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Kang et al: Biomechanical Comparison of Double 2.3-mm Headless Cannulated Self-Compression Screws and Single 3.5-mm Cortical Screw in Lag Fashion in a Canine Sacroiliac Luxation Model
Veterinary and Comparative Orthopedics and Traumatology 1, 2024

🔍 Key Findings Summary

  • 20 cats with pelvic fractures treated using locking plates with only cortical screws
  • 28 fractures stabilized (ilium: 17, acetabulum: 6, ischium: 3, pubis: 2)
  • Implants: Primarily 1.5/2.0 mm LCPs or String-of-Pearls plates
  • Major complications in 2/20 cases (10%): sciatic entrapment, malunion requiring THA
  • Minor complications in 2/20 cases (10%): plate impingement, transient lameness
  • Clinical union in all cats by 8 weeks; all cats returned to full function
  • Authors conclude cortical screws alone can provide adequate fixation in feline pelvic fractures if screw purchase and bone quality are sufficient

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Kang et al: Biomechanical Comparison of Double 2.3-mm Headless Cannulated Self-Compression Screws and Single 3.5-mm Cortical Screw in Lag Fashion in a Canine Sacroiliac Luxation Model
Veterinary and Comparative Orthopedics and Traumatology 1, 2024

🔍 Key Findings Summary

  • 20 cats with pelvic fractures treated using locking plates with only cortical screws
  • 28 fractures stabilized (ilium: 17, acetabulum: 6, ischium: 3, pubis: 2)
  • Implants: Primarily 1.5/2.0 mm LCPs or String-of-Pearls plates
  • Major complications in 2/20 cases (10%): sciatic entrapment, malunion requiring THA
  • Minor complications in 2/20 cases (10%): plate impingement, transient lameness
  • Clinical union in all cats by 8 weeks; all cats returned to full function
  • Authors conclude cortical screws alone can provide adequate fixation in feline pelvic fractures if screw purchase and bone quality are sufficient

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Multiple Choice Questions on this study

In Kang 2024 et al., on sacroiliac fixation strength, what was the primary failure mode for the double 2.3-mm HCS group?

A. Screw bending and pullout
B. Compression loss at ilium
C. Cancellous bone failure in sacrum
D. Screw loosening at ilium
E. Rotational failure at ilial cortex

Answer: Cancellous bone failure in sacrum

Explanation: Failure was typically within the sacral bone; no screw head pullout noted in HCS group
In Kang 2024 et al., on sacroiliac fixation strength, what was the statistically significant difference in screw diameter to sacral diameter ratio between groups?

A. HCS: 70%, Lag: 50%
B. HCS: 50%, Lag: 70%
C. HCS: 38%, Lag: 62%
D. HCS: 62%, Lag: 38%
E. HCS: 45%, Lag: 45%

Answer: HCS: 38%, Lag: 62%

Explanation: Table 1 showed HCS screws were smaller relative to sacral width; lag screw occupied larger percentage
In Kang 2024 et al., on sacroiliac fixation strength, which construct had significantly higher maximum failure load under rotational force testing?

A. Single 3.5-mm cortical screw in lag fashion
B. Double 2.0-mm cortical screws
C. Double 2.3-mm headless cannulated screws
D. 3.5-mm cortical screw with washer
E. Single 2.3-mm headless cannulated screw

Answer: Double 2.3-mm headless cannulated screws

Explanation: Double HCS provided significantly higher failure load vs single lag screw fixation
In Kang 2024 et al., on sacroiliac fixation strength, which implant required significantly longer placement time?

A. 3.5-mm lag screw
B. 2.3-mm cortical screw
C. 2.3-mm headless cannulated screws
D. Both were similar
E. SOP locking plate

Answer: 2.3-mm headless cannulated screws

Explanation: Mean placement time for HCS was 712 sec vs 379 sec for CS group (p<0.001)
In Kang 2024 et al., on sacroiliac fixation strength, which statement best describes screw placement accuracy in both groups?

A. More screw misplacements in lag group
B. HCS had frequent canal violations
C. All screws stayed within sacral body
D. At least one screw breached spinal canal
E. Lag group had better accuracy

Answer: All screws stayed within sacral body

Explanation: CT confirmed safe placement in all dogs; no breaches of spinal canal or sacral foramen

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