M23.5: Chronic instability of knee

Chronic instability of the knee is a medical condition in which the knee joint is unable to maintain its normal alignment. This often leads to frequent knee giving out or buckling, making the affected individual prone to falls. This condition can be a result of an injury to ligaments that stabilize the knee, specifically the anterior cruciate ligament (ACL) and the posterior cruciate ligament (PCL). Damage to these ligaments can result in laxity which causes excessive movement of the knee bones, leading to a sense of uncertainty about knee movements, and sometimes, pain. Over time, the instability may worsen, leading to difficulties in daily activities like walking, climbing stairs, or getting up from a chair. Chronic instability of knee also increases the risk of developing other knee problems such as meniscal tears or osteoarthritis.

Patient Disclaimer

The information provided on this page is for general educational purposes only. It is not intended for self-diagnosis and does not replace professional medical advice. Always consult your doctor or a qualified healthcare provider with any questions or concerns about your health.

If you see an ICD diagnosis code (e.g., on a medical report), be aware that doctors may also include additional indicators to express diagnostic certainty. Only a healthcare professional can interpret these codes accurately in the context of your individual case.

For a complete understanding of your condition and what the diagnosis means for you, please speak directly with your doctor.