Ver el código de «Patella dislocation»

==Background==
*Occurs with trauma to an extended knee with externally rotated foot and twisting motion<ref>Review of Orthopaedics, 6th Edition, Mark D. Miller MD, Stephen R. Thompson MBBS MEd FRCSC, Jennifer Hart MPAS PA-C ATC, an imprint of Elsevier, Philadelphia, Copyright 2012</ref>
*Acute: in traumatic injury, occurs equally in men/women <ref name="epi">Fithian DC, Paxton EW, Stone ML, Silva P, Davis DK, Elias DA, White LM. Epidemiology and natural history of acute patellar dislocation. AJSM 2004;32:1114-1121</ref>
*Chronic: women/teenage girls<ref name="epi"></ref>
*Commonly lateral displacement and unable to extend knee

==Clinical Features==
[[File:Patellar dislocation.jpg|thumb|patella dislocates laterally]]
*Patella is usually displaced laterally; knee is held in flexion
*Acute: often with large hemarthrosis
*Chronic: little to no swelling

==Differential Diagnosis==
{{Knee DDX}}

==Evaluation==
[[File:Patellaluxation ap 001.png|thumb]]
*Xray if traumatic mechanism to rule out fracture
*Do not need xay prior to reduction if chronic
*Post-reduction x-ray: confirm reduction, eval for fractures and loose bodies (avulsions, misalignment, etc)<ref>Krause E A. et al. Pediatric lateral patellar dislocation: is there a role for plain radiography in the emergency department? J Emerg Med. 2013 Jun;44(6):1126-31</ref>
*Common associated fractures
**Medial patella facet
**Lateral femoral condyle

==Management==
[[File:Patellar Dislocation Relocation.jpg|thumb|Relocation with lateral pressure on dislocated patella]]
*Reduce; do not need x-rays prior to reduction
**Mild flexion of hip (20-30 degrees) to relax quadriceps
**Extend and slightly hyperextend the knee and slide patella back into place
**Knee immobilizer, NSAIDs, partial weight-bearing
**Orthopedic follow-up within 1-2wks
*Unable to reduce or loose bodies/fracture on post-reduction imaging
**Obtain immediate ortho consult

==Disposition==

==References==
<references/>

==See Also==
[[Knee (Main)]]

[[Category:Orthopedics]]