Welcome to the forum!
Thought this earlier posting from James C. might help answer your specific questions on injections and give you some general information on penile rehab. By the way, Dr. Mulhall's book goes into detail on injections, and in summary, yes the injections do help with penile rehab.
"Here's a link to an excellent video presentation whose viewing should be required of all new arrivals seeking options for PCa treatment. A video presentation titled "Sexual Problems in the Male Cancer Patient", concerning Erectile Dysfunction by Dr. John Mulhall of Memorial Sloan Kettering and author of the book "Saving Your Sex Life." Consisting of 4 parts, total time of about an hour and a half, it contains an address to a PCa Cancer Patient group and contains of of the most through and up to date information available. Well worth the time for anyone who is contemplating their method of treatment after a PCa diagnosis.
www.mskcc.org/mskcc/html/94910.cfm<!-- Edit -->
Post Edited (James C.) : 6/7/2010 9:31:11 AM (GMT-6)"
PSA 2007 - 2.8; 11/24/2008 - 7.6; PCa Dx 2/11/09; age at Dx 62; RLP 4/20/09
Biopsy - Invasive moderately differentiated prostatic andenocarconoma; G 3+3=6; PT2C; No evidence of Seminal Vesicle or Extraprostatic Involvement; Margins clear; Tumor identified in sections from prostatic apex. 70 gram prostate. Continent after removal of cath.
ED - Trimix works well; levitra @ 90%
PSA - <0.1, 8/10/11