Non-Surgical Penile Lengthening (Traction Therapy)
Non-surgical penile lengthening is carried out with medical devices that apply a gentle, continuous traction force to the penis, without any need for surgery. The method rests on the principle of tissue adaptation to mechanical stretch (mechanotransduction): continuous, controlled stretching encourages the cells of the tissue to proliferate and can produce lengthening over time.
The greatest advantage of this method is its low risk and the absence of surgery; its greatest disadvantage is that it demands patience and consistency — results appear over months and only with regular use. This guide sets out the realistic expectations supported by clinical studies.
How Does a Traction Device Work?
Traction devices apply a light but continuous stretching force to the penis. At cellular level this force becomes a stimulus that triggers tissue renewal and lengthening. In the medical literature this process of cellular stimulation is called mechanotransduction.
In laboratory studies on human tunica albuginea (the sheath of the penis) cells, rhythmic traction applied to the tissue was shown to increase smooth muscle alpha-actin and Hsp47 proteins. When the body senses this stretching force it activates metalloproteinase-8 (MMP-8) and collagenase enzymes; these break down the old tissue and, through cell division, allow a new, healthy and longer collagen network to be woven in its place. Through this adaptation the penis expands its physiological limits in volume.
The same principle is used in Peyronie’s disease (penile curvature) to reduce the curvature. Modern devices (for example RestoreX, PeniMaster PRO) report results similar to or better than the 4–8 hours a day required by earlier generations, with short daily sessions of 30–90 minutes.
How Much Length? The Clinical Evidence
Traction therapy is among the penile lengthening methods with the most randomised controlled trial data. The main studies treated as reference points by the international urology community give the following results.
| Study (year) | Device | Daily use | Mean length gain |
|---|---|---|---|
| Gontero (2009) | Penis extender | 4–6 hours/day | +2.3 cm (flaccid) |
| Moncada (2019) | PeniMaster PRO | 6–8 hours/day | +1.8 cm |
| Trost / Mayo Clinic (2021) | RestoreX | 30–90 min/day | +1.6 cm |
Gontero et al. (2009): in this pilot study published in BJU International, an average of six months of use for 4–6 hours a day produced a statistically significant permanent gain of 2.3 cm in flaccid length and 1.7 cm in stretched length. The most important finding was that when patients were remeasured at 12 months, the gain had been maintained without any loss.
Moncada et al. (PeniMaster PRO, 2019): in a multicentre study of 93 patients with Peyronie’s disease, 12 weeks of targeted use produced a mean lengthening of 1.8 cm together with a mean improvement in curvature of 38.4 degrees (51.4%).
Mayo Clinic Trost study (RestoreX, 2021): this randomised controlled trial published in the Journal of Urology showed that in men who had undergone prostate surgery, just 30–90 minutes of daily use preserved 1.6 cm of length compared with an untreated control group, with a clear advantage in rates of spontaneous erection.
Who Is Traction Therapy Suitable For?
The EAU and AUA, the most respected bodies in modern medicine in this field, point directly to particular patient groups for this method in their current clinical guidelines. Traction therapy is considered especially in the following situations:
- Men who do not want surgery and are looking for a low-risk method.
- Men with Peyronie’s disease (penile curvature): current AUA and EAU guidelines recommend traction devices (PTT) to reduce curvature and increase length. Traction used after injection treatments (Xiaflex/verapamil) is an integral part of «multimodal (combined) therapy».
- After prostate surgery (radical prostatectomy): the EAU 2026 updates note that a traction device successfully preserves tissue length in preventing post-operative penile shortening. This is a turning point in penile rehabilitation.
- After surgical lengthening, to prevent shortening (supportive treatment).
What Are the Side Effects?
In clinical studies the side effects have been found to be mild, temporary and self-limiting:
- Temporary redness of the skin (erythema)
- Temporary numbness or reduced sensation at the glans
- Skin irritation if the device is used incorrectly
Non-Surgical vs Surgical Lengthening
Procedures such as division of the suspensory ligament, or plication surgery for Peyronie’s disease, do not generally increase erect length; they simply bring a little more of the penis outside the body in the flaccid state. Indeed, in some curvature operations such as plication the tissue is folded, so a permanent shortening of 1–3 cm occurs. Traction device therapy, by contrast, produces an increase in both flaccid and erect length through cell proliferation, so it does not disturb the natural mechanism of the anatomy.
| Feature | Non-surgical (traction) | Surgical (ligament) |
|---|---|---|
| Lengthening | ~1.5–2.3 cm (over time) | Flaccid ~1.3–2 cm |
| Risk | Low (mild, temporary) | High (surgical risks) |
| Time | Months of daily use | Single procedure + recovery |
| Satisfaction | High (>80% in some series) | Low (~35% in some series) |
You can read the details of the surgical option on the surgical penile lengthening page, including the risk of paradoxical shortening.
What Determines Cost
Under healthcare regulations fixed prices cannot be published. The main variables are:
- Type and quality of the device: the technological differences between imported FDA/CE cleared devices such as RestoreX and older ones.
- Duration of treatment and follow-up programme.
- Accompanying treatments: for example combination injections for Peyronie’s disease.
Examination is advised so that the right device and protocol can be determined for you.
Key points
- Traction therapy lengthens tissue through mechanotransduction: stretch → MMP-8/collagenase → new collagen network.
- Gontero 2009: +2.3 cm flaccid, maintained at 12 months.
- Moncada 2019: +1.8 cm and 38.4° (51.4%) curvature improvement in Peyronie’s disease.
- Trost/RestoreX 2021: +1.6 cm after prostatectomy with only 30–90 min a day.
- Traction affects length only; it does not increase girth.
- Guideline-supported for Peyronie’s disease, post-prostatectomy rehabilitation and after lengthening surgery.
- Side effects are mild and temporary; never sleep with the device on.
- There is no evidence for jelqing; uncontrolled force can damage vessels and nerves.
- Requires patience: measurable results at 3–6 months of consistent daily use.
Frequently Asked Questions About Non-Surgical Lengthening
Does a traction device really work?
Clinical evidence supports a measurable gain in length (on average around 1.5–2.3 cm) when the device is used regularly over months. Results vary between individuals and continuity is required. This is one of the penile lengthening methods with the most randomised trial data.
How long does it take to see results?
Most users report a measurable difference within 3–6 months of regular daily use. Rapid results should not be expected; the gain accumulates over time with consistent use. Gains have been reported to be maintained at 12-month follow-up.
How many hours a day is required?
Older devices required 4–8 hours a day; modern devices (for example RestoreX) report similar results with 30–90 minutes of daily use. The exact duration depends on the device and on the protocol set by your doctor.
Does traction increase girth?
No. The effect of traction is on length; it does not increase circumference. For girth, methods such as filler or fat injection are considered.
Can I sleep with the device on? Would that speed things up?
Absolutely not. Involuntary erections and changes of position during sleep can damage the device and place severe pressure on the penis, which may lead to bleeding within the tissue or tissue death (necrosis). It should be used only during the waking hours advised by your doctor.
Can jelqing replace a device?
There is no scientific evidence (and no EAU/AUA support) in the medical literature that uncontrolled manual stretching methods such as jelqing lengthen the penis. On the contrary, disproportionate force can damage the blood vessels and nerves of the penis and cause lasting erectile problems. Genuine lengthening requires a stable, controlled mechanotransduction stimulus at microscopic scale.
How much does it cost?
Under healthcare regulations fixed prices cannot be published. The main variables are the type and quality of the device (the difference between modern FDA/CE cleared devices and older ones), the planned duration of treatment and follow-up programme, and any accompanying treatments such as those for Peyronie’s disease. Examination is advised; you may contact the clinic.
The right device and protocol for you are determined at examination.
Phone / WhatsApp: +90 543 913 8767
Scientific References
- Gontero P, et al. A pilot phase-II prospective study to test the efficacy and tolerability of a penile-extender device in the treatment of «short penis». BJU Int. 2009.
- Moncada I, et al. Penile traction therapy with the new device ‘Penimaster PRO’ is effective and safe in the stable phase of Peyronie’s disease: a controlled multicentre study. BJU Int. 2019.
- Trost L, et al. Efficacy of a Novel Penile Traction Device (RestoreX) in Improving Penile Length and Erectile Function Post Prostatectomy: a randomised controlled trial. J Urol. 2021.
- Penile Traction Therapy: A Contemporary Narrative Review of Clinical Evidence. 2025.
- EAU Guidelines on Sexual and Reproductive Health (2024–2026) & AUA Peyronie’s Disease Guideline.
This content is for general information only and does not replace examination by a physician. The results of the studies cited may vary with the product, technique and patient group. For an individual assessment, please consult a specialist physician.