Osteitis condensans ilii
Updates to Article Attributes
Osteitis condensans ilii is (also known as hyperostosis triangularis ilii, a term used in Germany) 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 of about 1-2.5% 4.
Pathology
The underlying aetiology is believed to be mechanical stress across the sacroiliac joint. Supporting this hypothesis, it is most often seen in women who have given birth; however, men and nulliparous women can be affected 2-4.
Radiographic features
Plain radiograph and CT
Sclerosis of the iliac side of the sacroiliac joint, typically bilateral, symmetrical, and triangular in shape 3,4. Lack of sacral involvement or joint space narrowing is considered diagnostic and may obviate the need for further imaging 3 (symmetric small focal scleroses of the apposing sacrum is allowable though). Unilateral disease has been reported.
Treatment and prognosis
It carries a benign prognosis and may even resolve spontaneously.
Differential diagnosis
The main differential diagnosis is a sacroiliitis. With osteitis condensans ilii, the sacroiliac 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>, 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 of about 1-2.5% <sup>4</sup>.</p><h4>Pathology</h4><p>The underlying aetiology is believed to be mechanical stress across the sacroiliac joint. Supporting this hypothesis, it is most often seen in women who have given birth; however, men and nulliparous women can be affected <sup>2-4</sup>. </p><h4>Radiographic features</h4><h5>Plain radiograph and CT</h5><p>Sclerosis of the iliac side of the sacroiliac joint, typically bilateral, symmetrical, and triangular in shape <sup>3,4</sup>. Lack of sacral involvement or joint space narrowing is considered diagnostic and may obviate the need for further imaging <sup>3</sup>. Unilateral disease has 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/sacroiliitis-differential">sacroiliitis</a>. With osteitis condensans ilii, the sacroiliac joint is normal, with no irregularity, erosions, or loss of joint space.</p>- +<p><strong>Osteitis condensans ilii</strong> (also known as <strong>hyperostosis triangularis ilii</strong>, a term used in Germany) 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 of about 1-2.5% <sup>4</sup>.</p><h4>Pathology</h4><p>The underlying aetiology is believed to be mechanical stress across the sacroiliac joint. Supporting this hypothesis, it is most often seen in women who have given birth; however, men and nulliparous women can be affected <sup>2-4</sup>. </p><h4>Radiographic features</h4><h5>Plain radiograph and CT</h5><p>Sclerosis of the iliac side of the sacroiliac joint, typically bilateral, symmetrical, and triangular in shape <sup>3,4</sup>. Lack of sacral involvement or joint space narrowing is considered diagnostic and may obviate the need for further imaging <sup>3</sup> (symmetric small focal scleroses of the apposing sacrum is allowable though). Unilateral disease has 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/sacroiliitis-differential">sacroiliitis</a>. With osteitis condensans ilii, the sacroiliac joint is normal, with no irregularity, erosions, or loss of joint space.</p>
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