Knee Extension
Knee Extension - Related Videos
12:01
Knee Exam
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2023
Source: Robert E. Sallis, MD. Kaiser Permanente, Fontana, California, USA The knee is a hinged joint that connects the femur with the tibia. It is the largest joint in the body, and due to its location in the middle of the lower leg, it is subjected to a variety of traumatic and degenerative forces. Examination of the knee can be quite complex, owing to the fact it is an inherently unstable joint held together by various ligaments and supported by menisci, which act as shock absorbers and...
07:33
In Vitro Application of a Wireless Sensor in Flexion-Extension Gap Balance of Unicompartmental Knee Arthroplasty
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Cited by 2 •
2023
This protocol presents a cadaveric study of a wireless sensor used in medial unicompartmental knee arthroplasty. The protocol includes the installation of an angle measuring device, standardized Oxford unicompartmental knee arthroplasty osteotomy, preliminary assessment of flexion-extension balance, and application of the sensor to measure flexion-extension gap pressure.
11:09
Visualization of Knee Joint Degeneration after Non-invasive ACL Injury in Rats
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2023
Source: Lindsey K. Lepley1,2, Steven M. Davi1, Timothy A. Butterfield3,4 and Sina Shahbazmohamadi5, 1Department of Kinesiology, University of Connecticut, Storrs, CT; 2Department of Orthopaedic Surgery, University of Connecticut Health Center, Farmington, CT; 3Department of Rehabilitation Sciences, University of Kentucky, Lexington, KY; 4Center for Muscle Biology, Department of Physiology, University of Kentucky, Lexington, KY; 5Biomedical Engineering Department, University of Connecticut,...
28:40
Proboscis Extension Response (PER) Assay in Drosophila
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Cited by 120 •
2007
Proboscis extension response or PER is a taste behavior assay that has been used in flies as well as in honeybees. When the proboscis makes contact with an attractive substance, the fly extends its proboscis to consume the substance. Solutions of various sugars are very attractive to the fly.
03:32
Using a Macrophage Conditioned Medium to Promote Neuron Extensions
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2025
This video demonstrates an assay for promoting the growth of neuron projections known as neurite outgrowth using the macrophage-conditioned medium. Co-culture neurons and macrophages with cAMP and harvest the macrophage-derived conditioned medium. Growing the neurons with the conditioned medium promotes neurite outgrowths. These outgrowths are fluorescently labeled and visualized using a fluorescence microscope.
FAQs
During Knee Extension, the quadriceps femoris contracts and generates force that passes through the patella and patellar tendon. This force is transmitted to the tibia relative to the femur, producing the required movement. The patella and tendon therefore form an important mechanical link between muscle contraction and movement at the knee joint.
Coordinated joint motion helps the knee transfer load efficiently as the lower limb moves. Extension is not only a muscle action; the joint must also manage force between the femur and tibia while surrounding structures support stability. Poor coordination can reduce movement efficiency and may contribute to functional difficulty during standing, walking, or climbing.
Several clinical problems may limit full Knee Extension, including restricted joint range of motion, quadriceps weakness, pain, and injuries involving the knee or nearby tissues. These findings can reduce lower-limb stability and make everyday movements more difficult. Identifying which problem is present helps direct evaluation and supports selection of appropriate rehabilitation strategies.
Assessment focuses on whether the knee can achieve its expected range of extension and whether movement is accompanied by pain or weakness. Clinicians also consider the stability and function of the lower limb, along with possible joint or surrounding-tissue injury. These findings help distinguish mobility limitations from problems involving muscle performance or painful movement.
Extension exercises are used to address limitations in mobility and to support recovery of lower-limb function. A targeted rehabilitation program can help improve movement, strengthen or retrain relevant muscle performance, and support more stable activity. The approach is particularly relevant after knee surgery or trauma, when restoring functional motion is an important recovery goal.
Restoring knee extension matters when limited movement interferes with standing, walking, climbing, or maintaining lower-limb stability. Rehabilitation aims not only to increase available motion but also to improve functional performance and support efficient load transfer through the joint. In medical care, progress can therefore be judged by both movement quality and the person's ability to perform essential activities.