Osteitis condensans ilii
Updates to Article Attributes
Osteitis condensans ilii is characterised by benign sclerosis of the ilium adjacent to the sacroiliac (SI) joint, typically bilateral and triangular in shape.
Clinical presentation
It is usually asymptomatic but uncommonly may cause lower back pain, with a frequency about 1-2.5% 4.
Pathology
The underlying etiologyaetiology is believed to be mechanical stress across the SI joint. That it is most often seen in women who have given birth supports this hypothesis, however, women who have not given birth and men can be affected 2-4.
Radiographic features
Plain filmradiograph and CT
Sclerosis of the ilial part of the sacroiliac joint is seen, typically bilateral and triangular in shape 3-4. Lack of involvement of sacrum or joint space narrowing is considered diagnostic and thus, may obviate the need for further imaging 3. Unilateral disease has also been reported.
Treatment and prognosis
It carries a benign prognosis and may even resolve spontaneously.
Differential diagnosis
The main differential diagnosis is asacroiliitis, but with osteitis condensans ilii the SI joint is normal with no irregularity, erosions or loss of joint space.
-<p><strong>Osteitis condensans ilii</strong> is characterised by benign sclerosis of the ilium adjacent to the <a href="/articles/sacroiliac-joint">sacroiliac (SI) joint</a>. </p><h4>Clinical presentation</h4><p>It is usually asymptomatic but uncommonly may cause lower back pain, with a frequency about 1-2.5% <sup>4</sup>.</p><h4>Pathology</h4><p>The underlying etiology is believed to be mechanical stress across the SI joint. That it is most often seen in women who have given birth supports this hypothesis, however, women who have not given birth and men can be affected <sup>2-4</sup>. </p><h4>Radiographic features</h4><h5>Plain film and CT</h5><p>Sclerosis of the ilial part of sacroiliac joint is seen, typically bilateral and triangular in shape <sup>3-4</sup>. Lack of involvement of sacrum or joint space narrowing is considered diagnostic and thus may obviate need for further imaging <sup>3</sup>. Unilateral disease has also been reported. </p><h4>Treatment and prognosis</h4><p>It carries a benign prognosis and may even resolve spontaneously. </p><h4>Differential diagnosis</h4><p>The main differential diagnosis is a <a href="/articles/sacroiliac-joint-disease-differential">sacroiliitis</a>, but with osteitis condensans ilii the SI joint is normal with no irregularity, erosions or loss of joint space.</p>- +<p><strong>Osteitis condensans ilii</strong> is characterised by benign sclerosis of the ilium adjacent to the <a href="/articles/sacroiliac-joint">sacroiliac (SI) joint</a>, typically bilateral and triangular in shape.</p><h4>Clinical presentation</h4><p>It is usually asymptomatic but uncommonly may cause lower back pain, with a frequency about 1-2.5% <sup>4</sup>.</p><h4>Pathology</h4><p>The underlying aetiology is believed to be mechanical stress across the SI joint. That it is most often seen in women who have given birth supports this hypothesis, however, women who have not given birth and men can be affected <sup>2-4</sup>. </p><h4>Radiographic features</h4><h5>Plain radiograph and CT</h5><p>Sclerosis of the ilial part of the sacroiliac joint is seen, typically bilateral and triangular in shape <sup>3-4</sup>. Lack of involvement of sacrum or joint space narrowing is considered diagnostic and thus, may obviate the need for further imaging <sup>3</sup>. Unilateral disease has also been reported. </p><h4>Treatment and prognosis</h4><p>It carries a benign prognosis and may even resolve spontaneously. </p><h4>Differential diagnosis</h4><p>The main differential diagnosis is a <a href="/articles/sacroiliac-joint-disease-differential">sacroiliitis</a>, but with osteitis condensans ilii the SI joint is normal with no irregularity, erosions or loss of joint space.</p>
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