Total knee arthroplasty in ochronosis

Area of Science:

• Biochemistry
• Orthopedic Surgery
• Genetics

Background:

• Alkaptonuria is a rare metabolic disorder caused by homogentisic oxidase deficiency.
• This deficiency leads to homogentisic acid excretion and pigment deposition in connective tissues, causing ochronosis.
• Ochronosis results in tissue weakening, chronic inflammation, and osteoarthritis, particularly in joints like the knee.

Purpose of the Study:

• To report a case of ochronosis affecting the knee in a patient with alkaptonuria.
• To evaluate the outcomes of total knee replacement in managing ochronotic osteoarthritis.
• To share surgical considerations and pearls for operating on patients with this rare condition.

Main Methods:

• A case report of a patient with alkaptonuria and knee ochronosis.
• Surgical treatment involving total knee replacement.
• Documentation of operative findings and outcomes.

Main Results:

• The patient with ochronosis of the knee was treated with total knee replacement.
• Outcomes of the total knee replacement were comparable to those in patients without ochronosis.
• Specific surgical pearls for managing ochronosis during knee replacement were identified.

Conclusions:

• Total knee replacement is a viable and effective treatment for ochronotic osteoarthritis of the knee.
• Surgical management of alkaptonuria-related ochronosis requires specific considerations.
• This case highlights the importance of tailored surgical approaches for rare genetic disorders affecting joints.