Apophysis of the proximal 5th metatarsal

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The apophysis of the proximal 5th metatarsal lies laterally and is oriented longitudinally parallel to the shaft.

Apophysis of the fifth metatarsal base appears on plain radiographs at age 12 for boys and 10 for girls. Fusion of the apophysis to the metatarsal base usually occurs within the following 2–4 years.^3,4

Differential diagnosis

It should not be confused with an os peroneum or an avulsion fracture. A An avulsion fracture at this location is typically extra-articular and oriented transversally as compared to the longitudinal orientation of unfused apophysis.

Related pathology

Iselin disease (apophysitis)

-<p>The <strong>apophysis of the proximal 5th metatarsal</strong> lies laterally and is oriented longitudinally parallel to the shaft.</p><p>Apophysis of the fifth metatarsal base appears on plain radiographs at age 12 for boys and 10 for girls. Fusion of the apophysis to the metatarsal base usually occurs within the following 2–4 years.<sup>3,4</sup></p><h4>Differential diagnosis</h4><p>It should not be confused with an <a href="/articles/os-peroneum">os peroneum</a> or an <a href="/articles/avulsion-fracture-of-the-5th-metatarsal-styloid">avulsion fracture</a>. A fracture at this location is typically oriented transversally as compared to the longitudinal orientation of unfused <a href="/articles/apophysis">apophysis</a>.</p><h4>Related pathology</h4><ul><li>
+<p>The <strong>apophysis of the proximal 5th metatarsal</strong> lies laterally and is oriented longitudinally parallel to the shaft.</p><p>Apophysis of the fifth metatarsal base appears on plain radiographs at age 12 for boys and 10 for girls. Fusion of the apophysis to the metatarsal base usually occurs within the following 2–4 years.<sup>3,4</sup></p><h4>Differential diagnosis</h4><p>It should not be confused with an <a href="/articles/os-peroneum">os peroneum</a> or an <a href="/articles/avulsion-fracture-of-the-5th-metatarsal-styloid">avulsion fracture</a>. An avulsion fracture at this location is typically extra-articular and oriented transversally as compared to the longitudinal orientation of unfused <a href="/articles/apophysis">apophysis</a>.</p><h4>Related pathology</h4><ul><li>

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Apophysis of the proximal 5th metatarsal

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Differential diagnosis

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