Patellar maltracking results in many patello-femoral joint (PFJ) disorders, usually source of anterior knee pain. In the intact knee, this maltracking is generally due to abnormalities in the PFJ interface, soft tissue tightening and lower limb rotations. In the replaced knee, PFJ maltracking is generally due to prosthesis component misalignments in both PFJ and tibio-femoral joint (TFJ), inacc...

The paper describes the design and control of a transfemoral prosthesis with powered knee and ankle joints. The initial prototype is a pneumatically actuated powered-tethered device, which is intended to serve as a laboratory test bed for a subsequent self-powered version. The prosthesis design is described, including its kinematic optimization and the design of a three-axis socket load cell th...

Background. Our study aimed to analyze retrospectively the locomotion performance in patients following below-the-knee amputation (BKA) for atherosclerotic critical limb ischaemia (CLI) in relation to factors which may influence the final outcome. Material and methods. Two groups of patients were analyzed: Group I (n = 53), which underwent fitting of prosthesis and rehabilitation immediately af...

The problems encountered in fitting and using the permanent below-knee prosthesis in developing countries are the high price of the prosthesis, inadequate fitting and lack of proper rehabilitation. In Turkey, the preferred treatment of the stump post-operatively is by the soft dressing method with bandaging for maturation and shrinkage. Generally, the application of the permanent prosthesis is ...

Current powered prosthetic legs require switching control modes according to the task the user is performing (e.g. level-ground walking, stair climbing, walking on slopes, etc.). To allow prosthesis users safely and seamlessly transition between tasks, it is critical to determine when to switch the prosthesis control mode during task transitions. Our previous study defined critical timings for ...

Total knee arthroplasty (TKA) is a very successful procedure, but pain or difficulties during activities still persist in patients. Patient outcomes in TKA surgery can be affected by implant design, alignment or patient-related anatomical factors. This paper presents a numerical sensitivity analysis of several TKA types: a fixed bearing, posterior stabilized prosthesis, a high flexion fixed bea...

The electromyographic signal is the electrical manifestation of the neuromuscular activation associated with a contracting muscle. The surface electromyographic (SEMG) signal represents the current generated by ionic flow across the membrane of the muscle fibers that propagates through the intervening tissues to reach the detection surface of an electrode located over skin (De Luca (2006)). The...