An adjustable prosthetic socket includes proximal and distal ends and an axis extending between the proximal and distal ends. A distal base is adapted to support a distal portion of a residual limb and is located at the distal end of the socket. At least one spine extends upwardly from the distal base toward the proximal end. The at least one spine defines at least part of a circumference of the socket about the axis. A proximal support is located at or near the proximal end of the socket and extends from the at least one spine. The proximal support is arranged to distribute pressure from the at least one spine over a portion of the residual limb. A tensioning system is operatively connected to the at least one spine and arranged to selectively adjust the circumference of the socket.
