they could sit, stand, and lie on their sides and if they had any discomfort. We measured the dimensions of 26 retrieved rods to approximate the curve of the Bikini Line. Finally in 14 individuals we performed vascular ultrasound to assess the flow in the iliac and femoral vessels with the implant in place in the sitting and standing position. Neurovascular structures are not affected by placing the INFIX device at the Bikini Line, patients are comfortable, mobile and complications are minimized by this procedure. A rod placed on the Bikini Line which connects screws inserted into the anterior inferior iliac spine on each side does not interfere with sitting, standing, or the neurovascular structures.