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Related Experiment Videos

Radiologic changes of ischial tuberosity in ankylosing spondylitis.

Z Jajić1, I Jajić, T Nemcić

  • 1Department of Rheumatology, Sestre Milosrdnice University Hospital, Vinogradska 29, 10000 Zagreb, Croatia.

Acta Medica Croatica : Casopis Hravatske Akademije Medicinskih Znanosti
|June 29, 2001
PubMed
Summary

The ischial tuberosity is a key indicator for diagnosing ankylosing spondylitis, especially when other signs are unclear. Radiographic changes in this area help assess disease progression and severity.

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Area of Science:

  • Rheumatology
  • Radiology
  • Orthopedics

Background:

  • Ankylosing spondylitis (AS) diagnosis often relies on sacroiliitis.
  • Early or subtle AS may present without clear sacroiliitis.
  • The ischial tuberosity's role in AS diagnosis needs further emphasis.

Purpose of the Study:

  • To highlight the diagnostic significance of ischial tuberosity involvement in ankylosing spondylitis.
  • To correlate radiographic changes in the ischial tuberosity with disease stages.
  • To propose the ischial tuberosity as a diagnostic marker when sacroiliitis is minimal or absent.

Main Methods:

  • Radiographic examination of the ischial tuberosity in 68 patients with varying stages of ankylosing spondylitis.
  • Pelvic anteroposterior radiographs assessed by two independent radiologists.

Related Experiment Videos

  • Classification of radiographic changes into four distinct stages: minimal, destructive, reconstructive, and ossification (tufts phenomenon).

    • Main Results:

    • Radiographic enthesitis changes in the ischial tuberosity were observed in 45.5% of patients.
    • Destructive changes (Stage 2) were most common (42.0%), followed by reconstructive changes (Stage 3, 35.5%).
    • The 'tufts phenomenon' (Stage 4) was noted in 16.0% of patients.

    Conclusions:

    • Ischial tuberosity radiography reveals enthesitis in a significant portion of ankylosing spondylitis patients.
    • A four-stage classification system aids in assessing disease extent and progression.
    • Ischial tuberosity changes are valuable for diagnosing ankylosing spondylitis, particularly when sacroiliitis is not prominent.