✅ Knee MRI Mastery/Chap 3.Collateral Ligaments85 (Fig 3-A.44) O’Donoghue’s Pentad Lesion https://youtu.be/G6zvs91kWgEhttps://youtu.be/GSIg93UH3Oc 📌O'Donoghue's Unhappy TriadThe O'Donoghue unhappy triad refers to a combined injury involving three specific structures: the anterior cruciate ligament (ACL), the medial collateral ligament (MCL), and the medial meniscus.📌Expansion to Tetrad and Pentad LesionsTetrad Lesion: When there is an additional injury to the Medial Patellofemoral .. 2024. 5. 13. (Fig 3-A.43) O'Donoghue’s Triad Lesion https://youtu.be/hlnrlmZ1U_Qhttps://youtu.be/GSIg93UH3Oc 📌 Case study: O'Donoghue's TriadThe O'Donoghue unhappy triad refers to the combined injury of the anterior cruciate ligament (ACL), medial collateral ligament (MCL), and meniscusOriginally described with medial meniscal injury, but lateral meniscal tears more common when ACL and MCL injuries coexistOccurs from contact or non-contact injur.. 2024. 5. 13. (Fig 3-A.42) Oblique Popliteal Ligament Injury https://youtu.be/Dr094F2Y_OQhttps://youtu.be/GSIg93UH3Oc 📌 Injury to the Oblique Popliteal LigamentInjury is usually best seen on axial and sagittal planesDifficult to visualize the intact ligament directlyInferred from injury to the posterior joint capsuleSigns include irregularity, thickening, disruption of the posterior capsule/OPL and surrounding edemaEdema and irregularity of the posterome.. 2024. 5. 13. (Fig 3-A.41) Oblique Popliteal Ligament MRI Anatomy https://youtu.be/k22CIhpyVMshttps://youtu.be/GSIg93UH3Oc 📌Oblique Popliteal LigamentA broad component extends into the OPL, which courses along the posterior capsule of the knee.Laterally, the OPL attaches to the fabella, meniscofemoral portion of the posterolateral joint capsule, and plantaris muscle.On coronal imaging, the OPL appears as an obliquely oriented thick band.While sometimes thin, .. 2024. 5. 13. (Fig 3-A.40) Semimembranosus Tendon and OPL Anatomy https://youtu.be/yyEzqE2Coswhttps://youtu.be/GSIg93UH3Oc 📌 Oblique Popliteal LigamentThe oblique popliteal ligament (OPL) originates medially from the merging of the semimembranosus's lateral expansion and the capsular arm of the popliteus ligament (POL). Laterally, it attaches to the fabella, the meniscofemoral portion of the posterolateral joint capsule, and the plantaris muscle. The OPL, a l.. 2024. 5. 13. (Fig 3-A.39) Fat Accumulation in Semimembranosus Tendon https://youtu.be/TxXjoJqDCNAhttps://youtu.be/GSIg93UH3Oc ✅Fat Accumulation in Semimembranosus Tendon In the semimembranosus tendon, tendinosis is characterized by a thickened tendon and increased signal intensity. However, fat within a normal tendon is considered a normal variant and should not be confused with tendinosis.Radiographics. 2015 Jul-Aug;35(4):1123-37 "Visualizing MSK Radiology: A Pr.. 2024. 5. 12. (Fig 3-A.38) Semimembranosus Tendinopathy: Part 2 https://youtu.be/mqcE9mq-k94https://youtu.be/GSIg93UH3Oc ✅ Semimembranosus Tendon Insertion InjuriesRepetitive Stress Causes Insertion AbnormalitiesInsertional TendinosisDistal Semimembranosus Insertional TendinosisChronic Repetitive Stress Leads to Insertion Changes✅Repetitive Stress Causes Insertion AbnormalitiesRepetitive injury and stress at the insertion site result in irregularity and cyst.. 2024. 5. 12. (Fig 3-A.37) Semimembranosus Tendinopathy: Part 1 https://youtu.be/Vlz0lKGOUcUhttps://youtu.be/GSIg93UH3Oc ✅ Semimembranosus Insertion InjuriesInjuries at the distal semimembranosus insertion are observed in up to 70% of posteromedial corner injuries. These can range from avulsion fractures at its tibial attachment to partial or complete tendon tears, as well as tendinosis. ✅ Pathophysiology of TendinosisTendinosis in this context is often the.. 2024. 5. 12. (Fig 3-A.36) Magic Angle Artifact in Semimembranosus Tendon https://youtu.be/9eTKLkPiK9Ihttps://youtu.be/GSIg93UH3Oc 📌Magic Angle Artifact in MRI ImagingThe magic angle effect occurs due to the specific angulation of the anterior arm of the tendon when the knee is extended. This positioning can result in a focal area of high signal intensity on MRI images.✅ This artifact is most commonly observed in sequences with short echo time (TE), such as:T1-weight.. 2024. 5. 12. (Fig 3-A.35) Semimembranosus Arms with Bursitis: Anterior, Direct, Inferior https://youtu.be/fEW4WagXOs8https://youtu.be/GSIg93UH3Oc 📌 Case study✅Semimembranosus Bursitis OverviewThe semimembranosus bursa, a horseshoe-shaped synovial bursa, is located around the semimembranosus tendon near the posteromedial tibial rim. When inflamed, it forms a synovial-lined space that wraps the tendon, visible as a characteristic reverse 'J' shape on imaging.✅Direct Arm AnatomyThe Di.. 2024. 5. 12. (Fig 3-A.34) Anterior and Direct Semimembranosus Arms https://youtu.be/X4EXbWCrTTMhttps://youtu.be/GSIg93UH3Ochttps://youtu.be/GSIg93UH3Oc 1️⃣Direct Arm (Principal Attachment):Attaches directly to the posteromedial aspect of the tibia, just distal to the joint line, in a groove known as the tuberculum tendinis.Forms a C-shaped, 5-mm-thick band with the anterior arm along the posteromedial tibia, difficult to distinguish from each other.Exhibits hyp.. 2024. 5. 12. (Fig 3-A.33) Five Major Semimembranosus Expansions https://youtu.be/AkCrMM3gSjwhttps://youtu.be/GSIg93UH3Oc 📌Semimembranosus tendon and its five major expansions:1️⃣Direct Arm (Principal Attachment):Attaches directly to the posteromedial aspect of the tibia, just distal to the joint line, in a groove known as the tuberculum tendinis.Forms a C-shaped, 5-mm-thick band with the anterior arm along the posteromedial tibia, difficult to distinguish f.. 2024. 5. 12. (Fig 3-A.32) Grade III Posterior Oblique Ligament Injury https://youtu.be/FueLq9mcIaIhttps://youtu.be/GSIg93UH3Oc 📌 Posteromedial Corner (PMC) Injuries and InstabilityPosteromedial corner injuries are associated with knee instability, which includes anteromedial rotatory instability and genu recurvatum instability.✅ Role of the PMCThe PMC serves as a primary stabilizer against valgus laxity and a secondary stabilizer for anterior tibial translation a.. 2024. 5. 11. (Fig 3-A.31) Grade II Posterior Oblique Ligament Injury_ Part 2 https://youtu.be/lWvCJAv9vpkhttps://youtu.be/GSIg93UH3Oc 📌Posteromedial corner injuryPMC injuries are more commonly associated with other injuries that dominate the clinical picture, which may obscure or mask the presence of PMC injuries.✅Common Associated InjuriesO’Donoghue’s Triad: Involves injuries to the ACL, Medial Collateral Ligament (MCL), and medial meniscus.PCL Injury: Often occurs alo.. 2024. 5. 11. (Fig 3-A.30) Grade II Posterior Oblique Ligament Injury_ Part 1 https://youtu.be/8qzWcaa3ZGMhttps://youtu.be/GSIg93UH3Oc 📌Posterior Oblique Ligament (POL)The POL is functionally distinct from the Medial Collateral Ligament (MCL) and is the most frequently injured structure of the Posteromedial Corner (PMC).✅ Anatomy of the POLThe POL originates proximally just behind and slightly inferior to the proximal origin of the superficial MCL (sMCL). It runs oblique.. 2024. 5. 11. (Fig 3-A.29) Grade I Posterior Oblique Ligament Injury https://youtu.be/fJ2M8jBjZmchttps://youtu.be/GSIg93UH3Oc ✅ Grading System for Posterior Oblique LigamentTearsThe grading system for POL (Posterior Oblique Ligament) tears is identical to that for MCL (Medial Collateral Ligament) tears.1️⃣ Grade I InjuryDefinition: A sprain, or grade I injury, is identified when the ligament maintains normal thickness and continuity, but is surrounded by edema.2️.. 2024. 5. 11. (Fig 3-A.28) Anteromedial Rotatory Instability https://youtu.be/P6KD4DuidKUhttps://youtu.be/GSIg93UH3Oc ✅ Anatomy of the Posteromedial CornerLocated between the superficial medial collateral ligament and posterior cruciate ligamentConsists of 5 main structures: semimembranosus tendon, oblique popliteal ligament, posterior oblique ligament, posteromedial capsule, posterior horn of medial meniscus✅ Biomechanical ImportancePrimary stabilizer ag.. 2024. 5. 10. (Fig 3-A.27) Posteromedial Corner MRI Anatomy, Posterior Oblique Ligament https://youtu.be/WmHsoINz8Uohttps://youtu.be/GSIg93UH3Oc 📌 MRI Anatomy of the Posterior Oblique Ligament✅ Proximal Attachments The posterior oblique ligament (POL) originates near the adductor tubercle from the posterior margin of the superficial medial collateral ligament (sMCL), where the sMCL fuses with the deep medial collateral ligament.Visualization The POL is best visualized on coronal a.. 2024. 5. 10. (Fig 3-A.26) Three arms of the posterior oblique ligament, anatomy https://youtu.be/ufadm4r7kIIhttps://youtu.be/GSIg93UH3Oc 📌Anatomy of the Posterior Oblique Ligament ✅ Origin Originates distal and posterior to adductor tubercle (separate from superficial MCL origin) ✅ Proximal Course Identified posterior to superficial MCL proximally on axial imaging ✅ Distal Attachments Three arms: Capsular arm - blends with posterior capsule and semimembranosus sheathTibial.. 2024. 5. 10. (Fig 3-A.25) Reverse Segond Fracture https://youtu.be/u8e6imw1MOAhttps://youtu.be/GSIg93UH3Oc 📌 Segond FractureAvulsion fracture of anterolateral ligament at tibial insertionAssociated with ACL, MCL, medial meniscus, posterolateral corner injuriesSeen in around 40% of ACL injuriesIndicates anterolateral rotatory instabilityCommonly occurs with sporting injuries📌 Reverse Segond FractureAvulsion of meniscotibial ligament at tibial .. 2024. 5. 9. (Fig 3-A.24) Meniscotibial Ligament Tear_ Part 2 https://youtu.be/lhBTE-fzFbchttps://youtu.be/GSIg93UH3Oc 📌 Case study: Meniscotibial Ligament TearComplete proximal tear of the posterior cruciate ligament (PCL)Tear of the deep medial collateral ligament meniscotibial ligament at its tibial attachmentThickening and increased signal of the meniscofemoral ligamentPosterior root tear of the medial meniscusSuspected entrapment of the short menisco.. 2024. 5. 9. 이전 1 2 3 4 5 다음
