Items tagged “knee”

419 results found
Article

Cyclops lesion (knee)

The cyclops lesion, also known as localized anterior arthrofibrosis, is a painful anterior knee mass that arises as a complication of anterior cruciate ligament (ACL) reconstruction, although has rarely been reported in patients with ACL injuries that have not been reconstructed.  Epidemiology ...
Article

Discoid meniscus

Discoid menisci are anatomical variants 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 are congenital, frequently bilateral (up to 50%) and have been reported in twins, altho...
Article

Double posterior cruciate ligament sign

The double posterior cruciate ligament (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 center of the joint so that it comes to lie anteroinferior to the posterior cruciate ligament (PCL) mimicking a seco...
Article

Extensor mechanism of the knee injuries

Extensor mechanism of the knee injuries can be subdivided into: acute injuries quadriceps muscle tears quadriceps tendon rupture patellar tendon rupture patella fracture patellar dislocation often with medial retinaculum tears patellar sleeve fractures chronic injuries  Osgood-Schlatter...
Article

Lipohemarthrosis

Lipohemarthrosis results from an intra-articular fracture with escape of fat and blood from the bone marrow into the joint, and is most frequently seen in the knee, associated with a tibial plateau fracture or distal femoral fracture; rarely a patellar fracture. They have also been described in ...
Article

Insall-Salvati ratio

The Insall-Salvati ratio or index is the ratio of the patella tendon length to the length of the patella and is used to determine patellar height.  Usage The Insall-Salvati ratio is probably the most commonly used measurement to assess patellar height, partially based on its simplicity. It can...
Article

Meniscal flounce

Meniscal flounces refer to the "ruffled" appearance of the inner margin of knee menisci. They were initially thought to be only an arthroscopic finding, as a result of joint distension and anesthetic muscle relaxants but they are occasionally seen on MRI.  Epidemiology Meniscal flounces are un...
Article

O'Donoghue unhappy triad

O'Donoghue unhappy triad or terrible triad often occurs in contact and non-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 an abduction-external rotation mechanism of injury ("pivot s...
Article

Osgood-Schlatter disease

Osgood-Schlatter disease, also known as apophysitis of the tibial tubercle, is a chronic fatigue injury due to repeated microtrauma at the patellar tendon insertion onto the tibial tuberosity, usually affecting boys between ages 10-15 years. Terminology Unresolved Osgood-Schlatter disease is t...
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 2,4,6: medial condyle: ~78.5% (range 70-85%) "classic" l...
Article

Popliteal artery aneurysm

Popliteal artery aneurysms are the most common peripheral arterial aneurysm and the second most common aneurysm after abdominal aortic aneurysms. Epidemiology Overall, popliteal artery aneurysms are uncommon. They occur almost exclusively in males (up to 97%) for unknown reasons 8-9. There is ...
Article

Quadriceps tendon

The quadriceps tendon is a thick tendon extending to the patella made up of contributions from all four quadriceps muscles. It classically has a trilaminar structure: superficial layer: rectus femoris middle layer: vastus medialis, vastus lateralis deep layer: vastus intermedius It continues...
Article

Rim sign (osteonecrosis)

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

Subchondral insufficiency fracture of the knee

Subchondral insufficiency fracture of the knee (SIF/SIFK) are stress fractures in the femoral condyles or tibial plateau that occur in the absence of acute trauma, typically affecting older adults. Terminology The entity subsumes that previously known as spontaneous osteonecrosis of the knee (...
Case

Avascular necrosis of the knee

  Diagnosis certain
Frank Gaillard
Published 07 May 2008
78% complete
MRI Annotated image
Case

Discoid meniscus - degenerative

  Diagnosis certain
Frank Gaillard
Published 07 May 2008
59% complete
MRI
Case

Degenerative subchondral bone cyst

  Diagnosis almost certain
Frank Gaillard
Published 13 May 2008
59% complete
MRI X-ray
Case

Knee joint effusion

  Diagnosis certain
Frank Gaillard
Published 15 May 2008
66% complete
X-ray
Case

Celery stalk sign in ACL mucoid degeneration

  Diagnosis almost certain
Frank Gaillard
Published 27 May 2008
46% complete
Diagram MRI
Case

Anterior cruciate ligament ganglion cyst

  Diagnosis certain
Frank Gaillard
Published 27 May 2008
80% complete
MRI

Updating… Please wait.

 Unable to process the form. Check for errors and try again.

 Thank you for updating your details.