🔍 Key Findings

Study population: 73 hips from 60 dogs undergoing cementless THR.
Methods evaluated:

• ACVD/ACOLL (acetabular circle on VD or OLL view)
• ALVD/ALOLL (acetabular line)
• FHCVD/FHCOLL/FHCCCHB (femoral head circle)

• Intraobserver repeatability and interobserver consistency were excellent for ACVD and ACOLL.
• FHC methods consistently underestimated actual cup size by 2.4–3.6 mm.
• AC and AL methods had low bias (±0.5 mm) and better predictive value.
• OA severity negatively affected the accuracy of all measurements (p < .05).
• Highest predictive accuracy was ~49% using ACVD with rounding down protocol.

🔍 Key Findings Summary

• F + P (forceps + plate compression) achieved the most uniform, high-pressure distribution across all quadrants.
• Kern forceps alone concentrated force in craniomedial quadrant, reducing caudal compression.
• Combining Kern + F improved craniolateral compression but did not restore caudal compression.
• Plate compression alone yielded caudal bias, not uniform pressure.
• Significant inter-method variation in quadrant-specific compression confirmed via ANOVA (p < 0.001 for all quadrants).

🔍 Key Findings

• 2.4 mm LCP with a 1.6 mm IM pin had the highest axial stiffness and yield strength among the tested constructs.
• Axial stiffness was significantly higher in the 2.4 mm LCP + 1.6 mm IM pin group compared to 2.7 mm LCP alone (p = .013).
• No significant difference in torsional stiffness was found among groups.
• 2.4 mm LCP + 1.0 mm pin had the lowest stiffness and failure load, underperforming both other constructs.
• All constructs failed via valgus bending, consistent with clinical observations in feline tibial fractures.
• A 1.6 mm pin (~50% canal fill) resulted in superior construct performance vs. 1.0 mm (~30% fill).
• Group 2 (2.4 LCP + 1.6 mm pin) outperformed the 2.7 mm LCP alone in stiffness, despite using a smaller plate.
• Plate–rod constructs may better preserve periosteal blood supply and support minimally invasive stabilization strategies.

🔍 Key Findings

Design: In vitro study on cadaveric femurs (n=21) with basilar femoral neck fractures stabilized using 2 vs 3 titanium cannulated screws.

Stiffness: Control > 3-screw > 2-screw (674 > 120 > 90 N/mm).

Yield Load: 3-screw (586 N) > 2-screw (303 N); both < intact femur (2692 N).

Displacement: No difference across groups.

Complication: 3-screw technique more demanding; higher risk of cortical perforation, especially with narrow femoral necks.

Failure Mode: Dislodgement of femoral head + screw shaft bending.

Conclusion: 3 screws = stronger construct than 2 screws. Clinical implications need further study.

🔍 Key Findings Summary

• F + P (forceps + plate compression) achieved the most uniform, high-pressure distribution across all quadrants.
• Kern forceps alone concentrated force in craniomedial quadrant, reducing caudal compression.
• Combining Kern + F improved craniolateral compression but did not restore caudal compression.
• Plate compression alone yielded caudal bias, not uniform pressure.
• Significant inter-method variation in quadrant-specific compression confirmed via ANOVA (p < 0.001 for all quadrants).

🔍 Key Findings

• Dogs with MPL had significantly shallower femoral trochlear grooves compared to controls, based on CT-measured femoral trochlear groove angle (FTGA).
• FTGA >134° in small breeds (SB) and >128° in medium/large breeds (MLB) were associated with MPL and can serve as surgical thresholds for considering trochleoplasty.
• FTA and FTRIA measurements were less reliable, showing lower sensitivity/specificity than FTGA.
• Inter-rater reliability for FTGA was excellent (ICC > 0.9), supporting its use in clinical decision-making.
• FTGA differed significantly between SB and MLB dogs, suggesting anatomical variation influences MPL predisposition.
• Dogs with MPL but with FTGA below threshold may not benefit from trochleoplasty, supporting individualized surgical planning.
• CT provides more precise and reproducible evaluation of trochlear morphology than radiography or ultrasound.
• The study introduces a CT protocol using P25 and P50 reference points for consistent FTGA measurement.

🔍 Key Findings Summary

• F + P (forceps + plate compression) achieved the most uniform, high-pressure distribution across all quadrants.
• Kern forceps alone concentrated force in craniomedial quadrant, reducing caudal compression.
• Combining Kern + F improved craniolateral compression but did not restore caudal compression.
• Plate compression alone yielded caudal bias, not uniform pressure.
• Significant inter-method variation in quadrant-specific compression confirmed via ANOVA (p < 0.001 for all quadrants).

🔍 Key Findings

• Simulated quadriceps and gastrocnemius forces increased proportionally with axial load in all three femoral fixation models.
• Model 2 (rigid fixation) resulted in subphysiologic quadriceps forces and abnormally high gastrocnemius forces, reducing model fidelity.
• Models 1 and 3 (with hip mobility) produced more physiologic quadriceps and force ratios, especially under 30–40% bodyweight loads.
• Force ratios were significantly lower in rigid fixation (Model 2) compared to hip-mobile models (p = .007), suggesting model design affects simulated muscle coordination.
• Joint angles (stifle and hock) remained within acceptable limits, though slight flexion occurred with increasing load.
• Relative foot position differed by ~3.9 mm between models 2 and 3, with model 2 showing a more caudal position.
• Model 3 preserved benefits of hip mobility while allowing radiographic documentation, making it a preferred setup for future studies.
• The study suggests that models used in feline stifle stabilization research may underestimate physiologic forces, especially with rigid fixation designs.

🔍 Key Findings

• Spacer pin fixation showed no difference in failure force or stiffness compared to tension band wire (TBW) or 2-pin techniques.
• All constructs failed under loads >1000 N, exceeding estimated peak quadriceps force in dogs during walking (~240 N).
• Patellar ligament failure was the most common mode of failure across all groups (5–8 samples per group).
• Distal tibial crest fractures were seen only in 2-pin and spacer pin groups, not in TBW group, suggesting TBW may protect against crest failure.
• No failures occurred at pin tracts, possibly due to pin placement within patellar ligament footprint.
• Spacer pin technique avoids placing pins through the tuberosity, potentially reducing risks of soft tissue complications like tendinopathy or irritation.
• Use of partial osteotomy with robust distal crest may substitute for TBW without compromising initial mechanical strength.
• Further in vivo or cyclic loading studies are required, as this cadaveric study tested only acute tensile failure.