Items tagged “knee”

357 results found
Article

O'Donoghue unhappy triad

O'Donoghue unhappy triad or terrible triad often occurs in contact sports, such as basketball, football, or rugby, when there is a lateral force applied to the knee while the foot is fixated on the ground. This produces the "pivot shift" mechanism. The O'Donoghue unhappy triad comprises three t...
Case

Degenerative subchondral bone cyst

 Diagnosis almost certain
A.Prof Frank Gaillard
Published 13 May 2008
64% complete
MRIX-ray
Case

Avascular necrosis of the knee

 Diagnosis certain
A.Prof Frank Gaillard
Published 07 May 2008
83% complete
MRIAnnotated image
Case

Discoid meniscus (degenerate)

 Diagnosis certain
A.Prof Frank Gaillard
Published 07 May 2008
68% complete
MRI
Case

Knee joint effusion

 Diagnosis certain
A.Prof Frank Gaillard
Published 15 May 2008
69% complete
X-ray
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 fibres are separated from each other by higher signal mucinous material, best appreciated ...
Case

Sinding-Larsen-Johansson syndrome

Sinding-Larsen-Jo...
 Diagnosis almost certain
Dr Michael Sargent
Published 06 Jun 2009
50% complete
X-rayMRI
Article

Osteochondritis dissecans of the knee

Osteochondritis dissecans (OCD) most commonly affects the knee. See osteochondritis dissecans article for a general discussion. Pathology Location The condition occurs bilaterally in 25% of cases, and has a characteristic distribution: medial condyle: 85% 2,4 "classic" lateral surface of th...
Case

Insall-Salvati ratio - normal patella

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

Normal patella - sag T2 FS

Normal patella
 Diagnosis not applicable
A.Prof Frank Gaillard
Published 10 Sep 2009
30% complete
MRI
Case

Chronic patellar tendinosis: Jumper's knee

Patellar tendinos...
 Diagnosis almost certain
Dr Natalie Yang
Published 14 Sep 2009
59% complete
MRI
Case

Spontaneous osteonecrosis of the knee

SONK PD

SONK of ...
 Diagnosis almost certain
Dr Natalie Yang
Published 14 Sep 2009
71% complete
MRIX-ray
Article

Double PCL sign

The double PCL sign appears on sagittal MRI images of the knee when a bucket-handle meniscal tear (medial meniscus in 80% of cases) flips towards the centre of the joint so that it comes to lie anteroinferior to the posterior cruciate ligament (PCL) mimicking a second smaller PCL. A double PCL ...
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 bow-tie-shaped structures between the femoral condyles and tibial plateaux. As the n...
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 stabilise the knee joint.  Gross anatomy The PCL attaches to the posterior intercondylar area and passes anterosuperiorly to insert into the lateral surface of the medial femoral condyle.  When the knee is in exte...
Article

Rim sign of avascular necrosis

The rim sign comprises a high T2 or intermediate T1 signal line sandwiched between two low signal lines, and represents fluid between sclerotic borders of an osteochondral fragment, and implies instability (stage III). The rim sign should not be confused with the double line sign of osteonecros...
Article

Meniscal flounce

Meniscal flounces refers to the "ruffled" appearance of the inner margin of the knee meniscus. They were initially thought to be only an arthroscopic finding, as a result of joint distension and anaesthetic muscle relaxants but are rarely seen on MRI.  Epidemiology Meniscal flounces are rare, ...
Article

Discoid meniscus

Discoid menisci are those that have a body that is too wide, usually affecting the lateral meniscus. They are incidentally found in 3-5% of knee MRI examinations. Epidemiology Discoid menisci condition is congenital, frequently bilateral (up to 50%) and has been reported in twins, although no ...
Case

Bucket handle tear - lateral meniscus

 Diagnosis certain
A.Prof Frank Gaillard
Published 22 Sep 2009
71% complete
MRI

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