At surgery, 32 knees had an intact ACL, 4 a partial tear, and 55 a complete ACL tear. Purpose: To describe 2 MRI signs of partial ACL tear involving the posterolateral bundle on conventional knee MRI sequences, specifically, the "gap" and "footprint" signs. MRI findings of anterior cruciate ligament (ACL) tears and associated injuries are well documented in the adult knee [1, 2].In the past, injuries to the ACL were thought to be uncommon in children. Obtaining an MRI to look at the other structures in the knee may or may not be necessary. Using axial MRI, the authors were able to segregate stable ACLs (normal ligaments and stable partial tears) from unstable ACLs (unstable partial tears and complete tears) with 100% sensitivity and 96% specificity. Check the positioning block in the other two planes. Plan the sagittal oblique slices on the axial plane, angle the position block parallel to the ACL. The anterior cruciate ligament (ACL) is an important stabilizer of knee motion. ACL tears happen when the anterior cruciate ligament is either stretched, partially torn, or completely torn. 24,9 Although posterior root tears of the lateral meniscus can present as an isolated partial tear or avulsion, they commonly involve the adjacent posterior horn of the lateral meniscus. An appropriate angle must be given in the coronal plane parallel to the ACL. Background: Diagnosis of partial anterior cruciate ligament (ACL) tears is difficult on magnetic resonance imaging (MRI), particularly the isolated tears of the posterolateral bundle. In this video, Minnesota knee surgeon Dr. LaPrade identifies how to read an MRI of an ACL tear. Roychowdhury et al 8 determined the usefulness of axial MRI for diagnosing partial ACL tears. Results. He looks at the normal anatomy of the knee and what a torn ACL looks like and the secondary signs of an anterior cruciate ligament injury. The addition of oblique axial imaging, increased sensitivity for ACL lesions (as a whole) from 74% to 95% and the accuracy … http://drrobertlaprademd.com/In this video, Dr. LaPrade identifies how to read knee MRI of ACL tear. The ACL was classified as intact, partially, or completely torn. Injury of the ACL can lead to substantial disability; an accurate diagnosis of ACL injury is vital in both short-term and long-term patient care. Live. •. PD fat sat sagittal oblique 2mm for ACL . Given that surgical treatment depends on the grade of injury, it is worthwhile to stratify ACL injuries as stable (normal ligament or stable partial tears) or unstable (unstable partial or complete tears) based on MR imaging ( Fig. To investigate the diagnostic accuracy of oblique axial intermediate weighting MR imaging in detecting partial thickness anterior cruciate ligament (ACL) bundle tears. The study protocol was approved by the institutional ethics committee. A recent increase in the frequency of diagnosis [3, 4] raises concerns regarding the management of ACL tears and associated injuries in skeletally immature patients. Posterior root tears of the lateral meniscus occur in 8% – 9.8% of patients with an ACL tear and rarely occur in the absence of an ACL tear. The most common injury is a complete tear. In all patients, axial, sagittal, coronal, and paracoronal T2-weighted turbo-SE images were acquired. Symptoms include pain, a popping sound during injury, instability of the knee, and joint swelling. Partial and complete tears were combined for statistical evaluation. Sixty-one subjects (43 male, 18 female; mean age 27.4 years; range 9 to 57 years) with clinically suspected ACL tear or meniscal tear … He wrote, “If the ACL tests clearly suggest an ACL injury, then an MRI isn’t always needed. 14 ). Slices must be sufficient to cover the ACL. The surgeon does look at the other structures in the knee arthroscopically when performing the ACL reconstruction.” The comparative study was done using MRI protocol A versus protocol B for isolated anteromedial and posterolateral bundle as well as for ACL lesions as a whole with comparing these findings with arthroscopy as the gold standard.
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