Townsend et al: Comparison of three-dimensional printed patient-specific guides versus freehand approach for radial osteotomies in normal dogs: Ex vivo model
Veterinary Surgery 2, 2024

🔍 Key Findings:

• Design: Ex vivo study with 24 paired limbs from normal beagle dogs.
• Osteotomy types (3 groups):
  1. 30° uniplanar frontal wedge
  2. Oblique (30° frontal, 15° sagittal)
  3. 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.