Patellar instability refers to the knee cap being unstable where it usually resides. Causes patellar dislocation A patellar dislocation occurs when a twisting injury to the knee joint causes the knee cap to dislocate. It usually occurs in sports when an athlete makes a plant and changes direction or performs a cutting motion.
Primary patellar dislocation continues to be a common problem facing clinicians today. These injuries are associated with significant morbidity and a substantial recurrence rate.
Myriad operative and nonoperative options have been described to treat these injuries, although the evidence-based literature is sparse. PubMed was searched from to identify publications on patellar dislocations, including clinical presentation, natural history, radiographic workup, and treatment.
The initial workup of a patella dislocation includes a history, physical examination, and radiographs. If there is evidence of a displaced osteochondral fragment or hemarthrosis, then magnetic resonance imaging should be obtained.
The treatment of first-time patella dislocators has been controversial, and no study has demonstrated a clear benefit to early operative intervention.
First-time patellar dislocations should be treated conservatively unless there is evidence of a displaced osteochondral fragment. Acute patellar dislocations are a common problem faced by orthopaedic surgeons and can be associated with prolonged disability and high rates of recurrence.
For these reasons, surgical intervention has been advocated in an attempt to reduce the recurrence rate, 1819 which has led to confusion and controversy regarding surgical indications in the acute setting.
Great strides have recently been made in our understanding of the natural history of primary patellar dislocations. Most literature consists of case series, representing the experience of a single author and thus making meaningful comparisons difficult.
Several prospective trials have recently been published, which aid in clinical decision making.What is a patellar dislocation? A patellar dislocation occurs when your patella (kneecap) is forced out of place. It can be caused by a fall or a direct blow to your knee.
It can also happen if your knee twists or rotates. It is most likely to happen during physical activity, such as sports, military training, or dance.
The patella, also known as the kneecap, is a thick, circular-triangular bone which articulates with the femur (thigh bone) and covers and protects the anterior (front) articular surface of the knee joint.
A dislocation of the kneecap occurs when the patella comes completely out of its groove on the end of the thigh bone (femur), and comes to rest on the outside of the knee joint. Kneecap dislocations usually occur as a significant injury the first time the injury occurs, but the kneecap may dislocate much more easily thereafter.
Patella is the small piece of bone in front of the knee that slides up and down the femoral groove (groove in the femur bone) during bending and stretching movements. The average annual incidence of primary patellar dislocation is per in the general population, with the highest incidence in the to year age group (29 per ).
9 The majority of these patients will not experience further instability, with reported recurrence rates of 15% to 44% after conservative treatment.
|Patellar dislocation - Wikipedia||Rehabilitation following first-time patellar dislocation: Primary traumatic patellar dislocation.|
|What is a patellar dislocation?||Mechanism of injury Patellar dislocation is usually caused by either a direct trauma to the knee e. A dislocation occurs when the patella shifts out of its normal position in the patellofemoral groove trochleathe V-shaped notch on the front of the femur.|
|What causes a patellar dislocation?||What is a patellar dislocation? A patellar dislocation occurs when your patella kneecap is forced out of place.|
|Patella dislocation||What causes a patellar dislocation?|
|WHAT YOU NEED TO KNOW:||Patients usually present with an inability to extend an obviously deformed knee.|
6,9,10 Although recurrence is the exception and not the rule, many patients . Depending on the severity of the patellar subluxation, the improper tracking may not cause the individual any symptoms, or it could lead to dislocation of the patella (where the kneecap fully comes out of the groove).
Most commonly, patellar subluxations cause discomfort with activity and pain around the sides of the kneecap, called patellofemoral .