If you are on the fence about getting an implant, my recommendation is to make sure your penis "gets a workout" daily so that no elasticity or size is lost. Whether that is with pills injections or a vacuum erection device (the least invasive means of that exercise).
In a fully functional man, his penis gets a number of nighttime erections. Blood flow and stretching to size are important to maintain penile health. Artificially induced erections can emulate that healthy process.
Vacuum Preparation, Optimization of Cylinder Length and Postoperative Daily Inflation Reduces Complaints of Shortened Penile Length Following Implantation of Inflatable Penile Prosthesis
http://file.scirp.org/pdf/ASM_2013012514045982.pdfSuggests that pre-op prep can 1) reduce post-op pain, 2) reduce post-op recover time and 3) make insertion easier as well as 4) the original focus on minimizing loss of length.
A pilot study to determine penile oxygen saturation before and after vacuum therapy in patients with erectile dysfunction after radical prostatectomy.
https://www.ncbi.nlm.nih.gov/pubmed/24506138