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Featured researches published by Svein Anda.


Acta Orthopaedica Scandinavica | 1994

Intercondylar notch width and the risk for anterior cruciate ligament rupture. A case-control study in 46 female handball players.

Hakon Lund-Hanssen; James Gannon; Lars Engebretsen; K. J. Holen; Svein Anda; Lars J. Vatten

We measured the intercondylar notch of the femur in female handball players from radiographs of 20 players with previous unilateral anterior cruciate ligament injury, and 26 controls without injury. The groups were comparable regarding age, height, weight and level of performance. Intercondylar fossa radiographs were obtained in a posteroanterior axial position. The anterior opening of the intercondylar notch was narrower in the healthy knee of the injured group compared to the controls. There was an increased risk of anterior cruciate ligament injury associated with decreasing notch opening: female handball players with 17 mm or less anterior notch width were 6 times more susceptible to anterior cruciate ligament injury compared to players with wider notch width.


Acta Orthopaedica Scandinavica | 1989

Regression of femoral anteversion. A prospective study of intoeing children.

Svein Svenningsen; Kristen Apalset; Terje Terjesen; Svein Anda

To study the spontaneous regression of femoral anteversion, 30 children referred to the outpatient clinic for intoeing were followed until at least 15 years of age. The mean observation time was 9 (7-12) years, and all the children were examined three times during the growth period. The mean radiographic angle at the first examination was 42 degrees, at the second examination 36 degrees, and at the last examination 28 degrees. The mean decrease of the AV angle per year was 1.5 degrees, with a considerable range (0.2-3.1 degrees). The mean internal rotation of the hip decreased from 74 degrees to 53 degrees during the observation period, and the external rotation increased from 19 degrees to 37 degrees. While all 30 children had an intoeing gait at the first examination, this disappeared in all but 5 children.


Clinical Orthopaedics and Related Research | 1990

Femoral anteversion in adolescents and adults measured by ultrasound.

Terje Terjesen; Svein Anda; Svein Svenningsen

Femoral anteversion (AV) was determined by ultrasound in 40 adolescent and adult patients with rotational disorders of the femur, and the results were compared with AV measurements by biplanar roentgenography. With the patients supine, their knees flexed 90 degrees, and their lower legs strapped in the vertical position, one scan only of the proximal femur was needed to measure the anteversion by ultrasound. The transducer was tilted until the desired measuring line appeared horizontal on the monitor screen. The angle of tilt of the transducer, which represented the AV angle, was measured with an attached clinometer. The correlation between ultrasound and roentgenographic AV angles was high, indicating that reliable results were obtained by ultrasound. The preferred reference line was the head-trochanter tangent, which is recommended for clinical use. Consistently greater AV values were measured by ultrasound than by roentgenography. Thus, 10 degrees should be subtracted from the ultrasound values in order to obtain the real AV angles. One of the benefits of ultrasound is the elimination of radiation hazards to the patients. Ultrasound is recommended as a screening technique for patients with rotational disorders of the femur.


Acta Orthopaedica Scandinavica | 1989

Osteotomy for femoral anteversion: complications in 95 children

Svein Svenningsen; Kristen Apalset; Terje Terjesen; Svein Anda

Totally, 95 children with increased femoral anteversion had derotational substrochanteric osteotomy with plate fixation. The mean anteversion angle was reduced from 48 degrees to 4 degrees, internal hip rotation from 81 degrees to 42 degrees, and external rotation increased from 9 degrees to 48 degrees. All the osteotomies healed, but serious complications occurred in 13 of the 95 patients. Because of the risk for complications and the trend towards spontaneous regression of femoral anteversion with age, we recommend a much more conservative attitude with regard to operative treatment.


Acta Orthopaedica Scandinavica | 1987

Femoral anteversion in children measured by ultrasound

Terje Terjesen; Svein Anda

The femoral anteversion was measured by ultrasound and biplanar radiography in 57 children, most of whom had clinical signs of increased anteversion. A modification of previously reported ultrasound techniques was introduced, as the transducer was tilted instead of being kept horizontally. Four different modes of ultrasound examination were evaluated. The most appropriate technique involved only one ultrasound scan at the hip level. The correlation between the results of ultrasound and radiography was good with less than 10 degrees discrepancy in the majority. Ultrasound is suitable for screening children with rotational disorders of the femur. The main advantage of the method is that exposure to radiation is avoided.


Acta Orthopaedica Scandinavica | 1990

Osteotomy for femoral anteversion: A prospective 9-year study of 52 children

Svein Svenningsen; Terje Terjesen; Kristen Apalset; Svein Anda

Fifty-two children with increased femoral anteversion had bilateral derotational subtrochanteric osteotomies at a mean age of 7 years. They were followed prospectively until at least 15 years of age; the mean observation time was 9 years. They were a subset of 95 children whose 2-year results were reported in 1989. The mean increase of femoral anteversion after the osteotomy was 6 degrees (0.7 degrees per year) and of the neck-shaft angle 5 degrees. The CE angle did not increase. Although we at present practice a more restrictive attitude towards operation of increased femoral anteversion, our study showed that a derotational osteotomy is effective in eliminating the intoeing gait and associated complaints, and the hip angles change only moderately during the remaining period of growth.


Acta Orthopaedica | 2008

Polyethylene acetabular wear in hip prostheses: Computer-simulated quantification of error caused by changes in pelvic orientation and direction of wear

Olav A. Foss; Jomar Klaksvik; Pål Benum; Svein Anda

Background and purpose Polyethylene is commonly employed for bearings in acetabular cups used in hip replacements. Assessment of in vivo wear is important for evaluation and monitoring of wear in individual patients, as well as in different implant designs. Polyethylene wear is quantified by comparisons of radiographic measurements made on sequential pelvic radiographs. Variations in pelvic orientation and variation in direction of wear may cause underestimation of polyethylene wear measurements. The purpose of this study was to quantify these effects on 2-dimensional measurements of polyethylene wear. Methods A computer program designed to simulate radiographs was employed to generate virtual radiographs of a virtual pelvis with a total hip replacement. Effects caused by variation in pelvic spatial orientation and variations in wear direction on wear measurements were analyzed separately. A Monte Carlo computational algorithm was employed to describe the combined effects of these two factors. Results Variation in pelvic orientation induced a mean underestimation of wear of 0.4% (0–2.6). Variation in direction of wear introduced a mean underestimation of 8.5% (0–42). A mean underestimation of wear of 9% (0–99) was found when varying both pelvic orientation and direction of wear simultaneously. Interpretation Errors caused by variations in pelvic orientation and wear direction are likely to be small compared to other sources of error when performing polyethylene wear measurements in acetabular components.


Acta Orthopaedica Scandinavica | 1986

Voluntary hip subluxation examined by computed tomography

Svein Anda; Svein Svenningsen; John Slørdahl; Pål Benum

In a 17-year-old girl, voluntary posterior subluxation of the hip was demonstrated by fluoroscopy, cineradiography, and computed tomography.


Acta Orthopaedica Scandinavica | 1982

Increased Femoral Anteversion and Osteoarthritis of the Hip Joint

Terje Terjesen; Pål Benum; Svein Anda; Svein Svenningsen


Acta Orthopaedica Scandinavica | 1995

Extraarticular transposition of the patellar tendon for anterolateral instability of the knee. Poor results in 52 patients after 5-14-year follow-up.

Torbjørn Grøntvedt; Lars Engebretsen; Pål Benum; Svein Anda

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Terje Terjesen

Oslo University Hospital

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Pål Benum

Norwegian University of Science and Technology

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Olav A. Foss

Norwegian University of Science and Technology

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Lars J. Vatten

Norwegian University of Science and Technology

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Torbjørn Grøntvedt

Norwegian University of Science and Technology

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