Posterior capsular tears

http://musculoskeletalmri.blogspot.com.au/2011/12/charlie-brown-and-knee-injury.html

Scenario: Hyperextension, "pop", intact cruciates, posterior capsular tear

Roof Impingement

 

Oblique menisco-meniscal ligament

 

 

Not to be mistaken for Double PCL sign. Note incidental ACL rupture.

Partial ACL Tear

 

 

 Reference: Radsource MRI Web Clinic March 2006

ACL Interstitial Injury

Anterior Tibial Translation Sign in ACL Tear

Criteria:

Saggital MRI of lateral femoral condyle -

Draw vertical lines tangent to the posterior margins of the lateral femoral condyle and tibia -

7-mm or greater anterior translocation of the tibia relative to the femur.

Reference: June 2006 Radiology, 239, 914-915.

Double Delta Sign and Deep Lateral Sulcus Sign

Bucket Handle Tear Lateral Meniscus. Chronic ACL Tear

Deep Lateral Sulcus Sign (Deep Femoral Notch Sign) and ACL Tear

Strictly a plain film sign, the deep lateral femoral notch (sulcus) sign is a secondary sign of an ACL tear (rotational and valgus force).

The Lateral Femoral Notch Sign -- June 2001 Radiology, 219, 800-801.

http://radiology.rsna.org/content/219/3/800.full

Subtle Wrisberg Rip (in setting of ACL tear)

ACL Tear and Wrisberg Rip

Wrisberg Rip:

The Wrisberg Rip is a characteristic longitudinal tear of the posterior horn of the lateral meniscus that may be seen in association with ACL tears. This tear type is important for two reasons. First, many people realize that meniscal tears are common in association with ACL disruption, but tears at the central portion of the posterior horn laterally are among the most frequently missed. The Wrisberg Rip is one of those tears. Second, because the Wrisberg Rip appears to occur only in association with ACL tears, this tear pattern may be used as a secondary sign of ACL disruption.

http://www.radsource.us/clinic/0310

PCL Rupture and Vertical Tear LM

ACL - Chronic Interstitial Tear

Tibial Avulsion Fracture in Child

A 9 year old with an avulsion fracture at the ACL insertion and a Salter Harris type III lateral tibial fracute. Tibial avulsion fractures are more common that ACL tears in under 12's. The anterior intercondylar eminence fracture is analogous to an injury to the ACL in the skeletally mature individual.
Radiology. 1999;213:697-704
AJR 2005; 185:756-762

ACL Rupture and Grade III MCL Tear