Giant Pseudotumour Following Ceramic on Polyethylene Total Hip Replacement

Area of Science:

• Orthopedic surgery
• Biomaterials science
• Immunology

Background:

• Ceramic on polyethylene (CoP) total hip replacement (THR) is generally safe.
• Pseudotumor formation is a rare complication, previously reported with metal-on-polyethylene and metal-on-ceramic bearings.
• This case presents the largest pseudotumor following CoP THR.

Observation:

• A patient with ankylosing spondylitis and chronic kidney disease developed a large pseudotumor 7 years after CoP THR.
• The pseudotumor was associated with extensive osteolysis and necrotic muscle mass.
• Due to severe bone loss, hip reconstruction was not feasible, necessitating hind-quarter amputation.

Findings:

• The study reports the largest pseudotumor formation after ceramic on polyethylene total hip replacement.
• Underlying conditions like ankylosing spondylitis and chronic kidney disease may exacerbate immune responses to implant materials.
• Early detection through serial radiography is crucial for timely intervention.

Implications:

• Patients with specific comorbidities require enhanced surveillance following total hip replacement.
• Prompt diagnosis and intervention can potentially prevent severe outcomes like amputation.
• Further research into immunomodulatory strategies may be beneficial for managing implant-related immune reactions.