MSFinals-2434
A twenty-seven-year-old male presents to the emergency department with an ache-like pain in his back that radiates to his right groin. The pain started three days ago, has been progressively worsening, and is exacerbated by walking. He has attempted to alleviate the pain with paracetamol and ibuprofen, but to no avail. He also reports feeling feverish and experiencing chills for the past 24 hours.
The patient has no significant medical history but is a heavy smoker, consuming 20 cigarettes a day, drinks 30 units of alcohol per week, and injects heroin daily. Upon examination, his heart rate is 96/minute, respiratory rate is 14/minute, blood pressure is 116/72 mmHg, and oxygen saturations are 98%. His temperature is 38.4 ºC.
During examination of the spine and right hip, he experiences pain on movement of the hip joint, particularly flexion, but is not tender on palpation of the spine or hip joint. There is no evidence of swelling or erythema of the spine or hips, and no difference in temperature. Abdominal examination reveals a soft and non-tender abdomen, without organomegaly and present bowel sounds. The kidneys are non-ballotable.
What is the most likely diagnosis?