Quiz Question
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 Deprey 2022 et al., on gap fracture implants, which material was the NAS-ILN made of?
🔍 Key Findings
- NAS-ILN had significantly greater stiffness in both axial compression and 4-point bending compared to LCP constructs.
- Ultimate load to failure was significantly higher for NAS-ILN in compression (804 N vs 328 N) and bending (25.7 Nm vs 16.3 Nm).
- Torsional stiffness and angular deformation were similar, but NAS-ILN resisted higher torque to failure than LCP (22.5 Nm vs 19.1 Nm).
- No slack was observed with the NAS-ILN construct, unlike older nail designs.
- Failure modes differed: LCPs failed via plate bending; NAS-ILNs failed at the implant or bone near screw holes.
- Titanium alloy and curved design of NAS-ILN provides better anatomic fit and more uniform stress distribution.
- A third, perpendicular locking hole in NAS-ILN may enhance torsional stability but was not utilized in this study.
- The curved, angle-stable design of NAS-ILN is a novel advancement in veterinary orthopedics.
Veterinary Surgery
8
2022
Mechanical evaluation of a novel angle‐stable interlocking nail in a gap fracture model
2022-8-VS-deprey-4
In Cheon 2025 et al., on guide accuracy in DFO, which of the following was a limitation of the universal guide?
🔍 Key Findings
- Both patient-specific and universal guides yielded correction errors <2°, with no statistically significant difference in accuracy.
- Universal guide corrected aLDFA up to 24° and AA up to 20°, addressing multiplanar deformities effectively.
- Patient-specific guides allowed for preoperative simulation, providing more stable pin placement and potentially aiding less-experienced surgeons.
- Universal guide eliminated the need for CT-based customization, reducing time and cost.
- Cadaver and bone model trials showed consistent accuracy, validating both methods in vitro and ex vivo.
- No significant differences in outcome when correcting uniplanar (aLDFA) vs biplanar (aLDFA + AA) deformities.
- Universal guide's fixed size presented limitations in small dogs, potentially requiring multiple size options.
- Universal guide showed potential for standard use, offering repeatable outcomes with minimal prep despite needing precise intraoperative placement.
Veterinary and Comparative Orthopaedics and Traumatology
3
2025
Comparing the Accuracy of Patient-Specific Guide and Universal Guide for Distal Femoral Osteotomy in Dogs
2025-3-VCOT-cheon-4
In Trefny 2025 et al., on plate length and stiffness, strain in the bone model adjacent to the plate end was significantly lower in which configurations?
🔍 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-3
In Sisk 2024 et al., on intramedullary nails, what biomechanical property is most affected by increasing nail diameter?
🔍 Key Findings Summary
- IMN provides relative stability, resists bending/torsion due to central axis alignment
- Larger diameter nails = exponentially greater stiffness (∝ D⁴)
- Trade-off: Larger interlocking holes weaken fatigue strength of the nail
- Reaming increases contact/stability but has pros/cons:
- Improves outcomes in closed fractures
- May reduce endosteal blood flow in thin-walled bones (e.g., cats)
- Design advances:
- Angle-stable IMN reduce rotational slack
- Expandable nails simplify insertion but may compromise removal or compressive load resistance
- Precontoured nails match bone curvature but lack consistent clinical superiority
- Material debates continue (e.g., titanium vs. stainless steel vs. magnesium)
Veterinary and Comparative Orthopedics and Traumatology
6
2024
Biomechanical Principles of Intramedullary Nails in Veterinary and Human Medicine
2024-6-VCOT-sisk-1
In Miller 2024 et al., on SOP-LC mechanical testing, which configuration improved initial torsional stiffness?
🔍 Key Findings Summary
- No significant difference in mechanical properties between contoured vs non-contoured SOP-LC rods
- Clamp configuration significantly influenced mechanical performance:
- Single-side clamps → ↑ yield load, ↑ displacement, ↑ bending strength (p < 0.05)
- Alternating-side clamps → ↑ initial torsional stiffness (p = 0.029)
- Clamp slippage was evident only in torsional tests; screw loosening may be torque-dependent
- Mild screw bending and construct offset suggest subtle instability
- Recommends clamp configuration choice based on loading scenario
- Suggests 3.0 Nm torque may be more effective than 2.5 Nm to prevent clamp slippage
Veterinary and Comparative Orthopedics and Traumatology
4
2024
Mechanical Testing of Sliding on Pivot-Locking Clamp (SOP-LC) Fracture Repair System in Four-Point Bending and Torsion
2024-4-VCOT-miller-3
In Smith 2024 et al., on ergonomics and preferences in veterinary laparoscopy, which laparoscopic instrument was reported as the most difficult to use overall?
🔍 Key Findings
- Surgeons with smaller glove sizes experienced more difficulty using laparoscopic instruments, especially endoscopic staplers, cup biopsy forceps, and vessel sealing devices.
- Endoscopic stapler was rated the most difficult instrument, with a median difficulty score of 4/10 and 25% usage difficulty.
- Female surgeons reported significantly more difficulty with several instruments due to smaller glove size.
- Reusable instruments were preferred over disposable ones for all tasks.
- Pistol grips were preferred for grasping/retracting and fine dissection, while axial grips were preferred for suturing/knot tying.
- Articulating handles were consistently associated with increased reported difficulty, especially with scissors and cup biopsy forceps.
- Left-handed surgeons had more difficulty operating endoscopic staplers, suggesting limited design inclusivity.
- Surgeons in academic settings reported more difficulty with laparoscopic maneuvers than those in private practice.
Veterinary Surgery
3
2024
Variables affecting surgeons’ use of, and preferences for, instrumentation in veterinary laparoscopy
2024-3-VS-smith-1
In Gomes 2025 et al., on subdural shunting for TL-AD, what was the guideline for selecting shunt tube size?
🔍 Key Findings
- Modified subdural shunt (SDS) placement was adapted from prior techniques using a hemilaminectomy approach and no suturing of the dura or shunt.
- Dogs receiving SDS had significantly better long-term outcomes (85.7% improved) compared to those with durotomy alone (41.7%).
- Recurrence rate was lower in the SDS group (14.3%) than control (41.7%), though not statistically significant.
- Most recurrences occurred in Pugs (5/7), suggesting a breed predisposition.
- Shunt size was limited to 25% of spinal cord diameter, typically 3–3.5 Fr.
- CSF flow through the shunt was confirmed intraoperatively, supporting the role of SDS in maintaining flow and possibly preventing recurrence.
- Immediate postoperative outcomes were not different between groups (≈42% deteriorated), but long-term recovery was better with SDS.
- Steroid use pre-surgery did not correlate with improved outcome; fewer SDS dogs received steroids pre-op.
Veterinary Surgery
5
2025
Post‐surgical outcome and recurrence rates in thoracolumbar arachnoid diverticula undergoing durotomy alone or alongside a modified technique of subdural shunt-placement in dogs
2025-5-VS-gomes-4
In Walter de Bruyn 2024 et al., how did orthogonal plate application affect strain in four-point bending?
🔍 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-2
In David 2024 et al., on single-port cryptorchidectomy, why was a 6 mmHg capnoperitoneum preferred?
🔍 Key Findings
- Single-port laparoscopic-assisted cryptorchidectomy (SP-LAC) was feasible in 13/14 dogs with abdominal cryptorchidism.
- Median surgical time was 17 min for unilateral and 27 min for bilateral cryptorchidectomy.
- All testes were successfully exteriorized through a 15-mm mini-celiotomy in most dogs; only 2 needed slight enlargement.
- One major complication occurred (testicular artery hemorrhage, requiring conversion to open surgery).
- Two minor complications involved trocar-related issues (splenic capsule laceration, capnoretroperitoneum).
- No incisional complications were reported postoperatively; some dogs had mild dermatitis at the clipped site.
- The technique requires only one surgeon and no advanced tools beyond a single-port endoscope.
- Low-pressure capnoperitoneum (6 mmHg) was adequate for visualization in most cases.
Veterinary Surgery
3
2024
Single-port laparoscopic-assisted abdominal cryptorchidectomy in 14 dogs
2024-3-VS-david-5
Quiz Results
You answered 7 out of 10 questions correctly
Key Findings