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Kang et al: Zygomatic arch reconstruction with a patient-specific polycaprolactone beta-tricalcium phosphate scaffold after parosteal osteosarcoma resection in a dog
Veterinary Surgery 8, 2022

🔍 Key Findings

  • Patient-specific 3D-printed PCL/β-TCP scaffold enabled successful zygomatic arch reconstruction in a dog.
  • Complete surgical resection of a zygomatic parosteal osteosarcoma was achieved, with a 0.3 mm histologically clean margin.
  • Post-op imaging showed progressive tissue ingrowth into the scaffold, with Hounsfield Units increasing from 20.4 to 97.8 over 10 months.
  • No complications (e.g., infection, displacement) or tumor recurrence were noted at 16-month follow-up.
  • Use of a patient-specific osteotomy guide improved anatomical fit and facilitated precise excision and implant placement.
  • Facial symmetry and orbital stability were maintained throughout follow-up.
  • The scaffold remained structurally stable despite limited bone regeneration, suggesting connective tissue filled the defect.
  • Topical mitomycin C was applied intraoperatively for possible anti-neoplastic effect, but efficacy remains unclear.

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← Articles

Kang et al: Zygomatic arch reconstruction with a patient-specific polycaprolactone beta-tricalcium phosphate scaffold after parosteal osteosarcoma resection in a dog
Veterinary Surgery 8, 2022

🔍 Key Findings

  • Patient-specific 3D-printed PCL/β-TCP scaffold enabled successful zygomatic arch reconstruction in a dog.
  • Complete surgical resection of a zygomatic parosteal osteosarcoma was achieved, with a 0.3 mm histologically clean margin.
  • Post-op imaging showed progressive tissue ingrowth into the scaffold, with Hounsfield Units increasing from 20.4 to 97.8 over 10 months.
  • No complications (e.g., infection, displacement) or tumor recurrence were noted at 16-month follow-up.
  • Use of a patient-specific osteotomy guide improved anatomical fit and facilitated precise excision and implant placement.
  • Facial symmetry and orbital stability were maintained throughout follow-up.
  • The scaffold remained structurally stable despite limited bone regeneration, suggesting connective tissue filled the defect.
  • Topical mitomycin C was applied intraoperatively for possible anti-neoplastic effect, but efficacy remains unclear.

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Multiple Choice Questions on this study

In Kang 2022 et al., on 3D scaffold reconstruction, what was one key advantage of using a patient-specific osteotomy guide?

A. Reduced cost of surgery
B. Allowed intraoperative adjustment of margins
C. Enabled real-time 3D printing
D. Improved anatomic fit for scaffold placement
E. Enhanced tumor visualization during surgery

Answer: Improved anatomic fit for scaffold placement

Explanation: The custom guide helped match the bone defect with the scaffold for better stability and alignment.
In Kang 2022 et al., on 3D scaffold reconstruction, what was the primary diagnosis confirmed after tumor excision?

A. Multilobular osteochondrosarcoma
B. Fibrosarcoma
C. Fibrous dysplasia
D. Parosteal osteosarcoma
E. Ossifying fibroma

Answer: Parosteal osteosarcoma

Explanation: Histopathology confirmed a well-differentiated variant of parosteal osteosarcoma.
In Kang 2022 et al., on 3D scaffold reconstruction, which material was combined with polycaprolactone (PCL) to enhance osteoconductivity?

A. Hydroxyapatite
B. Polylactic acid
C. Beta-tricalcium phosphate
D. Chitosan
E. Bone morphogenetic protein-2

Answer: Beta-tricalcium phosphate

Explanation: β-TCP was used to improve hydrophilicity and bone regeneration potential of PCL.
In Kang 2022 et al., on 3D scaffold reconstruction, what was the Hounsfield Unit (HU) measurement trend in the scaffold area over time?

A. Decreased from 100 to 20
B. Remained unchanged (~50 HU)
C. Increased from 20.4 to ~98
D. HU dropped initially and normalized at 6 months
E. Fluctuated without trend

Answer: Increased from 20.4 to ~98

Explanation: HU values rose over time, indicating progressive tissue ingrowth (though not full bone regeneration).
In Kang 2022 et al., on 3D scaffold reconstruction, what was the histological status of the surgical margins after resection?

A. Positive margin at 5 mm
B. Complete excision with 2 mm clean margin
C. Marginal but histologically positive
D. Complete excision with 0.3 mm clean margin
E. Incomplete resection with tumor spillage

Answer: Complete excision with 0.3 mm clean margin

Explanation: A 0.3 mm clear margin was achieved; in human literature, such margins are considered adequate for this tumor type.

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