Intra-articular dislocation of the patella: two cases and literature review

J Trauma. 1999 Oct;47(4):780-3. doi: 10.1097/00005373-199910000-00030.


Intra-articular dislocation of the patella remains uncommon and is generally thought to be a problem of young adolescent males. This report reminds emergency physicians that it can occur in the arthritic knee, and it should be considered in the differential diagnosis of locked knee in the elderly. Closed reduction should be attempted in these cases, because the dislocation is liable to be held in place by osteophytes rather than impaction of the patella deep in the intercondylar notch and a good functional outcome can be expected.

Publication types

  • Case Reports
  • Review

MeSH terms

  • Age Distribution
  • Aged
  • Aged, 80 and over
  • Biomechanical Phenomena
  • Diagnosis, Differential
  • Female
  • Humans
  • Joint Dislocations / diagnostic imaging*
  • Joint Dislocations / etiology
  • Joint Dislocations / therapy
  • Knee Injuries / diagnostic imaging*
  • Knee Injuries / etiology
  • Knee Injuries / therapy
  • Male
  • Manipulation, Orthopedic
  • Middle Aged
  • Osteoarthritis, Knee / complications
  • Patella / injuries*
  • Radiography
  • Range of Motion, Articular
  • Risk Factors