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Related Concept Videos

Joints01:26

Joints

28.7K
Joints, also called articulations or articular surfaces, are points at which ligaments or other tissues connect adjacent bones. Joints permit movement and stability, and can be classified based on their structure or function.
Structural joint classifications are based on the material that makes up the joint as well as whether or not the joint contains a space between the bones. Joints are structurally classified as fibrous, cartilaginous, or synovial.
Fibrous Joints Are Immovable
The bones of a...
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Fractures: Bone Repair01:27

Fractures: Bone Repair

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Treatment for a fracture is based on the type of break, the bone affected, and the patient's age.
Minor fractures with no bone displacement are treated by immobilizing the fractured bone using a cast or splint. However, in the case of fractures with displaced bones, the broken bones are repositioned before immobilization to ensure successful healing without deformation and loss of function. The realignment of fractured bone ends is performed through a process called reduction. If the...
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Functional Classification of Joints01:09

Functional Classification of Joints

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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
An...
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Appendicitis-II: Diagnostic Studies and Management01:29

Appendicitis-II: Diagnostic Studies and Management

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Diagnosing and managing appendicitis requires a structured and comprehensive approach that spans from initial assessment to postoperative care. Here is an overview of the process:
Diagnosing Appendicitis
It requires a multifaceted approach, starting with a detailed physical examination to pinpoint the location and nature of the pain and identify any associated symptoms. Laboratory tests play a crucial role. A complete Blood Count (CBC) typically reveals leukocytosis (an increased number of...
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Mitral Valve Prolapse II: Assessment and Management01:22

Mitral Valve Prolapse II: Assessment and Management

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IntroductionA range of clinical features characterizes Mitral Valve Prolapse (MVP), but it is important to note that many individuals with MVP are asymptomatic and may remain so throughout their lives. For those who do exhibit symptoms, the following are the key clinical features:Palpitations: This is a common symptom where individuals feel an irregular or rapid heartbeat. Palpitations in MVP are often due to arrhythmias such as premature ventricular contractions or supraventricular...
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Degenerative Disc Disease I: Introduction01:27

Degenerative Disc Disease I: Introduction

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Degenerative disc disease is a chronic condition in which intervertebral discs gradually lose structure and function. It is not infectious or autoimmune; rather, it results from age-related biochemical and mechanical changes, influenced by genetic, metabolic, and environmental factors.Structure and Function of DiscsThe spine contains 23 intervertebral discs that absorb load, distribute forces, maintain spacing, and allow flexibility. Each disc consists of a nucleus pulposus, a gel-like core...
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25-year follow-up of 102 unrevised cementless total hip arthroplasties with a second-generation metal-on-metal bearing in a young patient cohort.

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Lower re-revision rates after UKA-to-TKA than UKA-to-UKA revision for failed medial unicompartmental knee arthroplasty at mid-term follow-up.

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Related Experiment Video

Updated: May 3, 2026

Individualized Stem-positioning in Calcar-guided Short-stem Total Hip Arthroplasty
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[Why does a total hip replacement dislocate? : Diagnosis and management].

Raphael Trefzer1, Franz Reichel1, Mustafa Hariri1

  • 1Orthopädische Universitätsklinik Heidelberg, Schlierbacher Landstraße 200a, 69118, Heidelberg, Deutschland.

Orthopadie (Heidelberg, Germany)
|May 31, 2025
PubMed
Summary

Dislocations are a major complication of total hip arthroplasty (THA), often requiring revision surgery. Careful patient assessment, precise implant positioning, and appropriate implant selection are key to preventing THA instability and dislocations.

Keywords:
BiomechanicsHip prosthesis implantationJoint dislocationsNeurologic disordersRevision surgery

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Area of Science:

  • Orthopedic surgery
  • Biomedical engineering
  • Arthroplasty research

Context:

  • Dislocations are a leading complication of primary total hip arthroplasty (THA), frequently necessitating early surgical revision.
  • Patient-specific factors (neurological disorders, spinopelvic mobility) and implant-related issues can increase THA instability.
  • A wide array of preventive measures exists for THA dislocation in both primary and revision procedures.

Purpose:

  • To review the causes of THA instability and dislocations.
  • To outline preventive strategies for THA dislocation.
  • To present diagnostic and therapeutic algorithms for managing THA dislocations.

Summary:

  • Precise implant positioning, tailored to patient biomechanics, is crucial for preventing THA dislocation.
  • While specialized implants like tripolar acetabular systems and constrained liners have roles, they are not universally indicated.
  • THA dislocation is a medical emergency requiring prompt evaluation and management, with imaging guiding further treatment.

Impact:

  • Improved understanding of THA dislocation etiology and prevention.
  • Guidance on appropriate implant selection and surgical technique to minimize dislocation risk.
  • Standardized diagnostic and management protocols for THA dislocations to improve patient outcomes.