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Biomedical subjects

G Lord

Publications and source records attributed to G Lord.

At least 37 records · Page 2Linked to original sources
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↗
PubMed1982

[Comparative results of hip resection and coaptation for septic arthritis. Apropos of 36 cases].

The Girdlestone procedure was performed in 36 cases of septic arthritis of the hip, most of which arose following operation. In 21 instances, the greater trochanter was inserted into the acetabulum and the hips were fixed by external fixators. In 15 instances a standard operation was performed followed by traction. The results were better after simple procedures; there was less pain and more mobility but the hip was more unstable. It is concluded that the simple procedure is preferable especially when it is planned to perform a further arthroplasty later.

Adult↗
PubMed1981

Dreams, first memories, and brain atrophy in the elderly.

A five-year longitudinal study of the healthy aged was begun utilizing several measures. These include a sociological instrument, the Older Americans Resources Scale (OARS), psychological tests, physical and laboratory examinations, Computerized Transaxial Tomography (CTT), and a psychiatric interview. In the first year of the study 215 individuals over the age of 65 (average age 73) were examined, and preliminary data are now emerging. Among these are fantasy material in the form of dreams and first memories that were obtained in the psychiatric interview. We analyzed these data vis-à-vis brain scan results. In addition, we divided manifest dream content into the following types: (1) lost resources; (2) regressive; (3) real life; and (4) aggressive, sexual, and miscellaneous, and again analyzed the data along with the brain scan results. Similarly, first memories were analyzed. These are discussed in terms of utilizing fantasy material in order to determine the individual's perception of loss of cognitive ability, as a measure of personality structure, and to determine its relationship to the function of memory.

Aged↗
PubMed1980

[Airborne contamination and post-operative infection (author's transl)].

The authors have studied the rate of infection after 14000 orthopaedic interventions performed in the same hospital during the period between 1971 and 1978. 1020 of these were performed in a vertical air flow enclosure with a clearance of air at a rate of 425 times per hour. The others were performed in the conventional operating theatre with an air clearance of 22 times per hour. The density of particles was found to be 50 to 100 times lower at the level of the incision in cases operated on under vertical flow. Depsite this, the rate of infection was 0.7p. 100 in the conventional theatre and 1.4p. 100 in the vertical flow theatre. However, if the study was limited to hip prostheses (1382 cases), the rate of infection was about the same: 2,9p. 100 in conventional theatres and 3,2p. 100 in vertical flow enclosures. It is concluded that the role of a vertical air flow enclosure in decreasing the rate of post-operative infection in doubtful. The authors recall the effects of previous operations on liability to infection and consider that the use of cement may increase the incidence of infection. They advocate the use of cementless, self-locking total prostheses.

Air Microbiology↗
PubMed1979

[Upper tibial osteotomy for degenerative arthritis of the knee with varus deformity.-A review of 250 cases. (author's transl)].

The authors have reviewed 250 cases of upper tibial osteotomy for varus deformity of the knee with degenerative arthritis of the medial compartment. Most of the osteotomies (136) were closing osteotomies, the remainder being opening osteotomies using a bone graft. Closing osteotomy is recommended together with an arthrolysis of the upper tibio-fibular joint instead of a fibular osteotomy. Hyper-correction appeared to be beneficial in cases with lateral ligament laxity. The authors do not recommend intra-articular cartilage shaving or meniscectomy. They advocate surgical release of the patella by division of the lateral patellar retinacula or by anterior displacement of the tibial tuberosity.

Adolescent↗
PubMed1979

[A study of the potential corrosion of the madreporic prostheses compared with plane surface prostheses (author's transl)].

The authors have studied several methods of obtaining self-locking of hip prostheses without cement. They have selected a particular type of prosthesis with a "madreporic" surface and have studied the potential danger or corrosion in such types of prosthesis as compared with prostheses with a plane surface. They have demonstrated that, in madreporic types, the surface of the prosthesis is multiplied less than four times and that this is not dangerous provided that the metal alloy is of good quality. The methods of calculation of the surface area are described as well as experiments for testing for corrosion. These methods can be applied to other types of prosthesis.

Alloys↗
PubMed1978

[The fixation of madreporic total hip prosthesis; an experimental study (author's transl)].

The author has designed a new type of total hip prosthesis described as "madreporic" because its surface is rough and resembles some kinds of coral. This type of implant, which does not require cement, was tested on dogs. The bone-prosthesis junction was assessed using light and electron microscopy. Radio-spectrography and micro-radiography showed that osteogenesis occurred in the roughened surface of the implant leading to an early, strong and long-standing fixation. The prosthesis was inserted in two hundred patients. Five were removed after septic complications and one after premature death. The fixation with new bone to the surface of the metal was confirmed.

Alloys↗
PubMed1977

[Role of neck-head arthroplasty in the treatment of per-trochanteric fractures after the age of 70. Apropos of 140 cases].

The authors compare the results obtained in two series of trochanteric fractures in patients aged more than 70 years. In the first series, the fractures in 64 patients were all treated by nail-plate fixation. In the second series, fractures in 76 patients were treated either by nail-plate fixation (39 cases) or insertion of a prosthesis (37 cases). Prostheses were inserted in unstable fractures. It is concluded that, in all main respects, the results in unstable fractures were better after prostheses than after fixation. This finding is thought to be due to the greater speed of the operation and the possibility of early weight bearing.

Aged↗