Knee Extensors
Original Editor-Lucinda hampton
Top Contributors-Lucinda hampton
Introduction[edit|edit source]
的knee extensors play an essential role in human movement. The one agonist muscle that extends the knee is the massivequadriceps.
- Knee extension ROM is from full flexion to 5-10° hyperextension.
- 的iliotibial tract(ITB) andtensor fascia latae(TFL) also play a role in knee extension[1].
- 的knee extensors play a significant role in ADLs.
- 的quadriceps femoris, which is said to be the largest muscle group, has a volume of 86.6 cu in (1420 cu cm)[2].
两种[edit|edit source]
的quadriceps femoris consists of four individual muscles, three of the heads arise from the femur, thevastus intermedius,vastus medialis, andvastus 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.[3]的quadriceps in the agonist of knee extension[4]. Synergists include:
- 的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[5].
- 的TFL works with the ITB to stabilize the knee when it is in full extension[6].
Physiotherapy Significance[edit|edit source]
的knee extensors are essential fordaily activitieseg climbing stairs, getting up from the chair, walking (getting used significantly when going downhill).
的knee extensors are important in many sports eg kicking, jumping, cycling,跑步、篮球(需要跳跃)[7].
Knee extension strength is a significant determinant of performance on static and dynamicbalancetests.[8]
的term ‘muscle lag’ or ‘extensor lag’ or ‘quadriceps lag’ is a clinical sign with often profound functional relevance for patients during knee rehabilitation. SeeKnee Extension Lag
See also
Active Knee Extension Test,Passive Knee Extension Test
Knee Extension Resistance Test
References[edit|edit source]
- ↑Radiopedia Knee Available:https://radiopaedia.org/articles/knee-joint-1?lang=gb(accessed 18.2.2022)
- ↑Kidadl Biggest Muscle In The Body: Fun Body Facts Revealed For KidsAvailable:https://kidadl.com/fun-facts/biggest-muscle-in-the-body-fun-body-facts-revealed-for-kids(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)
- ↑PhysiopediaQuadricepsAvailable:Quadriceps Muscle(accessed 18.2.2022)
- ↑Carter ND, Khan KM, Mallinson A, Janssen PA, Heinonen A, Petit MA, McKay HA.Knee extension strength is a significant determinant of static and dynamic balance as well as quality of life in older community-dwelling women with osteoporosis. Gerontology. 2002;48(6):360-8. Available:https://pubmed.ncbi.nlm.nih.gov/12393951/(accessed 18.2.2022)
