Abstract
It is speculated by many penile prosthesis implanters that rear tip extenders (RTEs) negatively affect axial loading so they should be avoided if possible but many implanters use RTE to assist with exit tubing angle thus justify their presence. However, the biomechanical effects of RTEs in the body have not been reported. In this study, two groups of Coloplast Titan inflatable penile implant (IPP) IPP-RTE pairs of total length of 20 and 24cm, respectively with lengths of RTEs ranging from 0, 2 and 4cm have been investigated to provide experimental evidence. 3 cadavers were obtained. Penile stretch length, corporal length, and pendulous shaft dimensions were obtained. Artificial erections and cavernosograms were performed on the 3 cadavers and one was excluded for Peyronie’s disease. The IPPs were surgically placed into two fresh cadavers via a penoscrotal technique by a high volume surgeon. The implants were confirmed to be placed correctly using fluoroscopy. The IPPs were assessed by column compression and cantilever deflection. A biomechanical evaluation of the properties of each IPP-RTE pairs inside the fibroelastic tunica albuginea was based on industry standard methods for assessment at 1034mmHg (20psi) fill pressure. X-ray images were obtained before and after kink formation.
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