Patellar Dislocation (Subscribe)  

Conclusions The Roux-Elmslie-Trillat procedure could be recommended in cases presenting with an increased q-angle, trochlea dysplasia or failed soft tissue surgery. In the present study the majority of patients report a return to previous sporting activity ten years after surgery.
A 10 year follow-up study after Roux-Elmslie-Trillat treatment for cases of patellar...

PATELLAR DISLOCATIONS:
* Most commonly due to twisting injury to knee.
* Only 10 % caused by direct trauma
* 24% incidence of positive family history of patellar dislocation
* Risk factors include:
  1. Shallow patellofemoral articular groove
  2. Patella alta
  3. Excessive Q angle
  4. Generalized ligamentous laxity
* Average age is 16- 20...

- patella alta refers to an abnormally high patella in relation to femur;
- may result in Subluxation and dislocation of patella;
Wheeless' Textbook of Orthopaedics

* most common in young girls
o (genu valgum, patella alta, quad mm deficiency more in girls)
* LATERAL dislocation
* spontaneous reduction
* recurrent dislocation
* fracture associated in 5-10%
* MRI: bone bruise of lateral femur and medial patella

- Q angle is the angle formed by a line drawn from the ASIS to central patella and a second line drawn from central patella to tibial tubercle;
- an increased Q angle is a risk factor for patellar subluxation;
- normally Q angle...

- patient characteristics:
- patellar subluxation or dislocation may occur during childhood but is more frequently seen in adolescence;
- in some cases, dislocation occurs in knees w/ patellofemoral dysplasia,...