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Related Concept Videos

Changes in the Appendicular Skeleton with Age01:09

Changes in the Appendicular Skeleton with Age

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.
Initially, the limb buds consist of a core of mesenchyme covered by a layer of ectoderm. The ectoderm at the end of the limb bud thickens to form a narrow crest called the apical ectodermal ridge. This ridge stimulates the underlying...
Bones of the Lower Limb: Femur and Patella01:16

Bones of the Lower Limb: Femur and Patella

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 neck...
Development of the Limb Synovial Joints01:07

Development of the Limb Synovial Joints

Joints form during embryonic development in conjunction with the formation and growth of the associated bones. The embryonic tissue that gives rise to all bones, cartilage, and connective tissues of the body is called mesenchyme.
The mesenchymal stem cells differentiate into chondrocytes that form the hyaline cartilage, and later the cartilaginous model of the bone. This model further transforms into a bone. This process is known as endochondral ossification.
During development, the limbs...
Bones of the Lower Limb: Tibia and Fibula01:10

Bones of the Lower Limb: Tibia and Fibula

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...
Bones of the Upper Limb: Humerus01:19

Bones of the Upper Limb: Humerus

The upper limb consists of the arm, forearm, wrist, and hand bones. The humerus is the single bone of the upper arm region. Proximally, it has a large, spherical, smooth head that articulates with the glenoid cavity of the scapula to form the glenohumeral or shoulder joint. The margin of the head is the anatomical neck, a residual epiphyseal plate. Laterally it extends to form bony projections called the greater tubercle and the lesser tubercle. Next to the tubercles is the surgical neck, a...
Classification of Bones01:18

Classification of Bones

The bones of the human skeletal system are of varied shapes, sizes, and functions. They can be classified based on their shape and function into four major classes: long bones, short bones, flat bones, and irregular bones. Some classifications include a fifth type, the sesamoid bones, as a separate class, whereas others categorize them under short bones.
Long and Short Bones
The appendicular skeleton, particularly the upper and lower limbs, is primarily made of long and short bones. The long...

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Related Experiment Video

Updated: Jun 27, 2026

Chicken Recombinant Limbs Assay to Understand Morphogenesis, Patterning, and Early Steps in Cell Differentiation
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Published on: January 12, 2022

[Bone dysplasia with short limb].

Daisuke Kobayashi1, Shinichi Satsuma

  • 1Kobe Children's Hospital, Department of Orthopaedic surgery, Japan.

Clinical Calcium
|December 2, 2008
PubMed
Summary
This summary is machine-generated.

This study reviews bone dysplasia conditions like Achondroplasia, focusing on diagnosis through clinical and X-ray findings. Early and accurate diagnosis of these short-limbed conditions is crucial for patient care.

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Last Updated: Jun 27, 2026

Chicken Recombinant Limbs Assay to Understand Morphogenesis, Patterning, and Early Steps in Cell Differentiation
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Area of Science:

  • Orthopedics
  • Medical Genetics
  • Radiology

Background:

  • Bone dysplasias, including Achondroplasia, Pseudoachondroplasia, Metaphyseal Chondrodysplasia (Schmid type), and Mesomelic dysplasia (Dyschondrosteosis), are characterized by short stature and short limbs.
  • While Achondroplasia often presents evident clinical features at birth, other conditions may show subtle or delayed clinical and radiological findings during childhood.

Purpose of the Study:

  • To describe the clinical, radiological, and orthopedic aspects of representative bone dysplasia disorders.
  • To emphasize the importance of careful examination for accurate and timely diagnosis of these conditions.

Main Methods:

  • Review of clinical presentations.
  • Analysis of radiographic (X-ray) appearances.
  • Assessment of orthopedic problems associated with specific bone dysplasias.

Main Results:

  • Characteristic clinical and X-ray features aid in diagnosing Achondroplasia, Pseudoachondroplasia, Metaphyseal Chondrodysplasia (Schmid type), and Mesomelic dysplasia (Dyschondrosteosis).
  • Diagnostic findings may not be apparent at birth for all types, developing progressively during childhood.

Conclusions:

  • Accurate diagnosis of bone dysplasia is achievable through careful clinical and radiological evaluation.
  • Prompt diagnosis is vital for establishing a positive therapeutic relationship with patients presenting with short stature and limb shortening.