Quiz Question
In Marturello 2023 et al., on 3D-printed humeral models, which desktop printer and region combination yielded **the most accurate measurement**?
🔍 Key Findings
- 3D-printed models using desktop printers (FDM, LFS) showed submillimetric accuracy, comparable to or better than industrial-grade PJP printers.
- Bone size had a greater effect on print accuracy than printer type, especially in proximal humerus regions.
- The humeral condyle region showed the greatest model accuracy, with mean differences under 0.5 mm, regardless of printer.
- Models tended to be slightly smaller than cadaveric bones, potentially due to systematic underestimation during printing.
- FDM printer provided the highest accuracy at the humeral condyle in medium-sized bones (+0.09 mm).
- LFS printer produced prints faster and more reliably than FDM, although both had comparable dimensional accuracy.
- Statistically significant differences existed, but all were submillimetric and unlikely to impact surgical outcomes.
- Desktop printers are suitable for surgical planning, including plate pre-contouring and patient-specific instrumentation.
Veterinary Surgery
1
2023
Accuracy of anatomic 3‐dimensionally printed canine humeral models
2023-1-VS-marturello-4
In Lu 2025 et al., on SOP constructs, what mechanical outcome was observed across **all test constructs**, regardless of tee presence?
🔍 Key Findings
- Bending tees significantly increased mediolateral bending stiffness, but not craniocaudal stiffness, in plate-bone constructs.
- Mean mediolateral stiffness was 43.2 N/mm with tees vs. 41.1 N/mm without (p = 0.0042), though the absolute difference was small.
- No significant differences were found in craniocaudal bending stiffness between constructs with or without tees (p = 0.89).
- Plastic deformation occurred in all constructs; no screw pull-out or implant breakage was observed.
- SOP nodes may resist compressive but not tensile deformation, suggesting variable mechanical contributions depending on loading direction.
- Craniocaudal bending had greater stiffness than mediolateral due to higher area moment of inertia along the node diameter.
- Clinical relevance of added stiffness from tees remains unclear, warranting further in vivo and cyclic testing.
- This was the first study to directly test SOP constructs with/without tees over a fracture gap in multiple planes.
Veterinary and Comparative Orthopaedics and Traumatology
2
2025
Comparison of Bending Stiffness between String of Pearls Plate-Bone Substitute Constructs with and without Bending Tees in a Fracture Gap Model
2025-2-VCOT-lu-3
In Welsh 2025 et al., on orthogonal plating, what was the failure load for the OP2.0 construct?
🔍 Key Findings
- Compared unilateral plating (UP) vs orthogonal plating (OP) with 2.0, 2.4, and 3.0 mm plates (OP2.0, OP2.4, OP3.0).
- Model: acetal homopolymer (Delrin) rod with 29 mm fixed fracture gap, loaded axially (4–196 N, 90,000 cycles).
- OP constructs had 2.5–4.1x higher strength and 3.0–4.2x higher stiffness than UP constructs (p < .0002).
- UP had 3.5–4.1x higher gap strain than OP groups (p < .0075).
- All OP groups exceeded 1000 N max load before failure (vs 424 N for UP).
- Greater implant size in OP groups further increased performance.
- All constructs survived fatigue loading; 3.5 mm plates showed deformation, especially UP; OP plates remained intact.
Veterinary Surgery
4
2025
Biomechanical analysis of orthogonal and unilateral locking plate constructs in a fracture gap model
2025-4-VS-welsh-3
In Trefny 2025 et al., on plate length and stiffness, which plate length significantly increased construct stiffness over all shorter options?
🔍 Key Findings
- 12-hole LCPs (80% plate–bone ratio) showed significantly higher construct stiffness than 6-, 8-, or 10-hole plates in both compression and tension bending.
- Strain on the plate was significantly lower in 12-hole vs 6-hole plates at all regions of interest (ROIs), especially around the fracture gap.
- No incremental increases in stiffness or decreases in strain were observed between 6-, 8-, and 10-hole plates—only when comparing to 12-hole plates.
- Bone model strain adjacent to the plate end was significantly lower for 10- and 12-hole plates vs 6-hole plates under both loading conditions.
- The threshold effect suggests biomechanical benefits only emerge beyond a plate–bone ratio of ~80%.
- Working length increased from 9.4 mm (6-hole) to 13 mm (others), potentially influencing strain/stiffness differences.
- Four-point bending was used, as it replicates the most biomechanically relevant force on plated long bones.
- Clinical implication: Longer plates may reduce plate strain and peri-implant bone strain, potentially lowering risk of fatigue failure or stress risers.
Veterinary and Comparative Orthopaedics and Traumatology
2
2025
Effect of Plate Length on Construct Stiffness and Strain in a Synthetic Short-Fragment Fracture Gap Model Stabilized with a 3.5-mm Locking Compression Plate
2025-2-VCOT-trefny-1
In Fidelis 2025 et al., on suture eyelet geometry, which anchor showed the **least reduction in suture strength** compared to a smooth eyebolt reference?
🔍 Key Findings
- Raised eyelets caused more suture mid-section failures than embedded eyelets, suggesting wear or cutting against the anchor.
- No significant effect of cyclic loading on failure load (Fmax) was found for any anchor group.
- Anika anchor showed the least reduction in suture strength relative to the reference (eyebolt screw), indicating a favorable design.
- All sutures failed via suture breakage, not anchor pullout, indicating suture fatigue was the primary failure mode.
- Sutures in raised eyelets more often failed at the mid-section, while those in embedded eyelets failed at the knot.
- IMEX and Jorvet anchors showed significantly reduced Fmax compared to eyebolt screws.
- Loading direction and anchor design likely affect wear and ultimate failure, particularly in dynamic in vivo conditions.
- Future designs should aim for embedded, smooth eyelets that can accommodate larger suture sizes without increasing wear.
Veterinary Surgery
6
2025
Effect of suture anchor type, eyelet configuration, and loading condition on suture failure: An in vitro study
2025-6-VS-fidelis-1
In Paulick 2022 et al., on feline ilial plating, what factor most contributed to the **poor performance** of the ALPS-5 system despite it being a locking plate?
🔍 Key Findings
- Locking plates (except ALPS-5) withstood significantly more cycles before failure than nonlocking DCP constructs.
- ALPS-6.5, LCP, and FIXIN plates endured higher loads and resisted displacement better than DCP and ALPS-5.
- ALPS-5 plates showed lower bending stiffness than all other constructs (P < .05).
- DCP constructs failed due to screw loosening, seen in all specimens.
- Locking constructs failed by bone slicing, affecting 100% of specimens.
- Catastrophic implant failure (fracture or plastic deformation) occurred only in ALPS-5 group.
- Plate size and screw-plate interface both influence resistance to cyclic loading in feline ilial fracture repair.
- Locking plates are preferable for reducing screw pullout, but plate strength (e.g., cross-section) must match loading forces.
Veterinary Surgery
1
2022
Ex vivo comparison of lateral plate repairs of experimental oblique ilial fractures in cats
2022-1-VS-paulick-5
In Townsend 2024 et al., on 3D osteotomy accuracy, which osteotomy type showed the most significant time reduction using PSG versus freehand?
🔍 Key Findings:
- Design: Ex vivo study with 24 paired limbs from normal beagle dogs.
- Osteotomy types (3 groups):
- 30° uniplanar frontal wedge
- Oblique (30° frontal, 15° sagittal)
- Single oblique (30° frontal, 15° sagittal, 30° external rotation)
- Comparison: 3D PSG vs Freehand (FH)
- Main Outcomes:
- PSG accuracy: Mean angular deviation = 2.8° vs 6.4° in FH (p < .001).
- 84% of PSG osteotomies were within 5° of target vs 50% of FH.
- Significant improvements with PSG in:
- Group 1 (uniplanar frontal) proximal and distal frontal planes (p < .001, .006)
- Group 3 (SOO) frontal and sagittal planes (p = .002, .043)
- Time: PSG faster in complex SOO group (84s vs 162s, p < .001); no difference in others.
- No difference in osteotomy location (mm) between methods.
- Clinical relevance: PSG more consistent and accurate, especially for complex cuts.
Veterinary Surgery
2
2024
Comparison of three-dimensional printed patient-specific guides versus freehand approach for radial osteotomies in normal dogs: Ex vivo model
2024-2-VS-townsend-3
In Lu 2025 et al., on SOP constructs, what was the effect of bending tees on **craniocaudal bending stiffness**?
🔍 Key Findings
- Bending tees significantly increased mediolateral bending stiffness, but not craniocaudal stiffness, in plate-bone constructs.
- Mean mediolateral stiffness was 43.2 N/mm with tees vs. 41.1 N/mm without (p = 0.0042), though the absolute difference was small.
- No significant differences were found in craniocaudal bending stiffness between constructs with or without tees (p = 0.89).
- Plastic deformation occurred in all constructs; no screw pull-out or implant breakage was observed.
- SOP nodes may resist compressive but not tensile deformation, suggesting variable mechanical contributions depending on loading direction.
- Craniocaudal bending had greater stiffness than mediolateral due to higher area moment of inertia along the node diameter.
- Clinical relevance of added stiffness from tees remains unclear, warranting further in vivo and cyclic testing.
- This was the first study to directly test SOP constructs with/without tees over a fracture gap in multiple planes.
Veterinary and Comparative Orthopaedics and Traumatology
2
2025
Comparison of Bending Stiffness between String of Pearls Plate-Bone Substitute Constructs with and without Bending Tees in a Fracture Gap Model
2025-2-VCOT-lu-1
In Walter de Bruyn 2024 et al., which of the following best explains the increased stiffness in orthogonal constructs?
🔍 Key Findings Summary
- Primary 3.5-mm LCP used with short (SWL), medium (MWL), and long (LWL) working lengths
- Addition of orthogonal 2.7-mm LCP resulted in:
- Significantly higher bending stiffness for SWL, MWL, and LWL (p < 0.0001)
- Higher torsional stiffness for MWL and LWL (not for SWL)
- Significantly lower strain across all working lengths in bending (p < 0.01)
- Working length inversely related to construct stiffness and directly to plate strain
- Orthogonal plates eliminated stiffness differences across working lengths in bending
- Suggests orthogonal plates can improve implant fatigue life and allow compensation when short working lengths are unachievable
Veterinary and Comparative Orthopedics and Traumatology
4
2024
Effect of an Orthogonal Locking Plate and Primary Plate Working Length on Construct Stiffness and Plate Strain in an In vitro Fracture-Gap Model
2024-4-VCOT-walterdebruyn-5
In Cortina 2023 et al., on modified TTT outcomes for MPL in dogs, what was the function of the tension band construct?
🔍 Key Findings
- m-TTT yielded a low overall major complication rate (4.3%) and minor complication rate of 15%, consistent with or better than previous techniques.
- Patellar reluxation occurred in only 4.3% of stifles, with high-grade reluxation seen in just 0.6% of cases—lower than the 12.4–21% range reported for other techniques.
- Implant migration rate was 3.7%, lower than previously reported for smooth pin fixation (7.7–24.6%).
- Use of a tension band with single Steinmann and Kirschner wire reduced stress risers and fixation failure, supporting better stability.
- Tibial tuberosity fracture occurred in only 1.3% of cases, lower than the 1–6% seen in other reports.
- All long-term major complications (1.3%) were related to pin migration, but were easily resolved.
- Radiographic follow-up confirmed complete bone healing in all examined cases, even up to 9 years postoperatively.
- Owner satisfaction was 100%, and 95% rated quality of life as good to excellent based on CBPI surveys.
Veterinary Surgery
5
2023
Outcomes and complications of a modified tibial tuberosity transposition technique in the treatment of medial patellar luxation in dogs
2023-5-VS-cortina-3
Quiz Results
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Key Findings