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Biomedical subjects

I G Stother

Publications and source records attributed to I G Stother.

10 recordsLinked to original sources
PubMed1991

Variation in applied force during insertion of cemented femoral prostheses.

Information is presented on forces applied to cemented prostheses during insertion. An instrumented femoral pusher was used to collect information during simulated operations on cadavers while using a laboratory test rig and during live surgery. Surgeons using flanged or collared prostheses tend to apply more force than those using collarless prostheses. There is a tendency for abrupt changes in applied force to occur when: 1) clearing cement; 2) easing hand discomfort; and 3) testing cement consistency. Tests showed that an overall impression of the force applied could be obtained from a laboratory simulation, but that clearing cement and testing cement were not modelled by this method. We discuss the implications of our observations in terms of prosthesis fixation and training of staff.

Biomechanical Phenomena↗
PubMed1990

Arthroscopy.

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Arthroscopes↗
PubMed1990

Biomechanical stability of four-part intertrochanteric fractures in cadaveric femurs fixed with a sliding screw-plate.

Three factors affecting the stability of four-part intertrochanteric fractures were considered; the type of reduction, the quality of bone as assessed by the Singh Index, and the position of the sliding screw within the head fragment. The stability of two different reductions of four-part intertrochanteric fractures created in paired cadaveric femurs was tested after fixation with sliding screw-plates. Cyclic loading over the range 1-6 times body weight was used to simulate physiological forces. The same loading regimen was applied to femurs with deliberately misplaced implants. Bone quality did not affect the incidence of failure. The type of reduction did not affect the incidence of failure, although it affected the mode of failure. Misplacing the implant greatly impaired the stability of the fracture. Thus, to minimize the risk of disruption of the reduced fracture every attempt must be made to ensure that the tip of the nail or plate lies between 5 and 12 mm from the subchondral bone of the femoral head and the shaft of the device in the central third of the neck on both anteroposterior and mediolateral radiographs.

Biomechanical Phenomena↗
PubMed1990

Peak pressures in the forefoot.

We used a high frequency response, ultra-thin transducer to measure forefoot pressures at predetermined sites on the sole of the foot in 10 normal subjects. We demonstrated impact pressure peaks, which have not previously been identified, and which were separate from the roll-off peak. We report preliminary results on the effect of various forms of footwear and insoles on sub-pedal pressure during walking.

Adult↗
PubMed1989

Some factors affecting the strength of the cement-metal interface.

A manufacturing technique to increase the bonding between bone cement and metal prostheses has been assessed in the laboratory by "push-out" tests, and the effects of contamination of the cement and of the prosthesis with blood and intramedullary contents have been studied. The technique, known as pre-coating, increases bond strength; this increase is preserved after contamination of the cement which does, however, cause some lowering of interface shear strength. The implications for clinical practice are discussed.

Bone Cements↗
PubMed1976

Carpometacarpal dislocation of the little finger.

A case is reported of dislocation of the base of the fifth metacarpal treated by manipulation and percutaneous fixation with a Kirschner wire. Visualisation by the image intensifier confirmed the reduction. A lateral view is important to control the volar displacement.

Carpal Bones↗