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The knee joint is the most complicated joint in the body. It consists of three articulations– two tibiofemoral and one patellofemoral. As is characteristic of synovial joints, the knee joint has a thin articular capsule that partially surrounds this joint cavity. Additionally, several ligaments, muscles, and cartilaginous structures support the movement of the knee.
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The femur is the body's longest and strongest bone spanning the thigh region. Its head articulates with the acetabulum of the hip bone to form the hip joint. A minor indentation on the medial side of the femoral head, called the fovea capitis, serves as the site of attachment for the ligament of the head of the femur. This weak ligament spans the femur and acetabulum and supports the hip joint. The narrowed region below the head is the neck of the femur. The inclination angle between the...
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The movement of the legs is facilitated by numerous muscles located within the anterior, medial, and posterior compartments of the thigh.
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The ankle is formed by the talocrural joint (crural = leg). It consists of the articulations between the talus bone of the foot and the distal ends of the tibia and fibula of the leg. The superior aspect of the talus bone is square-shaped and has three areas of articulation. The top of the talus articulates with the inferior tibia. This is the portion of the ankle joint that carries the body weight between the leg and foot. The sides of the talus are firmly held in position by the articulations...
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The tibia is the main weight-bearing bone of the lower leg. It is larger than the fibula with which it is paired. The tibia is also the second longest bone in the body and is located right below the skin. The proximal end of the tibia forms the medial and the lateral condyle, which articulates with the condyles of the femur to form the knee joint. Between the articulating surfaces is the irregular elevated area known as the intercondylar eminence that serves as the inferior attachment point for...
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When a rod is made of different materials or has various cross-sections, it must be divided into parts that meet the necessary conditions for determining the deformation. These parts are each characterized by their internal force, cross-sectional area, length, and modulus of elasticity. These parameters are then used to compute the deformation of the entire rod.
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Related Experiment Video

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An Inertial Measurement Unit Based Method to Estimate Hip and Knee Joint Kinematics in Team Sport Athletes on the Field
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Knee Joint Loading during Single-Leg Forward Hopping.

Rebecca L Krupenevich1, Alison L Pruziner, Ross H Miller

  • 11Department of Kinesiology, University of Maryland, College Park, MD; 2DoD-VA Extremity Trauma and Amputation Center of Excellence, Bethesda, MD; 3Walter Reed National Military Medical Center, Bethesda, MD; and 4Neuroscience & Cognitive Science Program, University of Maryland, College Park, MD.

Medicine and Science in Sports and Exercise
|September 27, 2016
PubMed
Summary
This summary is machine-generated.

Hopping places greater stress on the knee joint than walking. This suggests limiting hopping in individuals with limb loss may reduce the risk of knee osteoarthritis.

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Area of Science:

  • Biomechanics
  • Orthopedics
  • Kinesiology

Background:

  • Individuals with unilateral lower limb loss have a higher risk of knee osteoarthritis in their intact limb.
  • Abnormal loading on the intact limb is a suspected cause, but walking analysis has shown similar knee joint loading.
  • Other movements, like hopping, may place unusual loads on the knee, necessitating further investigation.

Purpose of the Study:

  • To compare knee joint kinetics during single-leg forward hopping versus walking in healthy adults.
  • To evaluate the mechanical effects of hopping on the intact limb as a potential risk factor for knee osteoarthritis.

Main Methods:

  • Twenty-four healthy adults performed self-selected speed walking and hopping.
  • Knee joint moments were calculated using inverse dynamics.
  • Paired Student's t-tests compared peak knee flexion moment (KFM), peak knee adduction moment (KAM) impulse, and KAM loading rate (LR) between conditions.

Main Results:

  • Peak KFM was significantly greater during hopping (20.73% body weight × height) compared to walking (5.51% body weight × height).
  • KAM LR was also significantly higher during hopping (0.47 BW·Ht·s) than walking (0.33 BW·Ht·s).

Conclusions:

  • Hopping generates greater kinetic loads on the knee joint compared to walking.
  • Limiting single-leg forward hopping in the limb loss population may be advisable to mitigate potential increases in knee osteoarthritis risk.