Harvey Dobbs

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  • H S Dobbs
  • The Journal of bone and joint surgery. British…
  • 1980
The survivorship of total hip replacements in patients operated on at the Royal National Orthopaedic Hospital has been analysed using standard actuarial methods. Between 1963 and 1972 173 metal-on-metal prostheses of various developmental designs were inserted. Between 1969 and 1972 248 prostheses of one design using a metal femoral component and plastic(More)
The concentration of cobalt (Co), chromium (Cr), molybdenum (Mo), nickel (Ni), iron (Fe) and zinc (Zn) was measured using neutron activation analysis in tissue taken from an 81 year old female at necropsy. The patient had bilateral cobalt chromium molybdenum (Co-Cr-Mo) total hip replacements: one, a metal-on-metal had been in place for 14 years, the other a(More)
The density, ash content and hardness were determined for ultra high molecular weight polyethylene from a single block of medical grade RCH 1000. The effect on these parameters of position within the block and of 2.5 Mrad irradiation was determined. The density was 942 +/- 1 kgm-3. It varied slightly with position and increased slightly after irradiation.(More)
A series of 81 patients has been reviewed to determine the value of endoprosthetic replacement of the proximal femur and hip in the treatment of bone tumours. Standard statistical methods were used to evaluate the survival of the replacements and the patients. Taking removal of the prosthesis, irrespective of the cause, as the criterion for failure the(More)
This article presents data on the incidence of rub marks (burnishing) on the stems of 180 removed total hip replacement femoral components most of which were McKees and Stanmores. The incidence varied with the reason for removal. It was low for assorted removals excluding fractured stem removals, higher for "loose stem" removals, and highest for fractured(More)
A total hip replacement femoral component was embedded using acrylic bone cement into a full length model femur consisting of a thin-walled cylindrical fixture and was loaded anatomically. The strains in the prosthesis, the fixture and the cement were determined as was the effect of prosthesis misorientation. This method of fixation, unlike others tested,(More)
The paper presents a probability model for the fracture of femoral components based on the assumption that the components are defect-free, and that they fracture by a fatigue process. The model predicts the probability of fracture for patients of different body weight, and the incidence of fractures versus body weight, and versus time. The results are(More)
We consider the effect that a directed migration of adatoms, such as that which arises due to an externally applied electric field, bas over the morphology of a crystal surface. Applying linear stability arguments to a continuum model we find that the stability of a surface is determmed by the depeiidence of the adatom mobility on the surface orientation.(More)