Periprosthetic fractures after total knee arthroplasty may occur in any part of the femur, tibia and patella, and the most common pattern involves the supracondylar area of the distal femur. Supracondylar periprosthetic fractures frequently occur above a well-fixed prosthesis, and risk factors include anterior femoral cortical notching and use of the rotational constrained implant. Periprosthet...

This study reports on 7 patients who underwent a new technique for Chopart amputation that includes ankle and subtalar arthrodesis using an intramedullary nail. This method affords rigid control to the rearfoot and appears to avoid the most common complications historically associated with Chopart amputations. All 6 surviving patients achieved successful outcomes within 1 year of their surgery....

PURPOSE To compare the outcome of fixed-bearing posterior-stabilised versus cruciate-substituting prostheses in 46 patients who underwent primary bilateral total knee replacement (TKR). METHODS Records of 35 women and 11 men aged 54 to 78 (mean, 67) years who underwent primary bilateral TKR for osteoarthritis (n=44) and rheumatoid arthritis (n=2) were retrospectively reviewed. A fixed-bearing...

The evaluation of contact areas and pressures in total knee prosthesis is a key issue to prevent early failure. The first part of this study is based on the hypothesis that the patterns of contact stresses on the tibial insert of a knee prosthesis at different stages of the gait cycle could be an indicator of the wear performances of a knee prosthesis. Contact stresses were calculated for a mob...

Rotating hinge knee prostheses have been developed as an advancement of the fixed hinge models. Some authors suggest that this type of prosthesis is associated with a greater risk of aseptic loosening because of the increased stresses to the bone-prosthesis interface; therefore, they are scarcely used as primary implants. The current authors evaluated of a series of 98 rotating hinge knee arthr...

This article presents a virtual prototyping study of a semi-active lower limb prosthesis to improve the functionality of an amputee during prosthesis-environment interaction for level ground walking. Articulated ankle-foot prosthesis and a single-axis semi-active prosthetic knee with active and passive operating modes were considered. Data for level ground walking were collected using a photogr...

Objective: Few studies have described the complications leading to transfemoral amputation after total knee arthroplasty. The aim of this study was to demonstrate which long term prosthesis-related complications can lead to the loss of a limb after knee joint replacement and to provide clinical guidance regarding the situations that generate an increased likelihood of a patient requiring above ...

Abstract As the essential technology of human-robotics interactive wearable devices, robotic knee prosthesis can provide above-knee amputations with functional compensations to realize their physical and psychological social regression. With development mechanical mechatronic science technology, fully active that subjects actuating torques has demonstrated a better wearing performance in slope ...

This study reports an investigation into the effect of shoe mass on the gait patterns of below-knee (BK) amputees. Ten established unilateral BK, patellar-tendon-bearing prosthesis wearers were assessed using a VICON system of gait analysis. Incremental masses of 50g (up to 200g) were added to the subjects' shoes and data captured as they walked along a 15m measurement field. Coefficients of sy...