PT  - JOURNAL ARTICLE
AU  - Bhairavi Vivegananthan
AU  - Rohi Shah
AU  - A S Karuppiah
AU  - S V Karuppiah
TI  - Metallosis in a total knee arthroplasty
AID  - 10.1136/bcr-2013-202801
DP  - 2014 Mar 18
TA  - BMJ Case Reports
PG  - bcr2013202801
VI  - 2014
4099  - http://casereports.bmj.com/content/2014/bcr-2013-202801.short
4100  - http://casereports.bmj.com/content/2014/bcr-2013-202801.full
AB  - A 70-year-old woman presented with right knee pain and a ‘grinding’ sensation 6 months after a total knee replacement for osteoarthritis. Clinical examination revealed a valgus deformity, patellofemoral crepitus and a reduced knee flexion. Radiographs revealed distinctive findings including the ‘bubble sign’, ‘cloud sign’ and the ‘metal line sign’, which are diagnostic of metallosis.Metallosis is an uncommon complication of total joint replacements, where bone and periprosthetic soft tissues are infiltrated by metallic debris from wearing of the prostheses. This usually occurs in high-wear joints such as hips and knees. Treatment for patients diagnosed with metallosis is synovectomy and a revision surgery. Our patient underwent revision surgery 5 years after her initial surgery.