A fixation assembly for quick-connect adjustable attachment of a prosthetic leg to an external ring fixator for immediate post-amputee ambulation. The device is configured for use with an existing external fixation assembly attached to a femur or tibia, and an existing prosthetic leg and foot combination of choice. The assembly generally includes an articulating fixator adjustably-attached to a monolithic support block by locking-ball-joint struts, and quick-connect pins insertable through the fixator and into receptacles on the locking-ball-joint struts for releasable attachment. The monolithic support block is a unitary block configured as a mounting base for mounting the prosthetic leg/foot support to its underside, and upwardly configured for weight-bearing attachment of the locking-ball-joint struts. The quick-connect pins allow releasable mounting to the existing external ring fixator.

An orthopedic system having a brace that includes a first component and a second component attached by a mechanical joint, an actuation assembly operably coupled to the first and second components so that activation of the actuation assembly causes movement of at least one of the components around the joint, a control unit interfaced with the actuation assembly so the control unit can send a signal to the actuation assembly, and a sensor operatively coupled to the control unit, the sensor capable of sensing a signal from a voluntary muscle contraction and then sending a signal to the control unit to activate the actuation assembly.

An orthopedic system wherein a patient's brain is operably coupled to an actuation assembly for voluntarily moving a brace/limb of the patient between a number of desirable positions. An orthopedic brace, or one of more components thereof, which can be utilized with the orthopedic system.