Masters Marathoner With Unilateral Calf Pain, Recent Travel, and a Fluoroquinolone
A 52-year-old male marathoner presents 3 days after an 11-hour flight with a painful, swollen left calf. He completed a 22-mile long run 6 days ago and started levofloxacin 10 days ago for sinusitis, with the last dose 2 days ago. There was no pop. The leg feels tight and heavy, worse with weight bearing and hanging down, and better with elevation. He has no chest pain or dyspnea.
Examination: left calf circumference is 39 cm versus 36 cm on the right, with diffuse tenderness along the medial calf, mild warmth, and no discrete defect in the Achilles tendon. Thompson test is negative, though he has difficulty relaxing. Distal pulses are palpable and symmetric, and sensation and strength are intact. He has a marathon in 5 weeks and asks for dry needling and deep tissue work to "loosen it up" before his next long run.
1. What is your immediate priority, and which findings would escalate the disposition?
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Immediate priority: exclude a deep vein thrombosis before examining or treating this as a muscle tear. The constellation - prolonged immobility, unilateral swelling with a 3 cm circumference difference, warmth, diffuse medial calf tenderness, and worsening with dependency - is a validated clinical pattern, and a Wells score in this patient crosses into the "likely" range, which means imaging, not a therapeutic trial of soft-tissue work.
Escalation: send him for same-day or next-day compression ultrasound of the left leg, and if that is unavailable, arrange urgent assessment rather than a follow-up appointment in a week. If he develops dyspnea, pleuritic chest pain, syncope, or unilateral leg swelling that becomes markedly worse, he goes to the emergency department for evaluation of pulmonary embolism. He should be told to avoid prolonged sitting and to seek urgent care for those symptoms.
What not to do today: no deep tissue massage, no dry needling, no instrument-assisted scraping, and no aggressive stretching. In a limb with a possible thrombus, mechanical manipulation of the calf is a plausible dislodgement risk, and it also destroys the physical examination for the clinician who sees him next. Send him in a compression stocking only if it improves comfort and after the diagnosis is settled.
2. The ultrasound is negative. How does your differential and management change, and how does the levofloxacin affect your reasoning?
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Differential after a negative duplex: the leading concern becomes an Achilles or musculotendinous injury, most likely a partial tear or strain of the medial gastrocnemius or the soleus, or Achilles tendinopathy with a superimposed acute component. A plantaris rupture is possible but typically produces a more focal, higher medial calf pain with a palpable defect and a positive Thompson-like sign. A Baker cyst leak or a soleal vein thrombosis are additional considerations, the latter sometimes missed on a limited study.
Role of the fluoroquinolone: levofloxacin substantially raises the risk of tendinopathy and of Achilles rupture, and the risk window extends for weeks after the last dose and is higher in men over 60, in corticosteroid users, and in people returning to high load. This shifts my index of suspicion toward tendon involvement and away from a simple strain, and it also means his 22-mile run 6 days ago was performed under that elevated risk.
Management: load off the tendon - relative rest, heel lift, isometrics, and a graded progression, with no explosive loading or plyometrics until pain and strength allow. Avoid corticosteroid injection and avoid further fluoroquinolone exposure; document both. Reassess at 1–2 weeks, and obtain MRI or ultrasound of the tendon if he fails to progress or if a discrete defect becomes palpable.
3. Five weeks later he still has pain. What does that tell you, and how do you handle the marathon question and the request for an injection?
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Persistent pain at 5 weeks without a discrete defect is most consistent with a reactive or degenerative Achilles or soleus tendinopathy rather than an untreated rupture. The important review is whether the loading program has actually been progressive - frequency, duration, and load - and whether he has continued to run through pain. A tendon that has not improved on an appropriate program, or has worsened, warrants repeat imaging to look for a partial tear, paratenon involvement, or a missed diagnosis.
Marathon: running 26.2 miles on a tendon that is still symptomatic at 5 weeks, in a patient with recent fluoroquinolone exposure, is a high-risk proposition. I would advise against it, or at minimum advise a run-walk strategy with a hard stop for pain that alters gait. The decision is his, but the counsel should be unambiguous rather than neutral.
Injection: I would not give a corticosteroid injection into or around the Achilles. It provides short-term relief at the cost of collagen synthesis, raises rupture risk - particularly stacked on fluoroquinolone exposure - and does not treat the underlying load intolerance. The appropriate interventions are load management, progressive eccentric or heavy-slow-resistance exercise, and patience. If he wants an adjunct, refer for a structured tendinopathy program rather than reaching for a syringe.