RT Book, Section
A1 Kling, Mark P.
A2 Reichman, Eric F.
SR Print(0)
ID 1159801796
T1 Patellar Dislocation Reduction
T2 Reichman's Emergency Medicine Procedures, 3e
YR 2018
FD 2018
PB McGraw-Hill Education
PP New York, NY
SN 9781259861925
LK accessemergencymedicine.mhmedical.com/content.aspx?aid=1159801796
RD 2024/04/19
AB Dislocation  of  the  patella  generally  results  from  a  traumatic  event.1,2  It  is  most  commonly  due  to  a  direct  blow  to  the  flexed  knee.  It  may  also  occur  from  a  forceful  quadriceps  contraction  while  the  femur  is  internally  rotated  on  the  tibia  with  the  foot  planted  (e.g.,  baseball,  football,  and  soccer).  Many  patients  may  not  notice  the  dislocation  as  it  may  spontaneously  reduce  immediately  after  the  injury.  There  are  numerous  theories  as  to  the  predisposition  to  a  patella  dislocation  (e.g.,  adolescents,  age  10  to  30,  anteverted  femur,  contracted  iliotibial  groove,  excessive  patellar  lateral  tilt,  family  history  of  patella  dislocation,  females,  flat  intercondylar  groove,  joint  laxity,  “knock-knees”  or  genu  valgus,  hypoplastic  femoral  condyle,  large  Q-angles,  ligamentous  laxity,  obesity,  patella  alta,  patellar  hypermobility,  physical  activity,  shallow  intercondylar  groove,  and  vastus  medialis  muscle  atrophy).3-6  This  condition  is  most  commonly  seen  in  adolescents  and  females.7,8