An analysis has been performed of the theories and postulates advanced by von Neumann, London and Bauer, and Wigner, concerning the role that consciousness might play in the collapse of the wave function, which has become known as the measurement problem.
giving out or weakness of the knees can have different causes. These can include problems outside the knee joint itself (weak muscles for example) or inside the knee (torn ligaments or cartilage). See an orthopaedic surgeon to address your individual problem.
If the knee swells this can cause swelling to the back of the knee which can cause an out pocketing which can cause pain from stretching of the tissue. Altered gait (walking)because of the associated knee pain and progressive limited range of motion causing further shortening of the calf muscles causing stiffness. . There are other reasons .