[膝关节MRI]结构的功能解剖学和MR成像损伤评估（可编辑）

[膝关节MRI]结构的功能解剖学和MR成像损伤评估（可编辑） [膝关节MRI]结构的功能解剖学和MR成像损伤评估 SCIENTIFIC EXHIBIT S91 Lateral Stabilizing Structures of the Knee Functional Anatomy and Injuries Assessed with MR Imaging1 Jose A Recondo MD Emma Salvador MD Jorge A Villanúa MD Mari C Barrera MD Cristina Gervás MD Jose M Alústiza MD The lateral aspect of the knee is stabilized by a complex arrangement of ligaments tendons and muscles These structures can be demonstrated with routine spin-echo magnetic resonance MR imaging sequences performed in the sagittal coronal and axial planes Anterolateral sta- bilization is provided by the capsule and iliotibial tract Posterolateral stabilization is provided by the arcuate ligament complex which com- prises the lateral collateral ligament biceps femoris tendon popliteus muscle and tendon popliteal meniscal and popliteal fibular ligaments oblique popliteal arcuate and fabellofibular ligaments and lateral gas- trocnemius muscle Injuries to lateral knee structures are less common than injuries to medial knee structures but may be more disabling Most lateral compartment injuries are associated with damage to the cruci- ate ligaments and medial knee structures Moreover such injuries are frequently overlooked at clinical examination Structures of the antero- lateral quadrant are the most frequently injured posterolateral instabil- ity is considerably less common Practically all tears of the lateral col- lateral ligament are associated with damage to posterolateral knee struc- tures Most injuries of the popliteus muscle and tendon are associated with damage to other knee structures MR imaging can demonstrate these injuries Familiarity with the musculotendinous anatomy of the knee will facilitate accurate diagnosis with MR imaging Index terms Knee anatomy 452121411 45292 Knee injuries 452485 Knee ligaments menisci and cartilage 452485 45292 RadioGraphics 2000 20S91–S102 1From the Department of Magnetic Resonance Osatek Hospital Aránzazu Complejo Hospitalario Donostia Paseo Doctor Beguiristain 109 20014 San Sebastián Spain Presented as a scientific exhibit at the 1999 RSNA scientific assembly Received February 1 2000 revision re- quested February 23 and received March 17 accepted April 11 Address correspondence to com e-mail rmdonostiaosatekes RSNA 2000 S92 October 2000 RG Volume 20 Special Issue Introduction The lateral compartment of the knee contains many ligamentous and tendinous structures which are the primary restraint against varus an- gulation as well as external-internal rotation and anterior-posterior translation of the tibia 1–5 Isolated damage to these structures is rare injuries are frequently interlaced and combined with cruciate ligament tears or damage to the sta- bilizing structures of the medial side of the knee 4–8 Although lateral compartment lesions are less common than those on the medial side of the joint they may be more disabling The wide range and complexity of these injuries cause difficulties in clinical diagnosis and some damaged struc- tures may go undetected at clinical examination In fact clinically unrecognized posterolateral in- juries have been suggested as a cause of chronic instability of the knee after trauma and postsurgi-