Patellofemoral instability is a result of malalignment of the patella in the trochlear grove caused by stretched or ruptured medial kneecap-stabilizers (traumatic) or anatomical anomalies of the knee joint.

Patellar instability means your patella (kneecap) slips out of the femoral groove in your thighbone. An unstable kneecap can lead to a dislocated knee. Physical therapy and leg braces can help.

2024年12月30日 · Patellar instability is a condition characterized by patellar subluxation or dislocation episodes as a result of injury, ligamentous laxity or increased Q angle of the knee.

What is patellofemoral or patellar (kneecap) instability? Patients who have a tracking problem in the patellofemoral joint, where the patella (kneecap) does not stay in the groove on the femur, are vulnerable to a spectrum of knee conditions.

2025年2月12日 · Patellofemoral instability is the where the patella does not remain in the trochlear groove during normal knee range of motion. Most patients with patellar instability are young and active individuals, especially females in their second decade 2. Incidence is ~25 (range 6-77) per 100,000 person-years 2,9,12.

What is patellar instability? The patella (kneecap) attaches to the femur (thigh bone) and tibia (shin bone) by tendons. The patella fits into a groove at the end of the femur (trochlear groove) and slides up and down as the knee bends and straightens. Patellar instability occurs when the kneecap moves outside of this groove.

2023年9月4日 · Patellar instability, by definition, is a condition where the patella bone pathologically disarticulates out from the patellofemoral joint, either subluxation or complete dislocation. This most often involves multiple factors, from acute trauma, chronic ligamentous laxity, bony malalignment, connective tissue disorder, or anatomical pathology.

As long as your patella stays in its groove (trochlea) in the knee, you can walk, run, sit, stand, and move easily. When the kneecap slips out of the groove, recurrent instability (the kneecap dislocates often) and pain may result.

2023年5月15日 · Patellofemoral instability is a sensation of the kneecap slipping or feeling loose. It causes pain and swelling at the front of the knee and has a number of causes including previous patella dislocation injury. We classify it into primary instability and secondary instability.

Diagnosis of Patellofemoral Instability. Pain in the front of the knee and a sensation of "looseness" of the kneecap are common complaints. If the patella partially dislocates (subluxates), the knee will "give way" or buckle.