A brace includes a frame having first and second sections defined by a clearance, a rotary ratcheting mechanism connected to the frame, and an elongate tensioning element having a first end secured to the ratcheting mechanism and a second end connected to the frame. The ratcheting mechanism is configured for unidirectional incremental adjustment in distance in a first direction of the second end of the tensioning element relative to the ratcheting mechanism, and includes a release device configured to release the tensioning element relative to the ratcheting mechanism in a second direction relative to the ratcheting mechanism.