Patellar Dislocation القاهرة

Patellar Dislocation

DEFINITION


• Patellar dislocation occurs when there

is no contact between the patella and

the trochlear groove.


• Patellar subluxation is a temporary, partial

dislocation of the patella from the

trochlear groove.


SYNONYMS


Patellar instability


ETIOLOGY


• Acute dislocations can occur with direct

trauma such as a fall or a direct blow to

the knee; however, most occur from a

noncontact mechanism, typically frequent

exposure to the primary mechanism of injury.


• Most

dislocations/subluxations

occur laterally, resulting in

severe disruption of the

extensor mechanism as a

result of the patella sliding

over the lateral portion of the

trochlear groove.



EPIDEMIOLOGY AND

DEMOGRAPHICS


• Acute patellar dislocations account for

2% to 3% of all knee injuries.


• First-time dislocations with a history of prior subluxation are most observed in girls 10 to 17 years of age, but subluxations/dislocations are most often observed in young, athletic individuals.

• Younger children and preadolescents have higher rates of recurrence and

greater underlying mechanical risk factors.

• In those treated nonoperatively after

a one-time dislocation, up to 44% will

dislocate again and >50% will report

symptoms associated with recurrent

instability.

MECHANISM OF INJURY


Dislocation/subluxation most often

results from a noncontact, lower extremity

internal rotation and knee valgus stress

on a fixed distal extremity.


COMMON SIGNS AND

SYMPTOMS

• Patients present with a vague anterior knee

pain and swelling, with complaints of giving

way with specific activities such as jumping

, running, or making quick stops and quick

changes in direction.

• In recurrent instability, symptoms are

typically episodic and long term.

AGGRAVATING ACTIVITIES


• Jumping

• Running

• Quick stops

• Quick changes in direction

Read more :


https://healthretrival.blogspot.com/2022/07/definition-patellar-dislocation-occurs.html


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