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Related Concept Videos

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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Related Experiment Video

Updated: Dec 27, 2025

The Transition to an Anterior-Based Muscle Sparing Approach Improves Early Postoperative Function but is Associated with a Learning Curve
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Acetabular defects in revision hip arthroplasty: a therapy-oriented classification.

Dieter Christian Wirtz1, Max Jaenisch2, Thiemo Antonius Osterhaus1

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|February 27, 2020
PubMed
Summary

The Acetabular Defect Classification (ADC) provides a reliable system for evaluating acetabular bone loss. This new guideline helps surgeons manage complex cases with improved accuracy and reproducibility.

Keywords:
AcetabulumArthroplastyClassificationHipPaproskyRevision

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Area of Science:

  • Orthopedic surgery
  • Trauma surgery
  • Radiology

Background:

  • Severe acetabular bone loss presents a significant treatment challenge.
  • Current classification systems lack intuitive design and therapeutic guidance.
  • A need exists for a reliable guideline for acetabular defect evaluation and treatment.

Purpose of the Study:

  • To introduce the Acetabular Defect Classification (ADC) system.
  • To provide an intuitive, reproducible, and reliable guideline for acetabular defects.
  • To correlate radiographic grading with intraoperative findings.

Main Methods:

  • The ADC system classifies defects based on acetabular rim integrity and supporting structures into 4 types.
  • 207 preoperative radiographs were graded using ADC and compared with intraoperative findings.
  • Inter- and intra-rater reliability was assessed by 5 observers on 80 patients.

Main Results:

  • Good agreement was found between radiographic grading and intraoperative findings (k=0.74).
  • Interobserver agreement was substantial (k=0.62).
  • Intraobserver agreement was very good (k=0.78).

Conclusions:

  • The Acetabular Defect Classification (ADC) is an intuitive, reliable, and reproducible system.
  • ADC effectively guides surgeons in pre- and intraoperative decision-making for acetabular defects.
  • This classification aids in managing complex acetabular bone loss.