Knee Extensor Apparatus Reconstruction with Allograft after Patellar Resection: A Case Report

Area of Science:

• Orthopedic Oncology
• Musculoskeletal Reconstruction
• Biomaterials Science

Background:

• The knee extensor apparatus, crucial for mobility and stability, transmits quadriceps strength to the tibia.
• Irreparable patellar damage, often from aggressive bone tumors, necessitates restoration of the extensor mechanism's integrity.
• Reconstruction challenges include maintaining anatomical continuity and functional strength of the extensor apparatus.

Observation:

• A 39-year-old male with a history of lung carcinoma presented with left knee swelling and degeneration of the patella.
• An en bloc resection of the patella and surrounding extensor apparatus soft tissues was performed.
• The defect was reconstructed using a massive allograft comprising the quadriceps tendon, patella, and patellar ligament.

Findings:

• The patient experienced no complications or local recurrences post-surgery.
• Full restoration of knee extension and quadriceps strength was achieved at the latest follow-up.
• The massive allograft successfully reconstructed the knee extensor apparatus.

Implications:

• Massive allografts offer a reliable solution for complex patellar and extensor apparatus reconstruction in orthopedic oncology.
• This approach can restore function and stability in patients with extensive knee pathology.
• Further research into allograft integration and long-term outcomes is warranted.