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Knee Joint01:23

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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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Structural Joints: Cartilaginous Joints01:17

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As the name indicates, at a cartilaginous joint, the adjacent bones are united by cartilage, a tough but flexible type of connective tissue. Unlike synovial joints, these types of joints lack a joint cavity and involve bones joined together by either hyaline cartilage or fibrocartilage.
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Chondrocytes form a temporary cartilaginous model by dividing and secreting a thick gel-like extracellular matrix. Once the chondrocytes undergo programmed cell death, osteoblasts enter the site of the cartilaginous model. The process of replacing the temporary cartilaginous model with bone in an ordered manner is called endochondral ossification. In endochondral ossification, not all of the cartilage is replaced by bone tissue. Some cartilage that performs a protective and supportive function...
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Functional Classification of Joints
The functional classification of joints is determined by the amount of mobility between the adjacent bones. Joints are functionally classified as a synarthrosis or immobile joint, an amphiarthrosis or slightly moveable joint, or as a diarthrosis, a freely moveable joint. Fibrous and cartilaginous joints can be functionally classified as either synarthroses  or amphiarthroses, whereas all synovial joints are classified as diarthroses.
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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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Unsymmetric Bending - Angle of Neutral Axis01:15

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Unsymmetrical bending occurs when a structural member is subjected to bending moments in a plane that does not align with the member's principal axes. This scenario typically arises in beams and other structural components when loads are applied at non-ideal angles, introducing complexities in stress analysis.
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Alignment does not influence cartilage T2 in asymptomatic knee joints.

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  • 1Department of Orthopaedic Sports Medicine, Klinikum Rechts der Isar, Technische Universitaet Muenchen, Ismaninger Str. 69, 81675, Munich, Germany.

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Summary

Static knee alignment in young, asymptomatic individuals does not impact cartilage ultrastructure, as shown by T2 quantitative imaging. This suggests alignment alone does not alter knee cartilage health in the absence of injury.

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Area of Science:

  • Orthopedics
  • Radiology
  • Biomedical Engineering

Background:

  • Knee alignment is a critical factor in joint health.
  • Articular cartilage ultrastructure can be assessed using T2 relaxation MRI.
  • Understanding the relationship between alignment and cartilage health is important for early detection of knee issues.

Purpose of the Study:

  • To investigate the effect of static frontal plane knee alignment on articular cartilage ultrastructure.
  • To determine if T2 relaxation MRI can detect changes in cartilage ultrastructure related to knee alignment in asymptomatic individuals.

Main Methods:

  • A cross-sectional study involving 48 asymptomatic volunteers (n=96 knees).
  • Knee alignment was assessed using the hip-knee-ankle angle and categorized into neutral, mild varus, severe varus, and valgus groups.
  • Articular cartilage ultrastructure was evaluated using T2 mapping MRI.

Main Results:

  • Significant differences in leg alignment were observed between the groups.
  • No significant differences in clinical measures or detected morphological pathology were found across groups.
  • Global T2 values of the cartilage were not significantly different between alignment groups or genders.

Conclusions:

  • Static frontal plane leg malalignment does not affect cartilage ultrastructure in young, asymptomatic individuals.
  • T2 quantitative imaging suggests that alignment alone does not alter cartilage ultrastructure in this population.