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Biomedical subjects

G Lord

Publications and source records attributed to G Lord.

At least 19 recordsLinked to original sources
PubMed1988

[Madreporic, polarized total arthroplasties of the hip. Apropos of 2688 cases].

This paper reports an experience over ten years with cementless total hip arthroplasty in a series of 2688 personal cases commencing in 1975. Stress is laid on the results over a period greater than 5 years and up to 10 years as much on the long-term effects on the host bone as on the implant itself. The causes of failure of biological anchorage by endosteal osteogenesis are analysed. Various phenomena, particularly the reaction of the cortices to stress, several cases of bony resorption with debris due to wear and fatigue fractures of the stem of the prosthesis have been seen. These and the problems posed by the occasional need for extraction have led to the progressive development of the prosthesis, resulting in 1983 in a new type of anchorage with a polarised surface and a better-balanced prosthesis in relation to stress and extractability.

Adult↗
PubMed1988

Cementless revisions of failed aseptic cemented and cementless total hip arthroplasties. 284 cases.

Over the past 13 years, 284 revisions of aseptic total hip arthroplasty failures have been performed with cementless implants. There were 213 cases involving cemented implant failures and 71 involving cementless ones. Considered as salvage procedures, these revisions provided a satisfactory result in about 70% of the reviewed patients after five years. A biologic fixation by bony ingrowth can be expected under certain conditions from decorticated living bone, a tight mechanical fitting, and a retentive corrugated surface of the implant. A prosthetic reimplantation, safely done without cement, appears more economical for the bone stock and prevents the long-term complications related with cement. Bone grafts are often required but cannot ensure the incoming osteogenic fixation of the implant. Long-term results and complications mandate harmless extractability of the revisional implant, a forged stem, an easy exchange of the plastic liner (in a two-part acetabular component), and an updated low-friction system (high-density polyethylene wear being a potential long-term problem).

Asepsis↗
PubMed1985

[Preventive antibiotic therapy and postoperative infection in orthopedic surgery. 1983 total hip prostheses].

In a previous paper the authors studied the role of aerobio-contamination in the rate of post-operative infections. In the present study, the results of 1,172 total hip prostheses performed between 1979/1982 with prophylactic antibiotics were compared with those obtained in 811 cases performed before 1979 without antibiotics. In the 1979/1982 series, there was 0,5 p. 100 of post-operative infection and in the pre- 1979 series, 3,3 p. 100. During the two periods the peri-operative environment was identical and the surgical technique was the same. The rate of infection in more than 8,000 other surgical procedures performed in the same hospital remained the same. The use of prophylactic antibiotics appears to be a valid approach. They should be used only in high-risk procedures to avoid the selective production of resistant organisms.

Adult↗
PubMed1985

[Chiari's osteotomy in adults. Apropos of 72 cases].

The authors have performed 65 Chiari osteotomies in adults. The results have been studied with a follow-up ranging from one to 12 years. Details of the surgical technique are described. Fifty-three cases have had satisfactory results. Forty-five cases have a follow-up of more than 5 years and among these, 38 still have a very satisfactory result. It is concluded that Chiari osteotomy may stop the development of early arthrosis clinically as well as radiologically in more than two-thirds of dysplasias or subluxations in patients younger than 50 years. When there is associated femoral dysplasia it should be corrected either simultaneously or preceding the osteotomy.

Adult↗
PubMed1984

Calculation of life tables from survey data: a technical note.

Life table calculations from survey data are frequently based on events for which exact dates are not available. When these dates are coded in monthly form (e.g., century months), estimates should take into account the fact that the first duration interval--the interval which captures events occurring in the first month of exposure--is half the length of all remaining intervals. Although failure to do so has a trivial effect on many demographic calculations, estimates which are based on events which occur with high frequency in the first few months of exposure can be substantially biased. Estimates of fecundability for four countries in the World Fertility Survey are used to illustrate this bias.

Actuarial Analysis↗
PubMed1983

The madreporic cementless total hip arthroplasty. New experimental data and a seven-year clinical follow-up study.

During the period from February 1975 to January 1, 1982, 1509 cementless total hip arthroplasties were performed employing madreporic prostheses. A previous study (1979) introducing this type of rough-surfaced implant and discussing the main requirements for a biologic cementless anchoring included new experimental data about the acetabular component, the threaded ring, indications, complications, and clinical results. A full assessment of the madreporic prosthesis must await ten-year follow-up data, but in view of the good results to date and the increasing incidence of failure with cemented prostheses, surgical cement may be unnecessary for many hip arthroplasties.

Adult↗
PubMed1983

Sex differences in life cycle measures of widowhood.

Using formulas which measure life cycle characteristics of widowhood as a function of life table survivorship and age at marriage, we illustrate changes in patterns of widowhood and widowerhood since 1950, as well as differences by race, by age of bride and of groom, and by age differences between spouses. Although the current inequality in the risks of widowhood and widowerhood for the average couple is mostly due to sex differences in mortality, a one year age difference between spouses has about the same impact as does a one year difference in life expectancy. Calculations based on current distributions of age of groom by age of bride indicate that the older the age of groom, the greater the age difference between spouses and the higher the likelihood of a woman outliving her husband: the typical groom who marries in his fifties faces a 4 to 1 chance that he will be outlived by his spouse.

Adult↗
PubMed1982

[Combined fracture-dislocation of both bones of the forearm at the elbow (author's transl)].

The authors have studied a particular type of traumatic lesion of the elbow which combines a fracture of the olecranon with a dislocation of both bones of the forearm, the radius and ulna remaining normally aligned to one another. The displacement was either forward (4 cases) or backward (6 cases). In some cases a partial fracture of the radial head or the lateral condyle of the humerus was also present and resulted in considerable instability. Internal fixation should always be tried but was not always possible. In one case a pedicle transplant of the medial epicondyle was made to restore a fractured coronoid process.

Adult↗
PubMed1982

[Replacement of loose cemented total prosthesis of the hip by cementless prosthesis of the madreporic type (author's transl)].

The authors have inserted 77 cementless prosthesis of the madreporic type in cases of loosening of previously-inserted cemented prosthesis. 66 p. 100 of satisfactory results have been obtained with a follow up of one to six years. The analysis have shown that those with good results achieved stability in the course of time. The technique is fully described. In some cases bone grafting was necessary. In five cases a fracture of the femur was done during the operation. The possibility of a flare-up of infection is discussed. The authors consider that the absence of cement diminishes the liability to septic complications.

Acetabulum↗