Phalloplasty

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Phalloplasty is the construction or reconstruction of a penis, or the artificial modification of the penis by surgery, often for cosmetic purposes. The term phalloplasty is also occasionally used to refer to penis enlargement.

The first phalloplasty done for the purposes of sexual reassignment was performed on trans man Michael Dillon in 1946 by Dr. Harold Gillies, which is documented in Pagan Kennedy's book The First Man-Made Man.

Indications[edit]

A complete construction or reconstruction of a penis is done on:

Techniques and related procedures[edit]

There are four different techniques for phalloplasty. All of the techniques involve taking a graft of tissue from a donor site and extending the urethra.

Surgery on cisgender males is more simple than on transgender males, because the urethra requires less lengthening. The urethra of a trans man ends near the vaginal opening and has to be lengthened considerably. The lengthening of the urethra is when most complications occur.

With all types of phalloplasty in trans men, scrotoplasty can be performed using the labia majora (vulva) to form a scrotum where prosthetic testicles can be inserted. If vaginectomy, hysterectomy and/or oophorectomy have not been performed, they can be done at the same time.

Unlike metoidioplasty, phalloplasty requires an implanted erectile prosthesis to achieve an erection (and enable sexual penetration). This is usually done in a separate surgery to allow time for healing. There are several types of erectile prostheses, including malleable rod-like medical devices that allow the neo-penis to either stand up or hang down. Penile implants require a neophallus of appropriate length and volume in order to be a safe option. The long term success rates of implants in constructed penises are less than the success rates of reconstruction in cisgender men. Good sensation in the reconstructed penis can help reduce the risk of the implant eventually eroding through the skin.[1]

Earlier techniques used a bone graft as part of reconstruction. Long-term follow-up studies from Germany and Turkey of more than 10 years proved that these reconstructions maintain their stiffness without late complications. Unfortunately, it results in a penis that has no ability to become flaccid again without breaking the internal bone graft.

Lengthening can also be achieved by a procedure that releases the suspensory ligament where it's attached to the pubic bone, thereby allowing the penis to be advanced toward the outside of the body. The procedure is performed through a discreet horizontal incision located in the pubic region where the pubic hair will help conceal the incision site. No incision is made on the penis itself.

As of November 2009, there is research in progress to synthesize corpora cavernosa (erectile tissue) in the lab on rabbits for eventual use in patients requiring penile construction surgery. Of the rabbits used in the preliminary studies, 8 had biological responses to sexual stimuli that was similar to the tissue of a male rabbit that was not part of the study.[2]

Techniques explained[edit]

Graft from the arm[edit]

An operation using the forearm as a donor site is the easiest to perform, but results in a cosmetically undesirable scar on the exposed area of the arm. Arm function may be hampered if the donor site does not heal properly. Electrolysis and/or laser hair reduction is required for a relatively hairless neophallus.

Sometimes a full-scale metoidioplasty is done a few months before the actual phalloplasty to reduce the possibility of complications after phalloplasty. Sensation is retained through the clitoral tissue at the base of the neophallus, and surgeons will often attempt to graft nerves together from the clitoris or nearby. Nerves from the graft and the tissue it has been attached to may eventually connect. This does not necessarily guarantee the ability to achieve genital orgasm after healing, as the most important task of nerve reconnection is to ensure the penis is able to sense injury.

The following explanation of this technique has many similarities to other approaches, but the construction of the glans differs.

  • The surgery starts (after the patient is prepped) with the forearm marked for graft size. After the graft is taken, another graft may be used to reconstruct the arm (resulting in a secondary scar).
  • The graft skin is dissected to expose the veins and antebrachial cutaneous nerves. (the latter done carefully for later reattachment)
  • If the urethra is being constructed at the same time as the phallus, it is joined at this step. If not, the glans is shaped. Sometimes glansplasty is done in a separate surgical stage after urethral extension.
  • A segment of vein going to the patient's groin is "borrowed" to allow easier joining of the graft with the preexisting tissues.
  • The vein is carefully attached to the femoral artery.
  • The blood supplies from the flap and the vein leading to the femoral artery are joined.
  • The clitoral hood and ligament is cut away, and the nerve bundle is isolated for the time being. Important: while this assumes the clitoral tissue is assimilated (buried) into the penis base, some surgeons give the option of leaving it as-is in a post metoidioplasty like state.
  • The flap is partially attached physically while the surgeon attempts to join the nerve bundles.
  • If the urethra was extended, it is now joined with a catheter that will remain in place for healing purposes for two to four weeks. Otherwise, the skin is sutured up and/or the scrotum is fabricated.

If the patient chooses to have the urethra extended to the glans of the neophallus, it is formed by the following steps:

  • The labia minora is injected with a mixture of saline and epinephrine.
  • It is then split open and layers separated using sharp and blunt dissection.
  • The layers are wrapped around a catheter and stitched.
  • A mucosal flap from the vagina may be used to bridge the urethra with the extension. This is often done in a separate procedure. Alternative graft locations include the mouth/cheeks or experimentally, the intestines. If the labia minora is not used during construction of the urethral extension, (or in the chance there is enough material remaining) it can be used during glansplasty to provide for better results compared with a full thickness skin graft.

Graft from the side of the chest[edit]

A relatively new technique involving a graft from the side of the chest under the armpit (known as a musculocutaneous latissimus dorsi free transfer flap) is a step forward in phalloplasty. The advantages of this technique over the older forearm flap technique include:

  • Hairlessness (little to no electrolysis needed)
  • Aesthetic appearance of normally colored skin (the glans may be tattooed to proper color)
  • Capable of tactile sensation (as with any form of phalloplasty, this does not necessarily mean the ability to have a genital orgasm after healing, as the erogenous zone is limited to the base of the penis)
  • Leaves an inconspicuous scar
  • Has a lower occurrence of complications from both the initial surgery and the erectile prosthesis insertion

This is a three part surgery that takes place over a period of six to nine months. The steps consist of:

Neophallus creation using MLD free flap

  • The surgery starts (after the patient is prepped) with the side of the chest marked for graft size.
  • The graft skin is dissected to expose the veins and the thoracodorsal nerves.
  • The graft, while still attached to the blood supply, is formed to a rough phallus shape by rolling the edges together.
  • A segment of vein going to the patient's groin is "borrowed" to allow easier joining of the graft with the preexisting tissues.
  • The vein is carefully attached to the femoral artery.
  • The blood supplies from the flap and the vein leading to the femeral artery are joined.
  • The clitoral hood and ligament are cut away and the nerve bundle is isolated.
  • The flap is partially attached physically while the surgeon attempts to join the nerve bundles.

During initial recovery, the neophallus is protected from contact with other tissues with a specially constructed dressing as to avoid blood supply complications.

After three months, urethroplasty (urethral extension) is performed.

  • The neophallus is dissected and a buccal (oral) mucosa graft inlaid into the created cavity and extended to the native urethra and joined to permanently allow urination while standing
  • A catheter is placed for several weeks to allow for proper healing

After another three to six months, a device that allows an erection can be inserted.

Graft from the leg[edit]

The lower leg operation is similar to forearm graft with the exception that the donor scar is easily covered with a sock and/or pants and hidden from view. Other details are same as forearm graft, especially the need for permanent hair removal before the operation. A graft from the leg or another area where the scar is less noticeable may be combined with free forearm graft to sculpt the glans penis.

Pubic area flap[edit]

The graft location is around the pelvic bone, usually running across the abdomen under the belly button. As such, there is a large horizontal scar that may not be aesthetically acceptable. The grafts have a less natural appearance and may not maintain an erectile implant long term. Electrolysis is required before surgery with the alternative being clearing of hair via shaving, or chemical depilatory.

Gillies technique[edit]

This technique was pioneered by Sir Harold Delf Gillies as one of the first competent phalloplasty techniques. It was simply a flap of abdominal skin rolled into a tube to simulate a penis, with urethral extension being another section of skin to create a "tube within a tube." Early erectile implants consisted of a flexible rod. A later improvement involved the inclusion of a blood supply pedicle which was left in place to prevent tissue death before it was transplanted to the groin. Most latter techniques involve tissues with attached pedicle.

Abdominal muscle[edit]

Skin grafted muscle flaps have fallen from popularity. This procedure is a minimum of 3 steps and involves implantation of an expansion balloon to facilitate the amount of skin needed for grafting. The grafts have a less natural appearance and are less likely to maintain an implant erectile long term.

Future[edit]

In the future, bioengineering may be used to create fully functional penises.[3]

Common complications[edit]

As phalloplasty has improved over the decades, the risks and complications from surgery have been reduced. However, there is still a possibility of a need for revision surgery to repair incorrect healing.

A study of post-op men showed that on average, 25% had one or more serious complications of the neopenis. The ones reported consisted of:

  • Loss of the phallus from either disease or blood supply issues
  • Cephalic vein thrombosis (blood clot)
  • Arterial ischemia (shortage of blood supply)
  • Infection
  • Distal limited necrosis (death of parts of the penis)
  • Hematoma (bruise)

In the same study, chances of complications of the extended urethra were higher, averaging 55%. The most common complications reported were:

  • Urinary fistula (hole) requiring perineal urethrostomy
  • Urinary fistula (hole) with conservative treatment
  • Urinary retention (from stenosis or narrowing of the new urethra)
  • (Erectile) prosthesis change (from complications)
  • (Erectile) prosthesis explantation (removal of the prosthesis without replacement)

See also[edit]

References[edit]

  1. ^ Erectile Implants in Female-to-Male Transsexuals: Our Experience in 129 Patients by Piet B. Hoebeke, Karel Decaestecker, Matthias Beysens, Yasmin Opdenakker, Nicolaas Lumen and Stan M. Monstrey (European Urology, February 2010)
  2. ^ Bioengineered corporal tissue for structural and functional restoration of the penis by Kuo-Liang Chen, Daniel Eberli, James J. Yoo, and Anthony Atala (Proceedings of the National Academy of Sciences, Vol. 106 No. 45, November 9, 2009)
  3. ^ Chen KL, Eberli D, Yoo JJ, Atala A (November 2009). "Regenerative Medicine Special Feature: Bioengineered corporal tissue for structural and functional restoration of the penis". Proceedings of the National Academy of Sciences of the United States of America 107 (8): 3346–50. doi:10.1073/pnas.0909367106. PMC 2840474. PMID 19915140. 

External links[edit]