A system for a knee joint includes a first fastener and a second fastener operable to be connected to the tibia and femur, respectively. Furthermore, the system includes a flexible prosthetic ligament member. The ligament member is operably coupled to the first and second fasteners to support the tibia and the femur for relative movement. The ligament member extends from a first end to a second end, and includes an outer wall that defines a hollow longitudinal passage portion. The first end extends into and out of the longitudinal passage portion through the outer wall to define a first adjustable loop, and the second end extends into and out of the longitudinal passage portion through the outer wall to define a second adjustable loop.