The planning of the hip prosthesis surgical operation is usually performed manually by the surgeon, who ‘draws’ on a patient’s X-ray image the outline of the prosthetic stem in order to choose the one most suitable for the case at hand. In an attempt to give some repeatability and objectivity to the planning phase, a procedure has been devised for hip prosthesis’ stem selection based on the ext...

BACKGROUND Total hip arthroplasty is a successful surgery, that fails at a rate of approximately 10% at ten years from surgery. Causes for failure are mainly aseptic loosening of one or both components partially due to wear of articular surfaces and partially to design. The present analysis aimed to identify risk factors and quantify their effects on aseptic failure. METHODS Multivariate surv...

PURPOSE To compare and combine dual-energy based and iterative metal artefact reduction on hip prosthesis and dental implants in CT. MATERIAL AND METHODS A total of 46 patients (women:50%,mean age:63±15years) with dental implants or hip prostheses (n = 30/20) were included and examined with a second-generation Dual Source Scanner. 120kV equivalent mixed-images were derived from reconstruction...

We present a case of inner head dislocation 11 years after the replacement of a bipolar prosthesis with a self-centering system. An 84-year-old woman with osteoarthritis of the left hip underwent a replacement of the Bateman UPF-II bipolar prosthesis in 1987. She fell off a chair on April 19 1998, and felt a sudden sharp pain in the left hip. Roentgenograms revealed that the inner head was disl...

OBJECTIVE This retrospective study was carried out to determine the typical patterns of (18)F-FDG uptake in uncomplicated total hip arthroplasty (THA). SUBJECTS AND METHODS (18)F-FDG-PET images of 62 asymptomatic THA patients who had undergone whole body scanning were evaluated for this retrospective study. The uptake was assessed qualitatively as positive or negative in the head/neck and the...

INTRODUCTION Actinomyces bacteria are part of the human oropharyngeal microbiota. They have been associated with abdominal, cervicofacial and thoracic infections and a few cases of joint infections have also been described. In particular, Actinomyces gerencseriae, formerly described as Actinomyces israelii serovar II, has rarely been associated with human infections, mostly involving cervicofac...

The Birmingham Mid Head Resection (BMHR) arthroplasty can be used as an alternative to conventional stemmed total hip arthroplasty in young patients unsuitable for hip resurfacing. This study investigated the effect of stem size on femoral neck fracture in the BMHR. Sawbones composite femurs were randomly allocated to one of the following groups: 1) Unprepared femur with no prosthesis; 2) Femur...

BACKGROUND AND PURPOSE Using a cane held contralateral to a prosthetic hip is presumed to be an effective way to reduce the demands on the hip abductor (HA) muscles and, therefore, the forces on the implant. In this study, surface electromyographic (EMG) activity was measured from the HA muscles to test this notion. SUBJECTS Twenty-four active subjects (9 female, 15 male) with unilateral pros...

BACKGROUND Hip and knee replacement are some of the most frequently performed surgical procedures in the world. Resurfacing of the hip and unicondylar knee replacement are increasingly being used. There is relatively little evidence on their performance. To study performance of joint replacement in England, we investigated revision rates in the first 3 y after hip or knee replacement according ...

A ceramic-on-ceramic (CoC) hip prosthesis with clearance is modeled as a multibody dynamics system for the purpose of studying hip squeaking. A continuous contact force model provides the intrajoint forces developed at the hip joint. Friction effects due to the relative motion are also considered. A FFT analysis of the audible sounds from CoC hip acceleration is carried out to analyze hip squea...