Recurrent patella loosening and extra-articular migration after TKA

Area of Science:

• Orthopedic Surgery
• Biomedical Engineering

Background:

• Total knee arthroplasty (TKA) is a common procedure for end-stage knee arthritis.
• Patellar component loosening is a known, albeit infrequent, complication.
• Extra-articular migration presents unique challenges in revision surgery.

Observation:

• A patient experienced recurrent aseptic loosening of the patellar component post-TKA.
• The patellar component migrated outside the joint capsule (extra-articular).
• This complication occurred despite previous interventions.

Findings:

• The case demonstrates a rare instance of aseptic loosening and extra-articular migration of a patellar component.
• Surgical intervention involved the removal of the migrated patellar component.
• No patellar component replacement was performed in this specific case.

Implications:

• This case expands the understanding of rare TKA complications.
• It suggests that component removal without replacement can be a viable treatment strategy for severe patellar issues.
• Further research may explore optimal management for such complex cases.