Difference between revisions of "X-ray of patellar dislocation and subluxation"
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In borderline cases of subluxation, preferably apply the following measurements: | In borderline cases of subluxation, preferably apply the following measurements: | ||
*The '''lateral patellofemoral angle''', formed by:<ref name="SagginSaggin2012">{{cite journal|last1=Saggin|first1=Paulo Renato Fernandes|last2=Saggin|first2=Jose Idílio|last3=Dejour|first3=David|title=Imaging in Patellofemoral Instability|journal=Sports Medicine and Arthroscopy Review|volume=20|issue=3|year=2012|pages=145–151|issn=1062-8592|doi=10.1097/JSA.0b013e3182553cfe}}</ref> | *The '''lateral patellofemoral angle''', formed by:<ref name="SagginSaggin2012">{{cite journal|last1=Saggin|first1=Paulo Renato Fernandes|last2=Saggin|first2=Jose Idílio|last3=Dejour|first3=David|title=Imaging in Patellofemoral Instability|journal=Sports Medicine and Arthroscopy Review|volume=20|issue=3|year=2012|pages=145–151|issn=1062-8592|doi=10.1097/JSA.0b013e3182553cfe}}</ref> | ||
| − | :*A line connecting the most anterior points of the medial and lateral facets of the trochlea | + | :*A line connecting the most anterior points of the medial and lateral facets of the trochlea. |
| + | :*A tangent to the lateral facet of the patella. | ||
:With the knee in 20° flexed, this angle should normally open laterally.<ref name="SagginSaggin2012"/> | :With the knee in 20° flexed, this angle should normally open laterally.<ref name="SagginSaggin2012"/> | ||
*The '''patellofemoral index''' is the ratio between the thickness of the medial joint space and the lateral joint space (L). With the knee 20° flexed, it should measure 1.6 or less. | *The '''patellofemoral index''' is the ratio between the thickness of the medial joint space and the lateral joint space (L). With the knee 20° flexed, it should measure 1.6 or less. | ||
Revision as of 19:43, 31 July 2019
Author:
Mikael Häggström [notes 1]
Evaluation
In obvious patellar dislocation, make a rough estimation of the distance compared to normal position.
In borderline cases of subluxation, preferably apply the following measurements:
- The lateral patellofemoral angle, formed by:[1]
- A line connecting the most anterior points of the medial and lateral facets of the trochlea.
- A tangent to the lateral facet of the patella.
- With the knee in 20° flexed, this angle should normally open laterally.[1]
- The patellofemoral index is the ratio between the thickness of the medial joint space and the lateral joint space (L). With the knee 20° flexed, it should measure 1.6 or less.
Also, look for any resultant fractures of the patella.
Notes
- ↑ For a full list of contributors, see article history. Creators of images are attributed at the image description pages, seen by clicking on the images. See Radlines:Authorship for details.
