In a biomechanical analysis of the forces transmitted to an amputated limb by a below-knee patellar-tendon-bearing prosthesis, R@di% (1) showed in 1962 that the principal forces occur in the patellar ten bn, the distal anterior tibial, the latera tibial condylar, and the medial tibial condylar regions. Apparantly the design of this prosthesis was such that the forces were directed to those area...

OBJECTIVES The objective of this study was to compare the early migration characteristics and functional outcome of the Triathlon cemented knee prosthesis with its predecessor, the Duracon cemented knee prosthesis (both Stryker). METHODS A total 60 patients were prospectively randomised and tibial component migration was measured by radiostereometric analysis (RSA) at three months, one year a...

If below-knee amputation is impossible, knee disarticulation should be considered before above-knee amputation, regardless of age and etiology. Knee disarticulation which leaves the femur and patella untoched offers many advantages. The surgical technique is simple and non-traumatic since no bone or muscle tissue is to be dissected. The thigh muscles are completely preserved and thus there is n...

This paper describes the preliminary results of a proximal tibial endoprosthesis which spares the knee joint and enables retention of the natural articulation by replacing part of the tibial metaphysis and diaphysis. In eight patients who had a primary malignant bone tumour of the proximal tibia, the distal stem, which had a hydroxyapatite-coated collar to improve fixation, was cemented into th...

We quantify how the hip energetics and knee torque required for an above-knee prosthesis user to walk with the kinematics of able-bodied humans vary with the inertial properties of the prosthesis. We also select and optimize passive mechanical components for a prosthetic knee to accurately reproduce the required knee torque. Previous theoretical studies have typically investigated the effects o...

We quantify how the hip energetics and knee torque required for an above-knee prosthesis user to walk with the kinematics of able-bodied humans vary with the inertial properties of the prosthesis. We also select and optimize passive mechanical components for a prosthetic knee to accurately reproduce the required knee torque. Previous theoretical studies have typically investigated the effects o...

1 School of Medicine, University of Miami, Jackson Memorial Hospital, Miami, Fla. 33152. Greater knowledge and understanding of bioengineering by the prosthetics and orthotics industries during the past twenty years have resulted in the development of highly functional and sophisticated appliances. For example, modern prostheses for lowerand upperextremity amputees are now designed with proper ...

The swing-phase motion of the shank of an above-knee prosthesis has been modelled mathematically. An inexpensive endoskeletal prosthesis was designed using the Jaipur foot and conduit pipes with a hinge joint for the knee. Results of field trials and the modelling indicate that a very simple above-knee prosthesis can give near normal gait at "normal" walking speeds on flat surfaces. The swing o...

One of the most important factors that causes the failure of a knee prosthesis is the infection that can arise in the tissues after implantation due to an incorrect surgical procedure, to a difficult repairing process or to other patient’s pathological conditions. The infection can arise soon after implantation as well as in one or two years after the operation. In order to let the infection he...

The Motion Foot is a new foot/ankle system that offers near-normal ankle range of motion via a hydraulic ankle (ROM = 50 deg), paired with an energy-storing foot plate. This system has been developed to offer to above-knee and below-knee prosthesis wearer: 1) improved comfort, 2) reducedloads on proximal joints and 3) improved stability. Improved comfort and reduced proximal joint loading is ac...