Items tagged “knee”

419 results found
Article

Anterior cruciate ligament mucoid degeneration

Anterior cruciate ligament (ACL) mucoid degeneration, along with tears and anterior cruciate ligament ganglion cysts, is a relatively common cause of increased signal within the anterior cruciate ligament (ACL). The appearance can mimic acute or chronic interstitial partial tears of the ACL. How...
Article

Anterior cruciate ligament ganglion cyst

Anterior cruciate ligament (ACL) ganglion cysts, commonly referred to simply as ACL cysts, along with ganglion cysts arising from the alar folds that cover the infrapatellar fat pad, make up the vast majority of intra-articular ganglion cysts of the knee. Epidemiology Anterior cruciate ligamen...
Article

Celery stalk sign (anterior cruciate ligament)

The celery stalk sign is a term given to the appearance of the anterior cruciate ligament which has undergone mucoid degeneration and has been likened to that of a celery stalk. Its low signal longitudinal fibers are separated from each other by higher signal mucinous material, best appreciated ...
Case

Sinding-Larsen-Johansson disease

  Diagnosis almost certain
Michael Sargent
Published 06 Jun 2009
58% complete
MRI X-ray
Case

Lipohemarthrosis

  Diagnosis certain
Jeremy Jones
Published 23 Aug 2009
69% complete
X-ray Annotated image
Article

Pellegrini-Stieda lesion

Pellegrini-Stieda lesions refer to ossified post-traumatic lesions at (or near) the medial femoral collateral ligament adjacent to the margin of the medial femoral condyle. One presumed mechanism of injury is a Stieda fracture (avulsion injury of the medial collateral ligament at the medial femo...
Case

Insall-Salvati ratio - normal patella

  Diagnosis not applicable
Frank Gaillard
Published 10 Sep 2009
39% complete
MRI
Case

Normal Insall-Salvati ratio (annotated image)

  Diagnosis not applicable
Frank Gaillard
Published 10 Sep 2009
24% complete
MRI
Case

Chronic patellar tendinosis - Jumper's knee

  Diagnosis almost certain
Natalie Yang
Published 14 Sep 2009
59% complete
MRI
Case

Spontaneous osteonecrosis of the knee

  Diagnosis almost certain
Natalie Yang
Published 14 Sep 2009
64% complete
X-ray MRI
Article

Absent bow tie sign (knee)

The absent bow tie sign represents the loss of the normal appearance of the menisci on parasagittal MRI images and is suggestive of meniscal injury. Normally the medial and lateral menisci appear as low signal triangular structures linked by a thin body located between the femoral condyles and ...
Article

Fragment-in-notch sign (knee)

The fragment-in-notch sign is closely related to, can be thought of as a failed, double PCL sign, in so far as it represents a meniscal fragment lying in the intercondylar notch, but not paralleling the posterior cruciate ligament (PCL).  Although both signs are most frequently seen in the sett...
Article

Posterior cruciate ligament

The posterior cruciate ligament (PCL) is one of the two cruciate ligaments that stabilize the knee joint.  Gross anatomy The posterior cruciate ligament arises from the lateral surface of the medial femoral condyle and inserts onto the posterior lateral intercondylar surface of the tibial plat...
Case

Bucket handle tear - lateral meniscus

  Diagnosis certain
Frank Gaillard
Published 22 Sep 2009
74% complete
MRI
Case

Lateral patellar dislocation

  Diagnosis certain
Frank Gaillard
Published 23 Sep 2009
74% complete
MRI
Case

Patellar dislocation

  Diagnosis certain
Frank Gaillard
Published 22 Oct 2009
53% complete
MRI
Case

Ossified subperiosteal hematoma - femur

  Diagnosis almost certain
Frank Gaillard
Published 03 Nov 2009
41% complete
X-ray
Case

Giant cell tumor - atypical

  Diagnosis certain
Frank Gaillard
Published 04 Nov 2009
84% complete
CT X-ray MRI
Article

Patella baja

Patella baja, also known as patella infera, is an abnormally low lying patella, which is associated with restricted range of motion, crepitations, and retropatellar pain. If longstanding, extensor dysfunction may ensue with significant morbidity. Pathology It is seen in a variety of clinical s...
Article

Blackburne-Peel ratio

The Blackburne-Peel ratio is an alternative to Insall-Salvati ratio and is used to assess patellar height including patella alta and baja.  Usage The Blackburne-Peel ratio has higher interobserver reliability compared to the Insall-Salvati ratio and can also be used when the tibial tuberosity ...

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