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Patellofemoral instability and dysfunction are frequent symptoms in Nail patella syndrome (NPS). In this article, the first large series of NPS patients is presented in which these knee symptoms were assessed using validated outcome scores.
Symptoms. The main symptom of chondromalacia patella is pain. The pain occurs beneath and on both sides of the kneecap. Other characteristics of the pain: 1  The pain can be acute or chronic. 2  A popping or cracking sound is often heard as the knee is flexed and extended.