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📌 Overview of Quadriceps Tendon:
The quadriceps tendon has a unique laminated appearance on sagittal MR images, with low-signal intensity bands separated by linear fat.
It can appear in different configurations: trilaminar (56%), bilaminar (30%), or quadrilaminar (8% )
1️⃣ Most Superficial Layer:
- Originates from the rectus femoris muscle.
2️⃣ Intermediate Layer:
- Formed by the fusion of the tendons of the vastus lateralis and vastus medialis.
- Attaches to the anterosuperior surface of the proximal patella, posterior to the rectus femoris insertion.
- Vastus lateralis tendon is anterior to vastus medialis tendon in the thigh, converging at the patella【RadioGraphics 2018; 38:2069–2101】.
3️⃣ Deepest Layer:
- Comprised of the vastus intermedius tendon, which inserts into the anterosuperior surface of the patella.
✅ Additional Structures:
1️⃣ Tensor of Vastus Intermedius (TVI):
- Newly discovered muscle in the intermediate layer.
- Located between the vastus lateralis and vastus intermedius.
- Merges with a broad, flat aponeurosis before attaching to the medial patella.
2️⃣ Prepatellar Quadriceps Continuation:
- Consists of rectus femoris tendon fibers connecting the quadriceps and patellar tendons.
- Very thin and adherent to the patella, making differentiation from the patellar cortex challenging.
3️⃣ Articularis Genus (Articular Muscle of the Knee):
- Originates from the distal femur.
- Seen on sagittal MR imaging in most patients.
- Stabilizes the suprapatellar recess and joint capsule during extension.
- Deepest component of the extensor mechanism, inserting on the suprapatellar pouch
References:
- RadioGraphics 2018; 38:2069–2101
- Magn Reson Imaging Clin N Am 22 (2014) 601–620
- Knee Surg Sports Traumatol Arthrosc. 2018 Mar;26(3):727-738
- Knee Surg Sports Traumatol Arthrosc. 2018 Mar;26(3):727-738
- AJR 2009; 192:W111–W116
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#QuadricepsTendon, #SagittalMRI, #MusculoskeletalImaging, #RectusFemoris, #VastusLateralis, #VastusMedialis, #VastusIntermedius, #TensorVastusIntermedius, #PrepatellarQuadriceps, #ArticularisGenus
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