Knee Extensors
Original Editor - Lucinda hampton
Top Contributors - Lucinda hampton and Aminat Abolade
Introduction[edit | edit source]
The knee extensors play an essential role in human movement. The one muscle that extends the knee is the massive quadriceps. Knee extension ROM is from full flexion to 5-10° hyperextension. The iliotibial tracts (ITB) and tensor fascia latae (TFL) also play a role in knee extension[1].
Extensors[edit | edit source]
The quadriceps femoris consists of four individual muscles, three of the heads arise from the femur, the vastus intermedius, vastus medialis, and vastus lateralis. The fourth head, rectus femoris, arises from the hip bone. All four heads converge on the quadriceps tendon. They form the main bulk of the thigh, and collectively are one of the most powerful muscles in the body.[2] The quadriceps in the agonist of knee extension[3]. Synergists include:
- The ITB: an extensor of the knee, its function however is dependant on the position of the knee joint. It is an active knee extensor from 20 to 30 degrees of flexion to full extension[4].
- The TFL works with the ITB to stabilize the knee when it is in full extension[5].
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References[edit | edit source]
- ↑ Radiopedia Knee Available: https://radiopaedia.org/articles/knee-joint-1?lang=gb(accessed 18.2.2022)
- ↑ Teach me anatomy. Muscles of the anterior thigh. Available from:https://teachmeanatomy.info/lower-limb/muscles/thigh/anterior-compartment// (last accessed 18.2.2022)
- ↑ Aclands Knee extensors Available: https://aclandanatomy.com/multimediaplayer.aspx?multimediaid=10528181(accessed 18.2.2022)
- ↑ Hyland S, Graefe S, Varacallo M. Anatomy, bony pelvis and lower limb, iliotibial band (tract). StatPearls [Internet]. 2020 Aug 10.Available: https://www.ncbi.nlm.nih.gov/books/NBK537097//(accessed 18.2.2022)
- ↑ Trammell AP, Nahian A, Pilson H. Anatomy, Bony Pelvis and Lower Limb, Tensor Fasciae Latae Muscle.Available: https://www.ncbi.nlm.nih.gov/books/NBK499870// (accessed 27.12.2021)
