After a successful penile implant, a small number of men notice that the shaft of the penis is firm but the head (glans) stays soft or droops downward. This is known as floppy glans syndrome — sometimes called the SST (Supersonic Transport) deformity because of the downward-pointing shape. It is not dangerous, and it is correctable. This guide explains why it happens and what can be done about it.
What is floppy glans syndrome?
A penile prosthesis supports the two erection chambers of the shaft (the corpora cavernosa). The glans, however, gets its firmness from a separate structure — the corpus spongiosum — which the implant does not support. If the glans does not engorge well on its own, it can remain soft even when the implanted shaft is fully rigid. The result is a firm shaft with a floppy, sometimes downward-tilting head.
Why does it happen?
- Reduced natural blood flow to the glans (common in diabetes or vascular disease)
- The implant cylinders sitting slightly short of the glans
- Nerve or tissue changes after previous pelvic surgery
- Individual anatomy of the glans and its blood supply
Because the glans firmness depends on natural engorgement, floppy glans is more likely in men who already had poor glans filling before surgery.
How is it treated?
Floppy glans syndrome is manageable, and the right approach depends on how much it bothers the patient:
- Reassurance: If mild and not affecting intercourse, no treatment may be needed.
- Medication: In some men, oral erection medication or other measures can improve natural glans engorgement.
- Glans fixation (glanspexy): A minor corrective procedure that secures the glans to the underlying tissue so it sits firm and supported over the implant — the definitive solution for troublesome cases.
An Uroandrologist can assess the cause and recommend the least invasive option that gives a good, stable result.
Frequently Asked Questions
Is floppy glans syndrome common?
It affects only a minority of implant patients, and many cases are mild. It is well recognised and correctable, so it should not put anyone off implant surgery.
Does it mean my implant has failed?
No. The implant is working correctly — it firms the shaft. Floppy glans relates only to the head of the penis, which the implant does not directly support, and it can be corrected separately.
Can it be corrected after surgery?
Yes. If it develops or persists after your implant, a glans-fixation procedure can be performed to give the head firm, natural-looking support.
This article is for general education and awareness only and is not a substitute for professional medical advice. Please consult a qualified doctor about your individual situation.
Concerned about your implant result?
Get a confidential assessment from Dr. Kalpesh Kapadia, MCh Uroandrologist, Ahmedabad.