Misc: Ortho Implants - probably just look at doc with pics? Flashcards
Nabholz VCOT 2019 PQ
Safety and accuracy of minimally invasive long bone fracture repair using a 2.5 mm interlocking nail: a cadaveric feline study
The use of fluoroscopy did not lead to significant differences in any of the outcome measures
Intraoperative complications predominantly occurred in the distal humerus (12/32) & the proximal femur (7/32)
In total 20/96 complications occurred with no complications for the tibia
Significantly less complications in tibia vs humerus
Included iatrogenic fractures, fissures, and neurovascular trauma
Neurovascular structures were only damaged at the medial side of the distal humerus (10/32)
Conclusion: safely applied percutaneously to tibia & limitations to femur in normal cadaveric cats w/o fluoroscopy; high # of complications leading to consider humerus not safe for TVS
Palierne VCOT 2019 PQ
Biomechanical comparison of 2 locking plate constructs under cyclic loading in 4-point bending in a fracture gap model: 2 screws versus 3 screws per fragment
3 screw constructs were stiffer than the 2 screw constructs (19.73 N/mm vs 15.5 N/mm respectively) & the interfragmentary relative displacements were higher for 2 screw constructs (11%) than for 3 screw constructs (8%)
Difference between the # of cycles to failure for the 3 screw constructs (162,448 cycles) and the 2 screw constructs (143,786 cycles) was not significant
Failure in all constructs was due to plate fracture at the level of the compression holes
Conclusion: omission of the 3rd innermost locking screw during bridging osteosynthesis subjected to bending forces led to a 20% reduction in construct stiffness & increased relative displacement (+39.6%) but did not change fatigue life
Thompson Vet Sx 2020 PQ
Influence of wire configuration on resistance to fragment distraction of tension bands placed in a greater trochanteric osteotomy model
- What procedure was best/strongest?
4 tension band configurations = figure of 8 with one twist (OT), figure of 8 with two twists (TT), dual interlocking single loop (DISL), and double loop (DL)
The initial tension and load to 2 mm of displacement were lower for OT wires compared with TT wires
The twist-and lay method of tying was effective for TT configuration, increasing tension by an avg 39% after bending over twisted wire
The DL was the strongest and most stable configuration*, generating 2.3 – 3.5 times greater initial tension, maintaining a greater percentage of residual tension under incremental cyclic loads, & resisting 2-2.4 times greater load before failure at 2 mm
Failure load was highly correlated with initial tension
Conclusion: wire configurations reaching greater initial tension such as DL, allowed constructs to resist higher tensile loads
