PLIMF therapy uses magnetic fields to increase oxygen levels and decrease toxic by-products of inflammation by increasing local blood flow (Durovic et al. 2009).
Durovic et al. (2009) randomly assigned 29 SCI patients to a control group or treatment group. Both received range of motion and exercise therapy; however, only the treatment group received PLIMF therapy an average of seven weeks post injury for four weeks. The study showed no incidence of HO in the treatment group yet a 33% incidence in the control group (p<0.04).
There is Level 1b evidence (from one RCT: Durovic et al. 2009) that Pulse Low Intensity Electromagnetic Field therapy is an effective prophylaxis of HO post SCI.