O.T.D. This is, without a doubt, the best traction device on the market. With the O.T.D. oPTIMUM TRACTION DEVICE, you never need to roll your patient or raise their leg when applying. Unlike other traction devices, only the OTD allows the ability to work around any hip or groin trauma. Furthermore, there is no ischial bar to deal with, so any concerns of causing unnecessary pressure and additional pain are not an issue. A single person can properly apply the OTD in less than one minute.