Permanent and total disability means that the individual has some physical or mental
                  impairment, disease, or loss from which recovery or substantial improvement cannot
                  be expected, and which substantially precludes him from engaging in any occupation
                  within his competence, such as holding a job or homemaking.
               
               To be eligible for PTD a person must be “permanently and totally disabled” (subsection (2), Section 208.051, R.S. Mo. 1949). In addition, the following Statement
                  on the same subject is contained in sub-section (4) of the same section: “Who is disabled by illness, injury, or other physical or mental impairment which is
                  medically determinable and can be expected to be of long-continued and indefinite
                  duration or to result in death.”