Ochronotic black meniscus during knee arthroscopy
Hira Lal Nag1, Vivek Singh, Sanjay Meena
1Department of Orthopaedics, All India Institute of Medical Sciences, New Delhi, India.
Journal of Natural Science, Biology, and Medicine
|October 2, 2013
Summary
Alkaptonuria, a rare metabolic disease, can cause ochronotic arthropathy. Early diagnosis via knee arthroscopy in a 30-year-old woman led to effective treatment and symptom relief.
Area of Science:
- Connective tissue diseases
- Metabolic disorders
- Orthopedic surgery
Background:
- Ochronotic arthropathy is a rare manifestation of alkaptonuria, a hereditary metabolic disorder.
- Alkaptonuria involves the deposition of homogentisic acid derivatives in connective tissues, leading to characteristic pigmentation and joint degeneration.
- Diagnosis often relies on clinical suspicion and laboratory confirmation.
Observation:
- A 30-year-old woman presented with a medial meniscus bucket handle tear requiring arthroscopic surgery.
- Intraoperative arthroscopic examination of the left knee revealed unusual brown-black discoloration of the articular cartilage and menisci.
- This unexpected finding prompted further investigation.
Findings:
- Laboratory evaluation confirmed the diagnosis of alkaptonuria based on the observed discoloration.
- The patient was diagnosed with ochronotic arthropathy secondary to alkaptonuria.
- The arthroscopic findings were crucial for identifying the underlying metabolic condition.
Implications:
- This case highlights the importance of arthroscopic visualization in diagnosing rare conditions like alkaptonuria.
- Timely medical and surgical intervention can effectively alleviate symptoms associated with ochronotic arthropathy.
- Early diagnosis and management are key to improving patient outcomes in this rare metabolic disease.
