Professional background

I qualified from St Bartholomew's Hospital, London with surgical training in Cambridge and urological specialist training in London. I have been a consultant at UCLH since 2001, although only formally appointed in 2004.

My specialist interests are medical and surgical treatments for the penis and male factor infertility. This includes microsurgery techniques up to major free flap penile reconstructions. I am part of the tertiary andrology referral service at UCLH. Erectile dysfunction and Peyronie's surgery also comprises a large component and this includes penile prosthesis surgery.


Research interests

Erectile dysfunction, male factor infertility, penile reconstruction.


  • Garaffa G, Minervini A, Christopher NA, Minhas S, Ralph DJ. The management of residual curvature after penile prosthesis implantation in men with Peyronie's disease. BJU Int. 2011 Oct;108(7):1152-6. doi: 10.1111/j.1464-410X.2010.10023.x. Epub 2011 Feb 11. PubMed PMID: 21314814.
  • Garaffa G, Shabbir M, Christopher N, Minhas S, Ralph DJ. The surgical management of lichen sclerosus of the glans penis: our experience and review of the literature. J Sex Med. 2011 Apr;8(4):1246-53. doi: 10.1111/j.1743-6109.2010.02165.x. Epub 2011 Jan 6. Review. PubMed PMID: 21210959.
  • Raheem AA, Garaffa G, Raheem TA, Dixon M, Kayes A, Christopher N, Ralph D. The role of vacuum pump therapy to mechanically straighten the penis in Peyronie's disease. BJU Int. 2010 Oct;106(8):1178-80. doi: 10.1111/j.1464-410X.2010.09365.x. PubMed PMID: 20438558.
  • Garaffa G, Ralph DJ, Christopher N. Total urethral construction with the radial artery-based forearm free flap in the transsexual. BJU Int. 2010 Oct;106(8):1206-10. doi: 10.1111/j.1464-410X.2010.09247.x. PubMed PMID: 20201834.
  • Garaffa G, Sacca A, Christopher AN, Ralph DJ. Circumcision is not mandatory in penile surgery. BJU Int. 2010 Jan;105(2):222-4. Epub 2009 Jul 7. PubMed PMID: 19594732.
  • Garaffa G, Christopher NA, Ralph DJ. Total phallic reconstruction in female-to-male transsexuals. Eur Urol. 2010 Apr;57(4):715-22. Epub 2009 May 19. PubMed PMID: 19477578.
  • Ralph DJ, Garffa G, Christopher AN. Editorial comment on: erectile implants in female-to-male transsexuals: our experience in 129 patients. Eur Urol. 2010 Feb;57(2):340-1. Epub 2009 Mar 10. PubMed PMID: 19303204.
  • Garaffa G, Raheem AA, Christopher NA, Ralph DJ. Total phallic reconstruction after penile amputation for carcinoma. BJU Int. 2009 Sep;104(6):852-6. Epub 2009 Feb 23. PubMed PMID: 19239449.
  • Ralph DJ, Garaffa G, Muneer A, Freeman A, Rees R, Christopher AN, Minhas S. The immediate insertion of a penile prosthesis for acute ischaemic priapism. Eur Urol. 2009 Dec;56(6):1033-8. Epub 2008 Oct 1. PubMed PMID: 18930579.
  • Garaffa G, Christopher N, Ralph DJ. The management of genital lymphoedema. BJU Int. 2008 Aug;102(4):480-4. Epub 2008 Mar 5. PubMed PMID: 18325055.
  • Garaffa G, Bettocchi C, Christopher N, Ralph D. Plexiform neurofibroma of the penis associated with erectile dysfunction due to arterial steeling. J Sex Med. 2008 Jan;5(1):234-6. Epub 2007 Oct 24. PubMed PMID: 17961147.
  • Agrawal V, Dangle P, Minhas S, Ralph D, Christopher N. Recurrent arteriovenous malformation of the scrotum secondary to pelvic trauma. Urol Int. 2006;77(4):365-7. PubMed PMID: 17135789.
  • Hegarty PK, Kayes O, Freeman A, Christopher N, Ralph DJ, Minhas S. A prospective study of 100 cases of penile cancer managed according to European Association of Urology guidelines. BJU Int. 2006 Sep;98(3):526-31. PubMed PMID: 16925747.
  • Kalsi JS, Christopher N, Ralph DJ, Minhas S. Plaque incision and fascia lata grafting in the surgical management of Peyronie's disease. BJU Int. 2006 Jul;98(1):110-4; discussion 114-5. PubMed PMID: 16831154.
  • Li CY, Kayes O, Kell PD, Christopher N, Minhas S, Ralph DJ. Penile suspensory ligament division for penile augmentation: indications and results. Eur Urol. 2006 Apr;49(4):729-33. Epub 2006 Jan 31. PubMed PMID: 16473458.
  • Kalsi J, Minhas S, Christopher N, Ralph D. The results of plaque incision and venous grafting (Lue procedure) to correct the penile deformity of Peyronie's disease. BJU Int. 2005 May;95(7):1029-33. PubMed PMID: 15839925.
  • Muneer A, Kalsi J, Christopher N, Minhas S, Ralph DJ. Plaque incision and grafting as a salvage after a failed Nesbit procedure for Peyronie's disease. BJU Int. 2004 Oct;94(6):878-80. PubMed PMID: 15476526.
  • Kalsi JS, Bahadur G, Muneer A, Ozturk O, Christopher N, Ralph DJ, Minhas S. Novel PDE5 inhibitors for the treatment of male erectile dysfunction. Reprod Biomed Online. 2003 Oct-Nov;7(4):456-61. Review. PubMed PMID: 14656408.