Sven is a 54-year-old accountant and recreational runner who, for the last six months, has been increasing the volume of runs ahead of a planned marathon event in three months.

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<p>Sven is a 54-year-old accountant and recreational runner who, for the last six months, has been increasing the volume of runs ahead of a planned marathon event in three months.</p><p>A month ago, he developed niggly pain in the right groin during runs lasting over two hours. </p><p>The pain has progressed, and walking and standing are now uncomfortable.</p><p>There is no past history of note. Vital signs are unremarkable.</p><p>Sven has an antalgic gait. Hip range of movement is full but painful at end range. He is unable to hop on the right leg.</p><p>His pelvic X-ray is shown.</p>

Dr Kate Kelso is a GP and medical editor of Australian Doctor.