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Related Concept Videos

Bone Formation by Endochondral Ossification01:24

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General Case of Eccentric Axial Loading01:12

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Unsymmetrical bending occurs when the bending moment applied to a structural member does not align with its principal axis. This misalignment leads to complex stress distributions and deflection patterns that differ from symmetrical bending, which are essential for designing structures to withstand different loading conditions.
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Changes in the Appendicular Skeleton with Age01:09

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The upper and lower limb initially develops as a small bulge called a limb bud, which appears on the lateral side of the early embryo. The upper limb bud appears near the end of the fourth week of development, with the lower limb bud appearing shortly after.
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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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The key clinical manifestations of Rheumatic heart disease (RHD) include several distinct cardiac symptoms.Carditis, a hallmark of acute rheumatic fever, involves inflammation of the heart's endocardium, myocardium, and pericardium. Chronic RHD often results from recurrent episodes of carditis. Its symptoms include the following:Murmurs are caused by valvular damage, especially to the mitral and aortic valves. Mitral stenosis or regurgitation is common, with characteristic heart murmurs...
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Related Experiment Video

Updated: Jul 12, 2025

Visualization of Chondrocyte Intercalation and Directional Proliferation via Zebrabow Clonal Cell Analysis in the Embryonic Meckel’s Cartilage
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Ochronotic Chondropathy: A Case Report.

Jake Littman1,2, John Pietro3, Jon Olansen1

  • 1Department of Orthopedic Surgery, Warren Alpert Medical School of Brown University, Providence, RI 02903, USA.

Biomedicines
|October 28, 2023
PubMed
Summary
This summary is machine-generated.

Alkaptonuria causes ochronosis, leading to joint degradation and cartilage damage. Studying this rare disease offers insights into skeletal biology and osteoarthritis treatments.

Keywords:
HGAalkaptonuriacartilagechondrocytechondropathyhomogentisic acidjoint degradationochronosisochronotic pigmentation

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Area of Science:

  • Biochemistry
  • Genetics
  • Pathology

Background:

  • Alkaptonuria (AKU), a rare genetic disorder, causes endogenous ochronosis characterized by bluish-black pigment deposition.
  • The disease leads to progressive joint degradation (ochronotic chondropathy) and requires joint replacements in many patients.
  • Key questions persist regarding the initiation of ochronotic pigmentation and tissue-specific resistance to damage.

Observation:

  • Presents a case of an 83-year-old female with diagnosed AKU.
  • Includes high-quality arthroscopic images showing articular cartilage fraying.
  • Details cellular changes in ochronotic chondrocytes and extracellular matrix alterations.

Findings:

  • Summarizes current literature on AKU's pathophysiological mechanisms.
  • Describes pigmentation patterns and joint degradation in human and mouse models.
  • Provides an overview of ochronotic chondropathy and joint degradation mechanisms.

Implications:

  • AKU, as a "fundamental disease," aids understanding of general skeletal biology.
  • Insights from AKU research may inform treatments for common pathologies like osteoarthritis.
  • Further study can elucidate tissue-specific responses to pigmentation-related damage.