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Biomedical subjects

R Onnerfält

Publications and source records attributed to R Onnerfält.

35 records · Page 2Linked to original sources
PubMed1990

Improved positioning of the femoral stem with a centralizing device.

Two series of patients operated on with total hip replacements for arthrosis are reported. The same prosthesis and operative and cementing techniques were used in both series, except that in Series 2 a centralizing device consisting of four triangular fins passed over the tip was also used to improve the positioning of the femoral stem. It was found that the position of the tip was more central in Series 2. No drawbacks were associated with the use of the device. We concluded that the centralizing device facilitated the positioning of the femoral stem tip.

Adolescent↗
PubMed1989

Stable pubic fractures in the elderly. The association with sacro-iliac injuries.

A consecutive series of 17 elderly patients with radiological or clinical suspicion of pubic fractures were investigated with bone scintigraphy using 99mTc-methylene diphosphonate. All had an increased isotope uptake over the pubic bone and also over the sacro-iliac region, except in one patient where the sacro-iliac uptake could not be assessed. The isotope uptake was slightly increased in nine patients and markedly so in seven. Computed tomography was performed in three cases. In two who showed a marked increased isotope uptake, fractures adjacent to the sacro-iliac joint could be demonstrated, and in one with only slightly increased uptake, no fracture was found.

Aged↗
PubMed1988

Physiotherapy after total hip replacement for primary arthrosis.

Organized physiotherapy starting two months after uncomplicated total hip replacements for primary arthrosis did not improve the rehabilitation. Six months after surgery there were no significant differences between 14 patients with and 16 patients without physiotherapy regarding improvement of passive hip motion, or hip or knee muscle strength of the operated limb. Neither were there any differences in walking ability or activities of daily living.

Activities of Daily Living↗
PubMed1987

Cefuroxime prophylaxis in trochanteric hip fracture operations.

In a double-blind randomized study of antibiotic prophylaxis in trochanteric fractures operated on with a nail and plate, a 24-hour intravenous administration of cefuroxime 0.75 grams thrice daily (Group B) was compared with the previous regimen of cefuroxime for 24 hours plus 6 days of oral cephalexin (Group A). In each group, 56 (Group A) and 65 (Group B) patients could be evaluated. One deep infection occurred in Group B with growth of Staphylococcus aureus, and another 4 patients had discharge and cultures of which 2 showed S. aureus. In Group A, 6 patients had signs of an infection, and in 3 patients cultures were taken but were negative. There were no differences between the groups. We concluded that the prophylaxis time need not be longer than 3 days.

Aged↗
PubMed1987

Fracture of hip prostheses due to inadequate welding.

Twenty-five patients underwent total hip arthroplasty using a copy of a well-known prosthesis during the period 1974-1976. Five of the prostheses fractured through the neck after 5-12 years. There were no prodromal symptoms and no trauma preceded the fractures. Technical analysis revealed that inadequate welds were responsible.

Aged↗
PubMed1987

Low- versus high-viscosity bone cement. Fixation of hip prostheses analyzed by roentgen stereophotogrammetry.

Sixteen patients were examined by roentgen stereophotogrammetry during the first year after total hip arthroplasty. Eight prostheses were fixed with low-viscosity and eight with high-viscosity cement. Eight acetabular components, four in each group, migrated cranially, and three femoral components, all in the low-viscosity group, migrated distally. Our findings suggest that low-viscosity cement does not improve prosthetic fixation.

Bone Cements↗
PubMed1986

Mechanical loosening of total hip prostheses. A radiographic and roentgen stereophotogrammetric study.

Twenty patients were examined by standard radiography and roentgen stereophotogrammetric analysis (RSA) during a two-year period after total hip arthroplasty. Eleven of the acetabular components migrated cranially and three femoral components migrated distally. This migration was most rapid during the first four months after operation. Our findings support the possibility that mechanical loosening is initiated by thermal injury during polymerisation of the cement; the less frequent migration of the metallic femoral component compared with the polyethylene acetabular component may be because the metal acts as a heat sink. Standard radiographs were inadequate for assessment of early mechanical loosening, whereas RSA could reveal migration within four months of the arthroplasty.

Follow-Up Studies↗
PubMed1985

Traumatic hip joint tamponade. Two cases with femoral head ischaemia.

Two elderly patients had pain after hip trauma with no radiographic evidence of fracture. Computed tomography demonstrated capsular haematoma. Scintimetry revealed femoral head ischaemia. Intracapsular hip joint pressure in extension was 240 and 176 mm Hg, respectively, in neutral position and 280 and 360 mm Hg in internal rotation. The hip joints were aspirated for 8 ml and 5 ml of blood, respectively, leading to pain relief and regained radiotracer uptake in the femoral head. It is concluded that traumatic hip joint tamponade may cause femoral head ischaemia which may be reversed by aspiration.

Accidents, Home↗
PubMed1985

Definition of endoprosthetic loosening. Comparison of arthrography, scintigraphy and roentgen stereophotogrammetry in prosthetic hips.

Contrast arthrography, radionuclide arthrography, scintigraphy and roentgen stereophotogrammetric analysis (RSA) were used to detect mechanical loosening in 14 painful total hip replacements. All prosthetic components unstable by RSA, or with abnormal arthrogram, or with increased scintigraphic activity, or loose at revision were migrating, but no non-migrating components demonstrated any of these signs of loosening. Our findings indicate that mechanical loosening should be defined as migration.

Contrast Media↗
PubMed1980

Antibiotic containing bone cement beads in the treatment of deep muscle and skeletal infections.

Forty-eight cases of osteomyelitis or bacterial arthritis operated on with eradication of infections lesions were randomly treated either by insertion of suction-irrigation drainage or by implantation of gentamicin beads. The average follow-up time was 2 years. There was no difference in the recurrence rate between the two groups. The gentamicin treated patients were however more easily cared for as the suction-irrigation drainage required constant attention. Local temporary treatment with gentamicin beads should be used in cases of deep gram-negative muscle and skeletal infections where it would otherwise be necessary to give toxic antibiotics.

Adolescent↗
PubMedDate not supplied

Position, orientation and component interaction in dislocation of the total hip prosthesis.

The position, orientation in space and interaction of prosthetic components was determined in 15 patients with known episodes of dislocation after total hip replacement. The same calculations were performed in a reference group of 44 patients without dislocation. In the group with dislocations, there was a significantly decreased femoral anteversion, and a decreased femoral flexion permitted by the prosthetic components. There were no further significant differences of clinical relevance between the groups concerning all other examined parameters of component position, orientation and interaction. It is concluded that the decreased range of flexion, caused by impingement of the prosthetic components with ensuing leverage effect is one cause of dislocation.

Aged↗