Your dog had the surgery and is still lame. The first thing worth knowing is that most complications after TPLO are minor, and genuine failure is uncommon. The second is that when it does happen, the right fix depends entirely on which thing went wrong.
This is the distinction that decides everything else, and it is not subtle once you know what to look for. Most dogs limp for weeks and improve unevenly. That is a slow recovery, and it needs patience and rehab rather than another operation.
Failure is different in kind, not degree. The bone is not healing, the implant is compromised, or new pain appears after a period of genuine improvement. If you are unsure which one you are in, that is the question worth answering before anyone schedules a second surgery.
| Week | What you should be seeing |
|---|---|
| Weeks 1 to 2 | Soreness easing, toe-touching weight bearing, mild swelling settling |
| Weeks 3 to 4 | Consistent partial weight bearing, no heat or discharge at the incision |
| Weeks 5 to 8 | Walking comfortably on the lead, muscle rebuilding |
| Weeks 8 to 12 | Near-normal gait under controlled activity |
If you are earlier than this and still deciding on the surgery itself, the TPLO decision guide covers the procedure, the alternatives and what to ask before you sign.
Worth putting a real number on, because the internet is not a representative sample of outcomes. A 2022 systematic review pooled 2,547 TPLO surgeries. The overall complication rate was about 20%, but the split is the part that matters: 17.9% minor against 3.3% major.
Size changed the picture more than anything else. Major complications ran at 0% in small dogs, 3.5% in medium dogs, and 10.2% in large ones. TPLO is recommended most often for large dogs, which is also where the risk sits highest.
The review itself cautions that studies define major and minor inconsistently. Treat these as an order of magnitude, not a prediction for your dog.
Most dogs improve steadily for the first fortnight and then plateau. Failure tends to announce itself as the opposite: progress that stops, or reverses.
A dog walking better at week two than at week five is the single clearest warning sign. Slow is normal. Backwards is not.
Persistent warmth over the implant site points to inflammation or infection rather than ordinary healing.
Often a meniscal problem, sometimes loose hardware. Either way it is a finding, not a quirk.
Not putting the leg down at any point after the first week is outside normal recovery.
Signs of infection. These need same-day attention, not a wait-and-see.
Write down what you see and when, then call your surgeon. Dated notes are worth more than a recollection, and they become part of what any reviewer works from later.
The same review names the four most common major complications across both TPLO and TTA: meniscal lesions, surgical site infections, tibial tuberosity fractures, and implant loosening.
The classic reason a dog does well at first and then re-limps. A tear that was missed can worsen, or the altered mechanics of the knee can produce a new one months later. It often shows up as a sudden click, a stiffer leg, and lameness returning after a good stretch.
Screws can loosen or break where the osteotomy has not closed, and the bone can heal slowly or not at all. These produce a similar picture to each other, a dog that never improved or improved then regressed, but the repair for each is different. That is precisely why the failure mode has to be identified before anyone picks a procedure.
Uncommon but serious. Swelling, discharge or persistent pain weeks after surgery. Infection around hardware can compromise the bone holding it, so it needs cultures and a plan rather than a course of antibiotics and hope.
ACVS is explicit that activity has to be restricted for several weeks after cruciate surgery precisely to avoid complications with the implants or with healing. If confinement slipped, that is worth saying out loud to your surgeon rather than hiding.
It starts with repeat radiographs of the stifle, ideally alongside comparison views of the other leg, looking for implant loosening, a broken screw, an osteotomy that has not healed, or a plate that has moved since the original surgery.
Where plain films are inconclusive, CT gives a clearer view of bone healing and implant position. Infection is ruled out separately, usually with a joint tap, because an infected implant can look like a purely mechanical failure. Persistent lameness with clean imaging often points back to the meniscus, which may only be confirmed by looking inside the joint.
Usually not, and the evidence does not support it as a reflex. Comparing the two techniques in medium-sized dogs, the 2022 review found complication rates did not differ: a mean of 20.0% for TPLO against 26.5% for TTA, with weighted means of 22.3% and 22.0%. Both were judged successful management options.
So the revision plan follows the failure mode, not the original technique. An implant removal, a revision osteotomy and a joint fusion solve three different problems, and choosing between them without knowing which problem you have is how owners end up paying for two surgeries.
These are illustrative tiers rather than published figures. Get a written, itemised estimate covering anesthesia, implants, hospitalisation, follow-up imaging and what happens if there is a complication.
| Procedure | Typical range | When it applies |
|---|---|---|
| Meniscal repair or meniscectomy | $800 to $1,500 | If the implant is stable and the meniscus is the problem |
| Implant removal | $1,000 to $2,500 | Once the osteotomy has healed and the hardware is irritating tissue |
| Revision TPLO | $4,000 to $8,000 | Repeating or correcting the osteotomy, with new implants |
| Salvage, such as arthrodesis | $5,000 to $10,000 and up | Fusing the joint when reconstruction is no longer possible |
Before the revision, not after. Three things should prompt one: the explanation you were given does not sit right, recovery has stalled well past twelve weeks, or a second surgery is being recommended without new imaging to justify it.
Send everything. Pre-operative radiographs, post-operative films from every recheck, lab results, the original surgical report, and your own dated notes. A reviewer without the original imaging is guessing, and ask your clinic for the full image files rather than only the written radiology report.
A written opinion from a board-certified specialist starts at $179 here, against roughly $250 to $500 for an in-person specialist consultation. Against a revision in the four to eight thousand range, knowing which failure mode you are dealing with is the cheapest part of the decision.
Get a specialist to review the imagingA young, large, otherwise healthy dog usually has the most to gain from revision. An older dog with arthritis in the other knee or the hips may do as well on managed exercise, pain control and weight management, and that is a real plan rather than giving up.
Quality of life is the tiebreaker. Track limping, restlessness and willingness to use the leg across two weeks of structured rest, then decide with that in front of you. If the pain stays controlled and the leg is being used, conservative management is a legitimate outcome. If it is not, you will know, and you will know it with evidence.
If you want background on the underlying condition rather than this surgery, our guide to canine CCL tears covers it.
Most dogs are bearing weight comfortably within 8 to 12 weeks, and uneven progress inside that window is normal. Treat it as possible failure if lameness persists well past 12 weeks, if your dog improved early and then regressed, or if new pain appears. Those patterns call for fresh imaging rather than more waiting.
A 2022 systematic review pooling 2,547 TPLO surgeries found an overall complication rate of about 20%, but most of that was minor: 17.9% minor against 3.3% major. Size changed the picture considerably, with major complications at 0% in small dogs, 3.5% in medium dogs and 10.2% in large ones. The review also notes that studies define major and minor inconsistently, so treat these as an order of magnitude rather than a precise risk for your dog.
The same review found the most common major complications in both TPLO and TTA were meniscal lesions, surgical site infections, tibial tuberosity fractures and implant loosening. A meniscal tear is the classic reason a dog does well at first and then re-limps, because the tear can develop or worsen after the knee's mechanics change.
Rarely, and the evidence does not support it as a default. Comparing TPLO and TTA in medium dogs, the 2022 review found complication rates did not differ between the techniques. The revision plan depends on why this TPLO failed, not on the original choice of procedure. An implant removal, a revision osteotomy and an arthrodesis solve completely different problems.
Sometimes. An older dog, or one with arthritis in the other knee or hips, may do well on managed exercise, pain control and weight management. Track limping, restlessness and willingness to use the leg across two weeks of structured rest before deciding. If pain stays controlled and the leg is being used, conservative management is a legitimate outcome rather than a cop-out.
The complete set: pre-operative radiographs, post-operative films from every recheck, lab results, the original surgical report, and your own notes on the recovery. A reviewer without the original imaging is guessing. Ask your clinic for the full image files rather than only the written radiology report.
This guide references:
Last updated: .
This guide is for general educational purposes and is not a substitute for in-person veterinary examination. Always consult your primary licensed veterinarian about your pet.