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Metallosis in a total knee arthroplasty
Bhairavi Vivegananthan1, Rohi Shah, A S Karuppiah
1Emergency Department, Kings Mill Hospital, Nottingham, Nottinghamshire, UK.
BMJ Case Reports
|March 20, 2014
Summary
Metallosis, a rare complication of total knee replacement, involves metallic debris infiltrating tissues. Distinctive radiographic signs like the
Area of Science:
- Orthopedic Surgery
- Biomaterials Science
Background:
- Total knee replacement (TKR) is a common procedure for osteoarthritis.
- Metallosis is an uncommon but serious complication of joint replacement surgery.
Observation:
- A 70-year-old woman experienced right knee pain and grinding 6 months post-TKR.
- Clinical findings included valgus deformity and reduced knee flexion.
- Radiographs showed the 'bubble sign', 'cloud sign', and 'metal line sign'.
Findings:
- These radiographic signs are diagnostic of metallosis.
- Metallosis results from metallic debris from prosthesis wear infiltrating bone and soft tissues.
- High-wear joints like the knee are susceptible to this complication.
Implications:
- Prompt diagnosis and treatment are crucial for managing metallosis.
- Treatment typically involves synovectomy and revision surgery.
- This case highlights the importance of recognizing radiographic signs of metallosis after TKR.
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