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Biomedical subjects

T Husby

Publications and source records attributed to T Husby.

27 records · Page 2Linked to original sources
PubMed1989

Early loss of fixation of femoral neck fractures. Comparison of three devices in 244 cases.

In successive series of displaced subcapital femoral neck fractures in the elderly, we operated on 75 cases with three Gouffon screws, 94 with three Mecron screws, and 75 with two von Bahr screws. Redisplacement within 3 months occurred in 20 Gouffon cases, 11 Mecron cases, and 12 von Bahr cases. Poor reduction contributed to the failures in all the groups. Although the reduction results in the three groups were similar, the Mecron group had better fixation and better social recovery than the Gouffon group. We concluded that, in addition to good reduction of the fracture, solid screws also contributed to the stability of the bone-implant construct.

Aged↗
PubMed1989

Bone-mass distribution in the femur. A cadaver study on the relations of structure and strength.

We measured the bone density and volume in the femoral head, cervicotrochanteric, midshaft, and condylar regions by quantitative computed tomography of the femora of 26 elderly cadavers. We also measured the shearing force at fracture of the femora in axial bending; 25 fractures occurred vertically in the neck and only one in the shaft. The bone mass-related measurements, calculated as the product of bone density times volume, increased steadily from the femoral neck down to the condyles. The bone densities of males and females did not differ, whereas the bone volumes were higher in males. Several correlations were found between the ultimate shearing force of the cervical trabecular/cortical bone and cortical and cancellous bone densities in different locations of the femur. The ultimate shearing force was correlated with the bone mass in all the locations.

Absorptiometry, Photon↗
PubMed1988

Femoral bone density measurements by single energy computed tomography related to hip fractures.

We measured bone density in various parts of the femur by using single energy quantitative computed tomography. In the cadaver studies we found significant correlations between the trabecular and cortical bone density and the structural strength of the femur in bending and rotational loading. This was observed in parts of the femur distant from the fracture site in the femoral neck. Good reproducibility of the density measurements was obtained at the condylar level, a site easily accessible for clinical measurements. In a clinical study, we could record post-traumatic osteoporotic changes at 5% precision level.

Absorptiometry, Photon↗
PubMed1988

Bone mineral content and mechanical strength. An ex vivo study on human femora at autopsy.

Bone mineral content as determined by computed tomography (CT) and mechanical strength on axial loading were compared in 36 cadaveric femur specimens. In axial loading, 34 femora fractured vertically in the neck, one femur fractured subtrochanterically, and one in the shaft. Based on the CT measurements of density and area, the mass of a transverse slice of the femur was estimated. Highly significant correlations were demonstrated between strength and cancellous bone density. Even higher correlations were revealed when the bone masses of the proximal and distal femoral areas were calculated. Based on these findings, an equal distribution of the effective mass of the femur was postulated.

Adult↗
PubMed1987

Strength of femoral neck fracture fixation. Comparison of six techniques in cadavers.

A neck osteotomy parallel to the femoral shaft was made on 36 cadaveric femora using the contralateral intact femur as a control. The osteotomies were fixed using a Thornton nail, two von Bahr screws, three Gouffon screws, three Knowles pins, a Haukebø compression screw, or an AO compression screw. The femora were then tested for bending strength using the load ratio test/control at 2- and 5-mm displacement as an expression of the relative strength of the osteosynthesis. There was no difference between the von Bahr, Haukebø, and the AO screws. These implants gave stronger fixation than the Thornton nail, Gouffon screws, and Knowles pins. The Thornton nail was stronger than three Gouffon screws or Knowles pins. The relatively stronger compression hip screws were thus not superior to two optimally placed 5-mm screws.

Aged↗
PubMedDate not supplied

Are patients with fractures of the femoral neck more osteoporotic?

Combined cancellous/cortical density and mass in the femur and lumbar spine were assessed 2 or 3 days after femoral neck fractures and compared to identical measurements in control subjects. Cancellous density was also assessed in the spine. Correction for age differences between patients and controls were made by means of regression analyses and by selecting groups without age differences. After compensation for the age differences, the patients were found to have significantly lower femoral bone mass and lumbar density than the controls. The femoral density and lumbar mass density were not significantly different in the two groups after age correction. The findings for the cancellous spinal density was equivocal. The study indicates that in the femur the total bone mineral content is lower in patients with femur neck fractures and that it is at least one of the etiological factors of these fractures. However, in the femur it is not the bone density that is the decisive factor, but the amount of calcified bone, or the bone mass.

Age Factors↗