1. Total knee arthroplasty in ochronosis
Vaibhav G. Patel, MBBS 
Arthroplasty Today 
Volume 1, Issue 3, Pages (September 2015)
DOI: /j.artd
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2. Figure 1
Diagram showing how phenylalanine is metabolized demonstrating how homogentisate 1,2 dioxygenase deficiency causes accumulation of homogentisic acid and causes alkaptonuria.
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3. Figure 2
Pre-operative anteroposterior and lateral radiographs of the right knee suggesting features of osteoarthritis.
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4. Figure 3 Subcutaneous nodules observed during surgery.
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5. Figure 4 Soft tissue involvement in ochronosis.
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6. Figure 5
Black stiff menisci, articular cartilage and cut surfaces of the tibia and femur.
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7. Figure 6 Ochronotic involvement of undersurface of patella.
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8. Figure 7 Subchondral bone uninvolved in ochronosis.
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9. Figure 8
Anteroposterior and lateral radiographs of the right knee obtained in the recovery room after cemented total knee arthroplasty for ochronosis of the knee and secondary arthropathy.
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