1. Knee Arthroscopy: A Diagnostic and Therapeutic Tool for Management of Ochronotic Arthropathy 
William B. Stetson, M.D., Stephanie A. Morgan, M.P.A.P., P.A.-C., Nicole J. Hung, B.A., Samuel Polinsky, B.A. 
Arthroscopy Techniques 
Volume 7, Issue 11, Pages e1097-e1101 (November 2018)
DOI: /j.eats
Copyright © 2018 Arthroscopy Association of North America Terms and Conditions

2. Fig 1
Deposit of dark pigmented tissue in external right ear. Pigmented cartilaginous tissue is a common physical examination finding in patients with a diagnosis of ochronosis.
Arthroscopy Techniques 2018 7, e1097-e1101DOI: ( /j.eats )
Copyright © 2018 Arthroscopy Association of North America Terms and Conditions

3. Fig 2
Diagnostic arthroscopy of medial compartment of left knee. The medial compartment is spared of any ochronotic arthropathy.
Arthroscopy Techniques 2018 7, e1097-e1101DOI: ( /j.eats )
Copyright © 2018 Arthroscopy Association of North America Terms and Conditions

4. Fig 3
Diagnostic arthroscopy of lateral compartment of left knee. Severe degeneration of the left knee articular cartilage is noted.
Arthroscopy Techniques 2018 7, e1097-e1101DOI: ( /j.eats )
Copyright © 2018 Arthroscopy Association of North America Terms and Conditions

5. Fig 4
Diagnostic arthroscopy of patellofemoral compartment of left knee. The patellofemoral compartment is spared of any ochronotic arthropathy.
Arthroscopy Techniques 2018 7, e1097-e1101DOI: ( /j.eats )
Copyright © 2018 Arthroscopy Association of North America Terms and Conditions

6. Fig 5
Arthroscopic view of lateral compartment of left knee, showing evidence of dark pigmentation deep in lateral meniscus and synovium, consistent with ochronotic arthropathy.
Arthroscopy Techniques 2018 7, e1097-e1101DOI: ( /j.eats )
Copyright © 2018 Arthroscopy Association of North America Terms and Conditions

7. Fig 6
Arthroscopic view of lateral aspect of left knee. Severe degeneration of the left knee articular cartilage is noted. The dark pigmentation appears to penetrate deep into the bone.
Arthroscopy Techniques 2018 7, e1097-e1101DOI: ( /j.eats )
Copyright © 2018 Arthroscopy Association of North America Terms and Conditions

8. Fig 7
Arthroscopic view of lateral aspect of left (L) knee. A left knee partial lateral meniscectomy has been performed to debride the dark ochronotic tissue.
Arthroscopy Techniques 2018 7, e1097-e1101DOI: ( /j.eats )
Copyright © 2018 Arthroscopy Association of North America Terms and Conditions