What is Patellar Subluxation? What do you Need to Know About? ![](https://i.imgur.com/wI28fsN.jpg) Partial dislocation of the kneecap is known as **[patellar subluxation](https://www.tadalive.com/blog/22721/what-is-patellar-subluxation-what-do-you-need-to-know-about/)**. Subluxation is a term coined for the partial dislocation of the bone. Patellar subluxation is also called patellar instability or kneecap instability.