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Husi et al: Comparative kinetic and kinematic evaluation of TPLO and TPLO combined with extra-articular lateral augmentation: A biomechanical study
Veterinary Surgery 5, 2023

🔍 Key Findings

  • TPLO alone failed to neutralize rotational instability under tibial pivot compression (TPT), despite a negative TCT.
  • TPLO combined with lateral augmentation (TPLO-IB) restored both craniocaudal and rotational stability to near-intact levels.
  • Cranial tibial translation was 6× greater after TPLO vs intact stifles when tested with TPT (p < .001).
  • No significant difference in cranial tibial translation or internal rotation between intact stifles and TPLO-IB group during TCT, eTPT, or iTPT.
  • TPLO-IB did not overconstrain the stifle, avoiding excessive external rotation.
  • External tibial rotation (eTPT) was more sensitive than TCT in detecting persistent instability after TPLO.
  • Excellent intraobserver reliability for both eTPT and iTPT (ICC > 0.9).
  • Study supports intraoperative use of TPT to identify cases needing additional rotational stabilization.

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← Articles

Husi et al: Comparative kinetic and kinematic evaluation of TPLO and TPLO combined with extra-articular lateral augmentation: A biomechanical study
Veterinary Surgery 5, 2023

🔍 Key Findings

  • TPLO alone failed to neutralize rotational instability under tibial pivot compression (TPT), despite a negative TCT.
  • TPLO combined with lateral augmentation (TPLO-IB) restored both craniocaudal and rotational stability to near-intact levels.
  • Cranial tibial translation was 6× greater after TPLO vs intact stifles when tested with TPT (p < .001).
  • No significant difference in cranial tibial translation or internal rotation between intact stifles and TPLO-IB group during TCT, eTPT, or iTPT.
  • TPLO-IB did not overconstrain the stifle, avoiding excessive external rotation.
  • External tibial rotation (eTPT) was more sensitive than TCT in detecting persistent instability after TPLO.
  • Excellent intraobserver reliability for both eTPT and iTPT (ICC > 0.9).
  • Study supports intraoperative use of TPT to identify cases needing additional rotational stabilization.

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Multiple Choice Questions on this study

In Husi 2023 et al., on TPLO vs TPLO-IB biomechanics, how did the TPLO-IB construct affect rotational stability compared to TPLO alone?

A. Overconstrained the stifle
B. Restored rotational motion to pre-CCLD levels
C. Induced external tibial rotation
D. Worsened rotational laxity
E. Did not change internal rotation

Answer: Restored rotational motion to pre-CCLD levels

Explanation: TPLO-IB reduced internal tibial rotation to levels similar to intact stifles without inducing external overconstraint.
In Husi 2023 et al., on TPLO vs TPLO-IB biomechanics, what was the intraobserver reliability for the eTPT and iTPT tests after TPLO and TPLO-IB?

A. Fair to good
B. Poor
C. Excellent
D. Low for eTPT only
E. Low for iTPT only

Answer: Excellent

Explanation: Intraobserver reliability was excellent with ICCs of 0.93 (eTPT) and 0.91 (iTPT).
In Husi 2023 et al., on TPLO vs TPLO-IB biomechanics, what was the key limitation of the tibial compression test (TCT) after TPLO?

A. It failed to detect flexion instability
B. It falsely indicated instability in all cases
C. It required muscle loading for accuracy
D. It did not detect residual rotational instability
E. It overestimated joint stiffness

Answer: It did not detect residual rotational instability

Explanation: The study showed that although TCT appeared negative post-TPLO, rotational instability remained, revealed by TPT.
In Husi 2023 et al., on TPLO vs TPLO-IB biomechanics, which test revealed significantly greater cranial tibial translation after TPLO compared to intact stifles?

A. TCT only
B. eTPT only
C. iTPT only
D. Both eTPT and iTPT
E. All three tests

Answer: Both eTPT and iTPT

Explanation: Cranial tibial translation was ~6× higher in TPLO stifles vs intact during both eTPT and iTPT, but not during TCT.
In Husi 2023 et al., on TPLO vs TPLO-IB biomechanics, what was concluded about the intraoperative utility of the tibial pivot compression test (TPT)?

A. It has poor repeatability
B. It is only useful in live dogs
C. It helps identify residual instability and need for augmentation
D. It is not validated in TPLO
E. It's only applicable with fluoroscopy

Answer: It helps identify residual instability and need for augmentation

Explanation: TPT (both eTPT and iTPT) showed good reliability and revealed instability that TCT missed, supporting its intraoperative use.

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