An adjustable orthosis for, among other functions, flexing or extending a users joint, positioning a limb or digit during or after a surgical procedure, correcting foot drop due to soft tissue contraction, and augmenting soft tissue during weight bearing therapies. In a preferred form, the orthosis includes a padded shell adapted to be worn on a user's limb and a distal support to be worn on one or more digits of the hand or foot or on the forefoot or body of the hand. The padded shell is connected to the distal support solely via an elastic member such as surgical tubing, which also applies a tension force between the two supports. One end of the elastic member carries teeth that mate with a ratcheting device that permits the wearer (1) to gradually increase the tension between the supports and (2) to quickly release the tension.