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Knee Extensor Mechanism
From WikiSM
(Redirected from Quadriceps Tendon)
Description
- Extensor Mechanism
- Quadriceps tendon inserts into Patella, Patella Tendon in turn attaches to Tibial Tubercle
- Quadriceps Femoris formed by the confluence of 4 muscles into the quadriceps tendon:
- Quadriceps Tendon
- Insertion on the proximal pole of the patella as well as on the dorsal, lateral, and medial surfaces
- Composed of 3 planes: superficial (rectus femoris), middle (vastus medialis and lateralis), deep (vastus intermedius)
- Patellar Tendon
- Distal continuation of quadriceps tendon when it extends past the inferior patellar pole
- Inserts onto tibial tubercle
- Dimensions
- Thickness 4-7 mm (proximal), 5-6 mm (distal)[1]
- Length 4-6 cm
- Width 25-40 mm
- Does not have a well-developed paratenon
- Hoffa fat pad deep to tendon has close relationship to tendon
- "Patellar Ligament"
- Misnomer because the patella is a sesamoid bone
- Embryologically the quadriceps tendon attaches to the tibia
- Mesenchymal condensation develops and becomes the patella
Actions
- Action is to transmit forces from the quadriceps to the proximal tibia
- Efficiency is increased 1.5x because of the presence of the patella[2]
Vascular Supply
- Descending branches of the Lateral Femoral Circumflex Artery
- Descending geniculate
- Medial and lateral superior geniculate artery
Innervation
Clinical Significance
- Patellar Fracture
- Quadriceps Tendon Rupture
- Quadriceps Tendonitis
- Patellar Tendon Rupture
- Patellar Tendonitis
See Also
References
- ↑ el-Khoury GY, Wira RL, Berbaum KS, Pope TL Jr, Monu JU. MR imaging of patellar tendinitis. Radiology 1992;184(3): 849–854
- ↑ Rauh M, Parker R. Patellar and quadriceps tendinopathies and ruptures. In: DeLee JC, ed. DeLee and Drez’s Orthopaedic Sports Medicine. Philadelphia, PA: Saunders; 2009:1513–1577
