JPS at 15 Weeks: The Only Hip Dysplasia Surgery That Has to Happen Before Anything Looks Wrong

Juvenile pubic symphysiodesis, JPS, is a short operation that fuses a growth plate on the underside of a puppy's pelvis so that, as the rest of the pelvis keeps growing, the hip sockets rotate down over the balls. Pelvic osteotomies later in the first year aim at the same outcome by cutting and re-setting the bone; JPS is the only one that works by borrowing the puppy's remaining growth, and so it has the earliest deadline: the strongest results at 12 to 16 weeks, smaller ones at 18 to 20, and past 20 weeks results a specialist practice describes as unlikely to be consistent. The candidate is a puppy who looks completely well, whose hips a vet's hands or a PennHIP film have found loose, in the mild-to-moderate range. Puppies with severe laxity mostly went on to arthritis in the Wisconsin two-year series despite the surgery, and the Italian series found the surgery less effective or ineffective in the more severe grades. The whole decision is a calendar, and it closes before any symptom exists.

What JPS actually does#

A puppy's pelvis is two halves joined underneath by a strip of cartilage, the pubic symphysis, which is one of the places the pelvis grows from. JPS destroys the growing cells in that strip, with a needle-tip electrocautery, so the strip fuses early. Nothing is cut through, nothing is implanted and nothing is repositioned on the table. The correction happens afterwards, over the following months, because the top of the pelvis keeps growing while the bottom has stopped, and the two sockets are levered outward and downward over the femoral heads.^[1]

The amount of correction depends on how much growth is left. In the first series, published in 2001 from the University of Wisconsin, five dysplastic puppies were operated at 12, 16, 20, 22 and 24 weeks respectively, and the acetabular response was greater the younger the puppy. The operated dogs finished with a mean acetabular angle 25 degrees greater than before surgery, a mean distraction index of 0.28, below the 0.30 that PennHIP's programme page describes as the point under which hips have very low susceptibility to osteoarthritis,^[20] and normal force-plate gait at 137 weeks. No urinary or bowel complications occurred.^[2] A Clinician's Brief summary of the Wisconsin trials put the expected rotation at about 10 degrees per hip if the puppy is 15 weeks old and 7.5 degrees at 20.^[3]

That mechanism is the whole reason for the deadline. The operation does not fix the hip. It borrows the puppy's remaining growth to reshape it, and every week that passes there is less growth to borrow.

Why the window closes: the evidence by age#

Three studies from two groups, the Wisconsin team behind the first two rows and a French surgeon behind the third, have measured what age does to the result, and they agree on the direction.

The practice guidance is built on those three rows and draws the line in slightly different places. The American College of Veterinary Surgeons says a puppy can be accurately diagnosed with abnormal laxity from 10 weeks and that "puppies less than 18 weeks of age must have it performed."^[6] One specialist practice says the operation "must be performed at a very early age (16 weeks or younger)" and that on dogs older than 20 weeks it "is unlikely to consistently provide desirable results."^[7] The 2017 review in Veterinary Clinics of North America frames it as "more as a preemptive procedure than as a strictly therapeutic one," and says at-risk dogs should be screened by Ortolani testing at 12 weeks.^[8]

Read together: 16 weeks is the target and 18 is the edge. Twenty weeks is a real number, not a marketing one: the randomized study operated half its JPS arm at 20 weeks and found significant improvement there too, only smaller and slower than at 15. What changes after 18 weeks is the odds, and Bernardé's 17.8% is what those odds looked like in the 18-to-22-week arm of a 56-puppy series, judged three to four months out rather than at two years.

Who qualifies: the numbers that decide it#

Age is one axis. The other is how loose the hip is, and the trials are unusually clear that there is a range in which JPS helps and a range in which it does not.

The largest clinical test is Italian, and it is the one to hold in mind because its puppies were client-owned dogs rather than research hounds. Aldo Vezzoni's group assessed puppies at 14 to 22 weeks, selected the ones susceptible to dysplasia, and followed 217 of them to skeletal maturity: 81 had JPS, 76 were managed conservatively, and 60 normal-hipped puppies were followed as a comparison. Graded on the FCI scale at maturity, 43.2% of the JPS group finished A or B, normal or near-normal, against 23.6% of the conservative group; 30.9% of the JPS group still finished D or E, moderate or severe, against 55.3%. The authors' conclusion was that JPS "increased the odds of arresting or limiting the progression" in mild to moderate grades "while it was less effective or ineffective in more severe forms."^[11]

So the honest odds, in the population most like your puppy and in a comparison that was controlled but not randomized, are roughly: JPS raised the share of loose-hipped puppies who reached adulthood with normal or near-normal hips from 23.6% to 43.2%, cut the share who reached it with moderate or severe dysplasia from 55.3% to 30.9%, and did neither for the puppies whose hips were already very loose. That is a real result. It is not a cure, and a surgeon who describes it as one is selling.

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How a puppy with nothing wrong gets found#

A puppy who qualifies for JPS usually has no symptoms. He is typically not limping, not slow to get up and not sore after play, and nothing about him says he ever will be; the Wisconsin series did score hip pain before surgery, but what qualifies a puppy is the laxity, not a complaint. The finding has to be made by someone looking for it, in an appointment that already exists for another reason.

The screening tool inside the window is the Ortolani test, a palpation done under sedation or heavy relaxation in which the vet pushes the hip out of its socket and feels it drop back. The 1998 Wisconsin comparison of seven detection methods in 32 puppies found the Ortolani test unreliable at 6 to 10 weeks, and "significantly predictive at 16-to-18 weeks but had a high incidence of false negatives." Distraction index radiography, the PennHIP method, was the most accurate predictor of arthritis by one year at both ages.^[12] PennHIP's programme states the test "is accurate in dogs as young as 16 weeks of age."^[13] The Wisconsin authors' own practical advice is that a positive Ortolani at 12 to 16 weeks "should alert one to obtain objective laxity determinations," meaning a distraction index.^[4]

Two things follow. A negative Ortolani at the 16-week vaccine visit does not clear a puppy from an at-risk litter, because of those false negatives. And the appointment where this gets caught is the one you are already attending: the ACVS says that between 10 and 18 weeks, "when a puppy is given their shots," the puppy should be examined for pathological laxity by the primary vet or a board-certified surgeon.^[6] The last of those vaccination visits is, for most puppies, the last routine appointment inside the window. If your breed is on the list, that visit is the appointment. Ask for the hips to be checked by hand, and if the answer is anything but a clean negative, ask for the PennHIP films the same week, because the films need 16 weeks and the surgery needs under 18.

A puppy with loose hips at 16 weeks usually runs, lands and sleeps like one with tight hips. If he ever shows a sign, it will arrive after this window has closed, because the window closes at 18 weeks and the trials were still counting arthritis at two years. Everything else on this site is about shortening the delay between a sign and a name. Here there is no sign to wait for. The delay is built into the calendar, and the only way to beat it is to look before there is a reason to.

“Because your dog can't tell you how much pain he or she is in.”

What the trial dogs were, and what that means for yours#

The exacting reader will want to know how much of this rests on research hounds, and the answer is: the mechanism and the age effect rest on them, the population odds rest on pet dogs, and the long-term outcome in pet dogs has not been measured against a control group at all.

The randomized, sham-controlled evidence is 18 female hound puppies with increased hip laxity.^[1] The two-year clinical series is 39 puppies with six controls.^[9] Bernardé's 56 were large and giant breed puppies and Vezzoni's 217 were puppies assessed in a clinical setting rather than a colony, which is why their numbers are the ones to quote, but the Italian study was a controlled clinical comparison, not a blinded randomized trial, and it ended at skeletal maturity.^[11] We found no study that follows JPS dogs and untreated controls into old age and counts who became lame at ten. What you are buying is a well-supported change in the shape of the hip, and a strong inference about what that shape does over a lifetime.

The three things the consult tends to leave out#

Spay or neuter is expected, and the reasons deserve separating. Practice pages state it plainly: one says "surgeons recommend spay or neuter if JPS is performed in order to prevent unethical practices for breeding purposes later in life," because "the hip joints may appear normal radiographically in adulthood, but the dogs' genetic code is, of course, unaltered."^[7] Another says all puppies undergoing the surgery should be sterilised, giving both heritability and an effect on a female's ability to give birth.^[14] The heritability reason is sound and is the one that matters. The pelvic reason is less settled than the clinic pages make it sound: the 2001 series reported mean pelvic dimensions 18% smaller than controls and described the reduction as insignificant,^[2] and a 2013 study of 42 Labradors and 16 Goldens, comparing operated and unoperated adults on standard pelvic films, found "the pelvic canal width was the same in both groups."^[15] The same study bears on the other worry, that JPS is undetectable and lets a dysplastic dog pass as sound: at the group level, the shape of the obturator foramen and two ratios on the pubic rami were significantly smaller after JPS, and general practitioners applied the subjective criteria as reliably as specialists after minimal training. The study did not report how reliably any single dog can be picked out, so the honest reading is that JPS leaves marks on an ordinary hip film that a trained reader can look for, not that it is always caught. Sterilisation is the policy that does not depend on anyone looking.

The screening film is a dated pre-existing finding. If you insure the puppy, the order of operations matters. Spot's sample policy counts a condition as occurring when signs "would have been detectable by a routine physical veterinary exam," observed or not,^[16] and a positive Ortolani at 14 weeks with a distraction index on file is the clearest such record a dog can have. The insurance page sets out the waiting-period arithmetic; the short version is that a policy with a six-month orthopedic waiting period cannot start early enough to cover a 15-week surgery at all, that the two forms we read which cover hips on the ordinary 14-day clock, Spot^[16] and Pets Best's Texas booklet,^[22] could in principle reach it if the puppy was enrolled early enough, and that under either the pre-existing definition then decides. Whatever the answer, the film that justified the surgery will follow the dog into every later hip claim. Enrol before the screening appointment, not after, and ask the insurer in writing how a juvenile screening result will be treated.

We could not find a published price. We looked for a veterinary teaching hospital that lists a JPS fee and did not find one. Consumer cost sites quote ranges with no source, and we do not repeat unsourced numbers. What can be said is structural: a short procedure, no implant, no bone cut, so it should sit well below the price of a pelvic osteotomy or a hip replacement. Get the estimate in writing and check whether it includes the sterilisation, the PennHIP films, and the follow-up radiographs. Our questions for a surgical consult apply here in full, with one addition: ask how many JPS procedures the practice does a year. The Wisconsin group's dose-response study concluded that the electrocautery dose "should be chosen based on measured or estimated physeal size,"^[21] so there is a judgement inside the procedure, and you are entitled to ask how often the practice exercises it.

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What recovery looks like#

This is the hip surgery with the lightest aftercare. The ACVS describes it as "very brief, usually just entailing basic incision care and short-term activity restriction," with leash walks acceptable but strenuous off-leash exercise discouraged until the follow-up examination at 10 months.^[6] One practice specifies two weeks of short, slow leash walks before a return to full activity;^[14] another says "controlled activity for the first few weeks."^[17] The 2001 series reported no urinary or bowel complications;^[2] the 2010 series said fusion "occurred with minor morbidity."^[4]

The thing to understand about that 10-month follow-up is that it is the first time anyone can see whether the surgery worked. The correction is produced by growth, so the films at 10 months are the result, and a puppy who is running normally at three weeks post-op has told you nothing either way. Book the follow-up when you book the surgery.

The intervention that has no deadline#

Whether or not your puppy has JPS, whether he was found at 14 weeks or at 24, one thing in the hip literature has no age window at all, and it is the thing the household controls every day.

In the lifelong paired-feeding study of 48 Labrador Retrievers, one puppy in each pair was fed 25% less than its free-fed littermate from eight weeks of age. There was less subluxation of the femoral heads in the restricted dogs at every age they were filmed, and at two years 7 of 24 restricted dogs were dysplastic by OFA score against 16 of 24 free-fed.^[18] Followed to the end of life, the restricted group's median age at first radiographic hip osteoarthritis was 12 years against 6.^[19]

Two cautions, both of which the scale's own page repeats. The 25% was a gap between two dogs, not a target for yours; the target is a lean body condition set with your vet. And the restricted dogs still had dysplasia in 7 of 24 cases, so feeding is not a substitute for the surgery in a puppy who qualifies. It is the thing that keeps working after the surgery's window has closed, on the dog who had it and on the dog who did not.

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You do not need to buy anything to do this. A kitchen scale with a tare button and gram resolution, which many households already own, is the whole instrument. If you do not have one, the one on the card below costs about what a bag of treats does; we have not used this unit, and any gram scale with a tare does the same job. What the trial tested was the weighed ration, not a brand. The trial began at eight weeks of age, which is to say that for a puppy the scale is on time even when the surgeon is not.

What to do this week#

Under 12 weeks, at-risk breed. Nothing yet except a date. Find the breed page or the hip dysplasia guide for your dog's risk, and write the 12-week Ortolani check into the next vaccine appointment before it exists. Enrol in insurance now if you are going to, before any hip record is made.

12 to 16 weeks. Ask for the hips to be checked by hand at the vaccine visit, sedated if the vet prefers. A positive sign means PennHIP films at 16 weeks and a surgical consult the same week. A negative sign in a high-risk litter is worth the films anyway, because the palpation misses cases. The PennHIP versus OFA page explains what the index means; the German Shepherd threshold sits at 0.28 rather than the general 0.30, per the breed data page.

16 to 18 weeks with a mild-to-moderate index. This is the decision, and it will not wait for a second opinion next month. Get the written estimate, the insurer's written answer, and the surgeon's own JPS numbers, and decide.

Over 18 weeks, or an index at 0.70 or above. The odds have moved against JPS. The trials did operate puppies up to 24 weeks and dogs at 0.70 and above, and one practice page offers it to puppies under five months,^[14] but the large series put success after 18 weeks at 17.8% and the Wisconsin dogs at 0.70 and above mostly progressed anyway. If a surgeon still offers it, ask for the practice's own results at that age and index before paying for it. Otherwise the next question is a double or triple pelvic osteotomy, which the ACVS describes for immature dogs ideally under 8 to 10 months with no radiographic arthritis,^[6] and after that the long management the rest of this site exists for, beginning with the beds built for a dysplastic hip. Start weighing the food tonight regardless.

The one hip operation whose window closes before any symptom can exist has to be done on a puppy who, by everything you can see, has nothing wrong with him. By the time a hip gives you a reason to look, it is already gone. That is the entire argument for looking first.

Sources#

1. Patricelli AJ, Dueland RT, Adams WM, Fialkowski JP, Linn KA, Nordheim EV. "Juvenile pubic symphysiodesis in dysplastic puppies at 15 and 20 weeks of age." Veterinary Surgery. 2002;31(5):435-444. doi:10.1053/jvet.2002.34766 — randomized, sham-controlled; 18 female hound puppies with increased hip laxity; JPS at 15 weeks (n=6), sham at 15 (n=3), JPS at 20 (n=6), sham at 20 (n=3); 25% of JPS dogs vs 83% of controls developed degenerative joint disease; larger and more rapid conformation changes at 15 weeks.
2. Dueland RT, Adams WM, Fialkowski JP, Patricelli AJ, Mathews KG, Nordheim EV. "Effects of pubic symphysiodesis in dysplastic puppies." Veterinary Surgery. 2001;30(3):201-217. doi:10.1053/jvet.2001.23350 — 7 dysplastic Chesapeake Bay Retrievers and 2 beagle-crosses; JPS at 12, 16, 20, 22 and 24 weeks; greater acetabular response at younger ages; final mean DI 0.28; mean pelvic dimensions 18% less than control, described as insignificant; no urinary or bowel complications.
3. Farese J. "Juvenile Pubic Symphysiodesis: Is this Dog a Good Candidate?" Clinician's Brief, last updated December 2006. cliniciansbrief.com — read 17 September 2026: candidates 12 to 20 weeks with mild-to-moderate instability; expected rotation about 10° per hip at 15 weeks and 7.5° at 20.
4. Dueland RT, Adams WM, Patricelli AJ, Linn KA, Crump PM. "Canine hip dysplasia treated by juvenile pubic symphysiodesis. Part I: two year results of computed tomography and distraction index." Veterinary and Comparative Orthopaedics and Traumatology. 2010;23(5):306-317. PubMed 20740258 — 39 dysplastic puppies (6 controls) operated at 12 to 24 weeks; at two years AA +31% (control +3%), DARA −38% (−15%), DI −41% (−20%); benefit in DI 0.40–0.69; most DI ≥0.70 increased in OA grade; 12–16 weeks better than 19–24. The publisher's DOI for this paper redirects to the journal home page rather than the article, so we link PubMed.
5. Bernardé A. "Juvenile pubic symphysiodesis and juvenile pubic symphysiodesis associated with pectineus myotomy: short-term outcome in 56 dysplastic puppies." Veterinary Surgery. 2010;39(2):158-164. doi:10.1111/j.1532-950X.2010.00644.x — large and giant breed puppies selected on positive Ortolani, Norberg angle ≤100° and subluxation index >0.5; success 85% at 12–17 weeks vs 17.8% at 18–22; all control hips dysplastic at follow-up; pectineus myotomy added nothing.
6. American College of Veterinary Surgeons. "Canine Hip Dysplasia." acvs.org — read 17 September 2026: laxity can be accurately diagnosed from 10 weeks; examine between 10 and 18 weeks at vaccination visits; "puppies less than 18 weeks of age must have it performed"; aftercare "very brief"; leash walks acceptable, strenuous off-leash exercise discouraged until the 10-month follow-up; DPO/TPO for immature dogs ideally under 8–10 months.
7. Global Vet Specialists. "Juvenile Pubic Symphysiodesis (JPS)." globalvetspecialists.org — read 17 September 2026: "16 weeks or younger"; older than 20 weeks "unlikely to consistently provide desirable results"; spay or neuter recommended to prevent breeding; hips may look normal radiographically while the genetic code is unaltered.
8. Linn KA. "Juvenile Pubic Symphysiodesis." Veterinary Clinics of North America: Small Animal Practice. 2017;47(4):851-863. doi:10.1016/j.cvsm.2017.03.004 — review; effective only at a young age and in mildly to moderately lax hips; "best viewed more as a preemptive procedure than as a strictly therapeutic one"; screen at-risk dogs by Ortolani at 12 weeks.
9. Dueland RT, Patricelli AJ, Adams WM, Linn KA, Crump PM. "Canine hip dysplasia treated by juvenile pubic symphysiodesis. Part II: two year clinical results." Veterinary and Comparative Orthopaedics and Traumatology. 2010;23(5):318-325. PubMed 20740257 — same 39 puppies, positive Ortolani or DI ≥0.40; mean OA level +11% in JPS dogs (not significant) vs +55% in controls; 74% reversal of positive Ortolani; hip pain +33%, not significant; DI ≥0.70 progressive. Linked via PubMed for the reason given at source 4.
10. Manley PA, Adams WM, Danielson KC, Dueland RT, Linn KA. "Long-term outcome of juvenile pubic symphysiodesis and triple pelvic osteotomy in dogs with hip dysplasia." Journal of the American Veterinary Medical Association. 2007;230(2):206-210. doi:10.2460/javma.230.2.206 — prospective; 18 dogs with DI ≥0.5; JPS at 4–5.5 months vs TPO at 5–12 months; no significant differences at two years; "neither procedure eliminates the hip joint laxity characteristic of hip dysplasia or the progression of degenerative changes."
11. Vezzoni A, Dravelli G, Vezzoni L, De Lorenzi M, Corbari A, Cirla A, Nassuato C, Tranquillo V. "Comparison of conservative management and juvenile pubic symphysiodesis in the early treatment of canine hip dysplasia." Veterinary and Comparative Orthopaedics and Traumatology. 2008;21(3):267-279. doi:10.1055/s-0037-1617372 — 217 puppies assessed at 14–22 weeks completed the study, 81 JPS, 76 conservative, plus 60 normal controls; FCI grade at maturity: A/B 43.2% vs 23.6%, C 25.9% vs 21.1%, D/E 30.9% vs 55.3%.
12. Adams WM, Dueland RT, Meinen J, O'Brien RT, Giuliano E, Nordheim EV. "Early detection of canine hip dysplasia: comparison of two palpation and five radiographic methods." Journal of the American Animal Hospital Association. 1998;34(4):339-347. doi:10.5326/15473317-34-4-339 — 32 puppies of four breeds; Ortolani not reliable at 6–10 weeks, significantly predictive at 16–18 weeks with a high false-negative rate; distraction index the most accurate predictor of DJD by one year.
13. Antech Diagnostics. "PennHIP." antechdiagnostics.com — read 17 September 2026: "The test is accurate in dogs as young as 16 weeks of age."
14. Animal Clinic of Billings. "Juvenile Pubic Symphysiodesis (JPS) Surgery on Dogs." animalclinicofbillings.com — read 17 September 2026: puppies under five months; all patients spayed or neutered, citing heritability and an effect on a female's ability to give birth; two weeks of short, slow leash walks.
15. Boiocchi S, Vezzoni L, Vezzoni A, Bronzo V, Rossi F. "Radiographic changes of the pelvis in Labrador and Golden Retrievers after juvenile pubic symphysiodesis: objective and subjective evaluation." Veterinary and Comparative Orthopaedics and Traumatology. 2013;26(3):218-225. doi:10.3415/vcot-12-06-0074 — 42 Labradors and 16 Goldens; obturator foramen shape and pubic rami ratios significantly smaller after JPS; pelvic canal width the same in both groups; general practitioners read the criteria as reliably as specialists.
16. Spot Pet Insurance sample policy, form PET-P-20000-1024, underwritten by Independence American Insurance Company. spotpet.com — read 27 August 2026.
17. Veterinary Referral & Orthopedic Center. "Juvenile pubic symphysiodesis (JPS)." vroc.vet — read 17 September 2026: most effective under 20 weeks; mild to moderate laxity; "controlled activity for the first few weeks."
18. Kealy RD, Olsson SE, Monti KL, Lawler DF, Biery DN, Helms RW, Lust G, Smith GK. "Effects of limited food consumption on the incidence of hip dysplasia in growing dogs." Journal of the American Veterinary Medical Association. 1992;201(6):857-863. doi:10.2460/javma.1992.201.06.857 — 48 Labrador Retrievers from 8 weeks; 25% restriction; less femoral head subluxation at every age filmed; OFA dysplasia at two years in 7 of 24 restricted vs 16 of 24 free-fed.
19. Smith GK, Paster ER, Powers MY, Lawler DF, Biery DN, Shofer FS, McKelvie PJ, Kealy RD. "Lifelong diet restriction and radiographic evidence of osteoarthritis of the hip joint in dogs." Journal of the American Veterinary Medical Association. 2006;229(5):690-693. doi:10.2460/javma.229.5.690 — same cohort to end of life; median age at first radiographic hip OA 12 years restricted vs 6 years free-fed.
20. Antech Diagnostics. "Measuring Hip Joint Laxity with PennHIP." antechdiagnostics.com — read 17 September 2026: a distraction index below 0.30 is described as the point under which hips have very low susceptibility to osteoarthritis.
21. Patricelli AJ, Dueland RT, Lu Y, Fialkowski J, Mathews KG. "Canine pubic symphysiodesis: investigation of electrocautery dose response by histologic examination and temperature measurement." Veterinary Surgery. 2001;30(3):261-268. doi:10.1053/jvet.2001.23352 — 12 puppies at 15 to 17 weeks; thermal necrosis zone predictable at 40 W; "doses should be chosen based on measured or estimated physeal size."
22. Pets Best Accident & Illness policy booklet, Texas, form APIC-PBI0001-ILL (12/2015), underwritten by American Pet Insurance Company. petsbest.com — read 27 August 2026: hips covered as an ordinary illness on the 14-day waiting period; the six-month wait applies to knees only.

This article is educational and does not replace veterinary advice. Whether a puppy is a candidate for juvenile pubic symphysiodesis, and when, is a decision for your own vet and a board-certified surgeon with your dog's palpation findings and films in front of them. We have no veterinary reviewer on this page yet and say so in the badge above.