Patella Dislocation

Last updated 20.05.13

 

Definition

-  Dislocation of the patella

 

Features

-  Patella dislocates laterally & may reduce spontaneously

 

Cause

-   

 

Associated S/S

-  Pain

-  Severe pain

-  Sensation of popping in knee joint with instability

-  Knee examination

-  Swelling, erythema, warmth

-  Tense haemarthrosis

-  Medial patella facet tenderness

-  Patella Aprehension Test: 39% sensitivity

 

DDx

-   

 

Grades

-   

 

Ix

-  X-Ray

-  Exclude patella fracture

-  Loose body

 

Mx

-  Physiotherapy

-  Vastus medialis strengthening to prevent recurrence

-  Surgery: arthroscopy

-  Indicated if loose body, large fracture, painful haemarthrosis

 

 

 

References

 

Sports Knee Injuries: Assessment & Mangement, AFP Vol 39, No 1/1 2010