Articular muscle of the knee: a muscle seldom recognized on MR imaging.

Puig, Stefan; Dupuy, Damian E.; Sarmiento, Alberto Martínez; Boland, Giles W.; Grigoris, P.; Greene, Richard M.

doi:10.2214/ajr.166.5.8615242

Cited by 17 publications

(22 citation statements)

References 5 publications

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“…These synovial-lined surfaces articulate with the trochlea during knee flexion; this process increases congruency of the extensor mechanism [5]. An additional anterior knee structure, the articular muscle, is found deep relative to the quadriceps muscle, is present in all individuals, and is routinely visualized on MR images [9]. It originates from the femur as one to seven muscle bundles and inserts on the suprapatellar recess, where it applies tension to the suprapatellar recess during knee extension, protecting the relatively redundant suprapatellar recess from entrapment between the femur and the patella [9].…”

Section: Discussionmentioning

confidence: 99%

Quadriceps Fat Pad Signal Intensity and Enlargement on MRI: Prevalence and Associated Findings

Roth

Jacobson

Jamadar

et al. 2004

American Journal of Roentgenology

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Section: Discussionmentioning

confidence: 99%

Quadriceps Fat Pad Signal Intensity and Enlargement on MRI: Prevalence and Associated Findings

Roth

Jacobson

Jamadar

et al. 2004

American Journal of Roentgenology

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“…4). 13,14 The extensor mechanism does not have a paratenon. 7 The genicular arteries provide blood supply to the patella and secondarily to the quadriceps and patellar tendons.…”

Section: Normal Anatomymentioning

confidence: 99%

Magnetic Resonance Imaging of the Extensor Mechanism

Yablon¹,

Pai²,

Dong³

et al. 2014

Magnetic Resonance Imaging Clinics of North America

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“…It originates from the anterior aspect of the distal femur and extends inferomedially to insert near the suprapatellar bursa (figure 3). In a 1995 retrospective study, the articular muscle of the knee could be seen in 83% of clinical MRI studies of the knee 4. It should not be mistaken for a soft tissue mass.…”

Section: Anatomical Variantsmentioning

confidence: 98%

Get a kick out of this: the spectrum of knee extensor mechanism injuries

Tuong

White²,

Louis³

et al. 2010

Br J Sports Med

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At the end of this article, the reader should be able to (1) recognise normal anatomy and anatomical variants of the extensor mechanism of the knee on various imaging modalities, including plain film, ultrasound and MRI; (2) diagnose a broad spectrum of EM injuries in adult and paediatric patients including patellar and quadriceps tendinopathy, Osgood-Schlatter disease, Sindig-Larsen-Johansson syndrome, chondromalacia patellae and patellar fractures on various imaging modalities; and (3) appreciate the important role of imaging in the diagnosis of musculoskeletal injuries. INTRODUCTIONThe extensor mechanism (EM) of the knee comprises the quadriceps muscles and tendon, the patella, patellar tendon and supporting retinaculum ( fi gure 1 ). Injuries of the EM are common and may be due to acute trauma, overuse injuries or chronic degenerative disease, and imaging plays an important role in diagnosis. In addition to clinical evaluation, abnormalities of bone and soft tissues can be visualised with plain fi lms and CT, and tendons can be assessed with ultrasound (US). MRI provides excellent evaluation of the knee and is often the imaging modality of choice in the characterisation of EM injuries. ANATOMY OF THE EM OF THE KNEEThe EM of the knee comprises the quadriceps muscles and tendon, the patella, the patellar tendon and supporting retinacula. The quadriceps muscles include the rectus femoris and the vastus lateralis, vastus intermedius and vastus medialis. The origin of the rectus femoris is the anterior inferior iliac spine, and the vastus muscles originate from the femoral shaft. The quadriceps tendon inserts on the superior pole of the patella and usually has a trilaminar appearance on MR. 1 The superfi cial lamina is composed of the rectus femoris, the intermediate lamina is composed of the vastus lateralis and medialis, and lastly the deep lamina is formed by the vastus intermedius.The patella is the largest sesamoid bone in the body and articulates with the trochlear groove of the femur. It usually possesses a median ridge that divides the proximal patella into medial and lateral facets, and the medial facet is generally smaller. The patellar tendon is mainly composed of rectus femoris fi bres that course over the patella and originates at the superior pole of the patella and inserts on the tibial tuberosity.The medial retinaculum has three components: the superior component is composed of the vastus medialis and patellofemoral ligament, the midportion is composed of the medial collateral ligament fi bres, and lastly the inferior component includes the patellotibial ligament and the medial patellomeniscal ligament. Similarly, the lateral retinaculum is composed of three parts: the superfi cial component includes the iliotibial tract and biceps femoris, the midportion is composed of the vastus lateralis, and the deep component is composed by the joint capsule.Additional soft tissue structures includes fat pads, namely the anterior suprapatellar (quadriceps) fat pad, the posterior suprapatellar (prefemo...

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Articular muscle of the knee: a muscle seldom recognized on MR imaging.

Abstract: OBJECTIVE.We studied the MR imaging characteristics of the articular muscle of the knee, an important but seldom recognized structure of the distal thigh and knee. SUBJECTS AND METHODS. We used a 1 .5-T system to prospectively evaluate the

Cited by 17 publications

References 5 publications

Quadriceps Fat Pad Signal Intensity and Enlargement on MRI: Prevalence and Associated Findings

Quadriceps Fat Pad Signal Intensity and Enlargement on MRI: Prevalence and Associated Findings

Magnetic Resonance Imaging of the Extensor Mechanism

Get a kick out of this: the spectrum of knee extensor mechanism injuries

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