Examining the effects of bad and  good fitting conditions supracondylar PTB socket on interface pressure and comfort of unilateral transtibial amputees: Case Study

Changes in the volume and shape of the stump causes difficulties in maintaining A comfortable and exact fit. Improper fit causes pain، discomfort and movement between stump and socket. There is not enough document to identify how much volume fluctuation causes fitting problem To identify and understand the relationship between the changes of interface pressure between stump and socket with mentally feeling of amputees in «good» and «bad» fitting conditions. Method and Material: The study was conducted on two below knee amputees. The method has 2similar stages، SCS was evaluated at both stages with the difference that one was done in bad and other in good fitting condition. To examine stump-socket interface pressure at each stage،static tests with applying half and full body weight to the artifical limb and walking tests were done. With volume reduction، it seems adding several sock layers to improve fitting condition (force couple correction) imposes high interface pressure to patellar tendon and fibular head which lowers amputees feeling of comfort. Without adding sock layers،stump movement to distal causes unbearable pressure to the distal of tibia. In static tests، interface pressure increased in good fitting condition at patellar tendon and popliteal region. Walking tests in good fitting condition showed less movement between stump and socket and less improper pressure. Using too many layers of socks to improve fitting causes intolareable interface pressure at regions such as petellar tendon and fibular head.