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Treatment of Bone Marrow Edema of the Talus with Pulsed Electromagnetic Fields
Outcomes in Six Patients
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Background
Bone marrow edema (BME) of the talus is a rare, mostly self-limiting cause of foot and ankle pain. We sought to investigate in patients with idiopathic BME of the talus the effectiveness of pulsed electromagnetic fields and to determine the effect of this therapy on magnetic resonance imaging findings.
Methods
Six patients with BME of the talus confirmed by magnetic resonance imaging were enrolled. Pain was quantified with a visual analog scale from 0 (no pain) to 10 (the worst pain imaginable). The clinical outcome was assessed using the American Orthopaedic Foot and Ankle Society scoring system. Treatment consisted of pulsed electromagnetic field stimulation 8 h/d for 30 days. The device used generated pulses 1.3 milliseconds in duration, with a frequency of 75 Hz and a mean ± SD induced electric field of 3.5 ± 0.5 mV.
Results
The mean American Orthopaedic Foot and Ankle Society score improved from 59.4 (range, 40–66) before treatment to 94 (range, 80–100) at the last follow-up. The visual analog scale score decreased significantly from 5.6 (range, 4–7) before treatment to 1 (range, 0–2) at the last follow-up. Magnetic resonance imaging showed that BME improved after 1 month of treatment and resolved completely within 3 months in 5 patients, with normal signal intensity and no signs of progression to avascular necrosis.
Conclusions
A significant reduction in BME area was associated with a significant decrease in pain within 3 months of beginning treatment.
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