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Related Concept Videos

Bones of the Lower Limb: Tibia and Fibula01:10

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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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Structural Classification of Joints01:20

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Joints, also known as articulations, are classified based on their structural characteristics, i.e., based on whether the articulating surfaces of the adjacent bones are directly connected by fibrous connective tissue or cartilage, or whether the articulating surfaces contact each other within a fluid-filled joint cavity. These differences serve to divide the joints of the body into three structural classifications.
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Bones of the Lower Limb: Femur and Patella01:16

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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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Functional Classification of Joints01:09

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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.
Synarthrosis
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Classification of Bones01:18

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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.
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Related Experiment Video

Updated: Jan 10, 2026

A Mouse Model of Ankle-Subtalar Complex Joint Instability
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Subtalar Joint Statistical Shape Modeling Differentiates Cavus-to-Planus Foot Types From Weightbearing CT.

E Renae Lapins1,2, Andrew C Peterson2, Charles L Saltzman3

  • 1Department of Biomedical Engineering, University of Utah, Salt Lake City, UT, USA.

Foot & Ankle Orthopaedics
|November 28, 2025
PubMed
Summary
This summary is machine-generated.

The subtalar joint (STJ) alone accurately models foot types from cavus to planus, simplifying analysis for pathologies. This two-bone model captures 70.9% of variance, proving effective for clinical applications.

Keywords:
Charcot-Marie-Tooth diseasefoot typepes cavuspes planusprogressive collapsing foot deformityradiographic measurementsstatistical shape modelingweightbearing computed tomography

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Area of Science:

  • Biomechanics and medical imaging
  • Computational anatomy and statistical modeling
  • Orthopedic research

Background:

  • Foot type influences foot and ankle pathologies through biomechanics and force distribution.
  • Current assessment relies on qualitative methods and 2D Meary's angle, limiting accuracy.
  • Statistical shape models (SSMs) offer a potential for quantitative analysis.

Purpose of the Study:

  • Determine the minimum bone count for accurate foot type representation in SSMs.
  • Enable machine learning applications for clinical assessment of foot morphology.
  • Investigate the role of the subtalar joint (STJ) in foot type classification.

Main Methods:

  • Weightbearing computed tomography (WBCT) data from 151 patients across various foot types (CMT, cavus, rectus, planus, PCFD).
  • Creation of ten multi-bone SSMs with varying bone numbers from segmented bony structures.
  • Principal component analysis (PCA) to assess modes of variation and capture variance in all SSMs.

Main Results:

  • The 2-bone STJ model captured the highest variance (70.9%) and effect size (0.75) in PCA mode 1.
  • Models including the STJ showed significant differences between all foot type groups.
  • Severe cavus and planus deformities were identified at 2 standard deviations from the mean STJ shape.

Conclusions:

  • STJ orientation and morphology are critical for differentiating foot types.
  • A simplified 2-bone STJ model provides sufficient information for computational differentiation.
  • This approach holds potential for streamlined clinical assessment and treatment planning.