Cruciate ligament disease in dogs: TPLO vs modified TTA (TTA Rapid) — POSSIBLE

In dogs with cranial cruciate ligament disease, do TPLO and modified TTA differ in functional and radiographic outcomes?

Shelf #190 · gate-verified and approved by the developer

POSSIBLE: The one randomised head-to-head trial found an early recovery edge for the modified TTA and no difference by 6 months, while the longer-term non-randomised evidence leans the other way — so neither technique is shown superior overall. Livet 2019 prospectively randomised 26 dogs with cranial cruciate ligament rupture to TPLO (n = 13) or TTA Rapid (n = 13): surgery was significantly shorter with TTA Rapid (p < 0.0001), lameness scores were significantly higher (worse) in the TPLO group on days 1–3, the 1-month gait symmetry index favoured TTA Rapid (p < 0.01), no gait parameters differed at 6 months, complications did not differ significantly, and owner satisfaction was complete in 13/13 TPLO vs 11/13 TTA Rapid owners. The non-randomised short-term comparison (Ferreira 2016, allocation by tibial plateau angle, not random) likewise found no significant between-group differences to 90 days. At 3 years or more, however, the large retrospective cohort (Moore 2020, 118 dogs, 166 stifles) found osteoarthritis progressed more after TTA (P = .003) and several owner-reported pain and mobility scores favoured TPLO — a pattern the randomised trial, with 26 dogs and 6 months of follow-up, was far too small and short to test. Small randomised numbers plus confounded long-term data cap this shelf at POSSIBLE. Drafted Nov 10, 2026 (VetMed build, topic #190); all figures from abstracts fetched and verified at drafting.

Livet 2019: TTA Rapid recovered faster in the first days and at 1 month, but no gait parameter differed at 6 months; surgery was shorter with TTA Rapid

Randomized clinical study (record's own title wording; prospective randomisation stated in the abstract)

Who: Dogs: 26 dogs with cranial cruciate ligament rupture in a clinical setting, prospectively randomized into a TPLO group (n = 13) and a TTA Rapid group (n = 13); lameness scoring, gait analysis and radiographical examination were performed before surgery, at 3 days after surgery, and at 1, 3 and 6 months postoperatively, and owners subjectively rated their satisfaction.

Result: The duration of surgery was significantly shorter for the TTA Rapid procedure (p < 0.0001). There was no significant difference in the occurrence of complications between groups. Lameness scores were significantly higher during the first 3 days after surgery for the TPLO group (p = 0.01 at day 1, p = 0.01 at day 2 and p = 0.003 at day 3). One month after surgery, the symmetry index between healthy and affected limbs for the relative stance time during the gait cycle was significantly higher for the TTA Rapid group (p < 0.01). No gait parameters were significantly different between the two groups 6 months after surgery. All of the owners of dogs in the TPLO group were completely satisfied, whereas only 11/13 owners of dogs in the TTA Rapid group were completely satisfied. The authors concluded that both procedures were associated with high long-term success rates, that immediate postoperative recovery seemed faster with TTA Rapid, and that thereafter there was no difference.

Watch out: Thirteen dogs per group: this trial can detect large early differences but cannot exclude meaningful differences in complications, radiographic osteoarthritis progression or late function, and 6 months is short for an osteoarthritis question. The record establishes prospective randomisation (and indexes Random Allocation) but does not state that lameness, gait or radiographic assessors were blinded to procedure — blinding is not claimed, and radiographs in any case show which osteotomy was performed. TTA Rapid is the modified TTA technique named in this shelf's question; results should not be assumed identical for every other TTA variant.

Livet V, Baldinger A, Viguier É, Taroni M, Harel M, Carozzo C, Cachon T. Comparison of Outcomes Associated with Tibial Plateau Levelling Osteotomy and a Modified Technique for Tibial Tuberosity Advancement for the Treatment of Cranial Cruciate Ligament Disease in Dogs: A Randomized Clinical Study. Vet Comp Orthop Traumatol. 2019;32(4):314-323. PMID: 30943550. Registry ID: none in the record. MeSH: Animals · Anterior Cruciate Ligament/surgery · Anterior Cruciate Ligament Injuries/surgery,veterinary · Dog Diseases/surgery · Dogs · Female · Follow-Up Studies · Gait · Male · Osteotomy/veterinary · Postoperative Complications/veterinary · Prospective Studies · Random Allocation · Rupture/surgery,veterinary · Treatment Outcome

Ferreira 2016: limb function improved after both TTA and TPLO with no significant differences to 90 days — but dogs were allocated by anatomy, not at random

Comparative study with allocation by tibial plateau angle (record's publication type and abstract wording; NOT randomised)

Who: Dogs: 27 adult dogs weighing over 20 kg presented with unilateral cranial cruciate ligament disease in a clinical setting, treated by TTA (12 dogs) or TPLO (15 dogs); patient allocation to either group was based on tibial plateau angle (TPA), according to clinical guidelines (indication for TTA was a TPA up to 25°, and indication for TPLO was any TPA). Pressure platform analysis was performed prior to surgery and at 14, 30, 60 and 90 days postoperatively, alongside subjective parameters.

Result: Limb function significantly improved following TTA and TPLO, with no significant differences between groups. The authors considered the TTA and TPLO surgical procedures to be equally effective in promoting weight bearing capacity recovery in dogs affected with unilateral CCLD under the conditions of this trial.

Watch out: Not a randomised trial and not claimed as one: because allocation followed tibial plateau angle, the two groups differed by anatomy by design, which confounds any between-group comparison — dogs with steeper plateau angles were channelled toward TPLO. The abstract reports the no-difference conclusion without between-group figures, and follow-up ends at 90 days, so this card supports only the short-term functional half of the shelf's question. Blinding of assessors is not stated in the record and is not claimed.

Ferreira MP, Ferrigno CR, de Souza AN, Caquias DF, de Figueiredo AV. Short-term comparison of tibial tuberosity advancement and tibial plateau levelling osteotomy in dogs with cranial cruciate ligament disease using kinetic analysis. Vet Comp Orthop Traumatol. 2016;29(3):209-13. PMID: 27124087. Registry ID: none in the record. MeSH: Animals · Anterior Cruciate Ligament/surgery · Dog Diseases/surgery · Dogs · Kinetics · Orthopedic Procedures/methods,veterinary · Osteotomy/veterinary · Stifle/surgery · Tibia/surgery · Weight-Bearing

Moore 2020: at 3+ years, osteoarthritis progressed more after TTA (P = .003) and owner-reported pain and mobility scores favoured TPLO

Retrospective clinical cohort study (record's own wording)

Who: Dogs: client-owned dogs with cranial cruciate ligament rupture and at least 3 years of follow-up (118 dogs, 166 stifles) in a clinical setting; records from June 2012 to May 2015 were reviewed and follow-up examination and radiography performed, with outcomes including a radiographic osteoarthritis score (preoperative, 8 weeks postoperative, and at least 3 years postoperative), the Canine Brief Pain Inventory, and the Canine Orthopedic Index. Ninety-four dogs treated with TPLO (133 stifles) and 24 dogs treated with TTA (33 stifles) met the inclusion criteria; all dogs underwent meniscal release or partial medial meniscectomy.

Result: Osteoarthritis score progressed more after TTA (P = .003) and in dogs with bilateral surgery (P = .022). Long-term outcomes that were better after TPLO compared with TTA included average pain in the last 7 days (P = .007), interference with walking (P = .010), morning stiffness (P = .004), jumping (P = .003) and climbing (P = .040), limping during mild activities (P = .001), and overall quality of life (P = .045). The authors concluded that osteoarthritis progressed more after TTA and in dogs with bilateral stifle surgery, that dogs treated with TPLO subjectively seemed to have less pain and fewer mobility issues, and that TPLO provides a better long-term radiographic and functional outcome than TTA.

Watch out: Retrospective and heavily unbalanced (94 TPLO vs 24 TTA dogs), with procedure chosen in practice rather than at random — surgeon preference, case anatomy and era can all confound the comparison, and owner-reported scores were collected knowing which operation the dog had. This card is the only long-term radiographic evidence on the shelf, which is why it is carded, but its design cannot overturn the randomised trial; the honest reading is a long-term signal favouring TPLO that a larger, longer randomised trial has yet to test. The TTA technique in this cohort is not specified as TTA Rapid in the record.

Moore EV, Weeren R, Paek M. Extended long-term radiographic and functional comparison of tibial plateau leveling osteotomy vs tibial tuberosity advancement for cranial cruciate ligament rupture in the dog. Vet Surg. 2020;49(1):146-154. PMID: 31287180. Registry ID: none in the record. MeSH: Animals · Anterior Cruciate Ligament Injuries/surgery,veterinary · Cohort Studies · Dog Diseases/surgery · Dogs · Female · Male · Osteotomy/methods,veterinary · Patellar Ligament/surgery · Retrospective Studies · Rupture/surgery,veterinary · Stifle/surgery · Tibia/surgery

Synthesis: a faster first month with TTA Rapid, a dead heat at 6 months, and an untested long-term radiographic signal favouring TPLO

Synthesis

Who: Synthesis of the cards above: Livet 2019 (26 dogs, randomised, TPLO vs TTA Rapid, 6 months), Ferreira 2016 (27 dogs over 20 kg, allocation by tibial plateau angle, 90 days) and Moore 2020 (118 dogs, 166 stifles, retrospective, at least 3 years).

Result: Across designs: (1) early function — the randomised trial favours TTA Rapid (less lameness on days 1–3, better gait symmetry at 1 month) and surgery was significantly shorter; (2) medium-term function — no significant gait differences at 6 months in the randomised trial and none to 90 days in the angle-allocated comparison; (3) complications — no significant difference in the randomised trial; (4) long-term radiography and owner scores — only the retrospective cohort reaches beyond a year, and it favours TPLO (osteoarthritis progression P = .003), but its non-random, unbalanced design makes that a hypothesis, not a verdict. Owner satisfaction was high with both techniques in every carded study.

Watch out: No carded study is both randomised and long: the randomised evidence stops at 6 months in 26 dogs, and the long-term evidence is retrospective. Meniscal injury, implant and infection outcomes beyond the randomised trial's complication count are outside these records, as are other TTA variants and other levelling/advancement procedures.

Synthesis of Livet V et al. PMID: 30943550; Ferreira MP et al. PMID: 27124087; Moore EV et al. PMID: 31287180. Registry IDs as on the individual cards.

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