Biomedical subjects

T Terjesen

Publications and source records attributed to T Terjesen.

77 records · Page 5Linked to original sources

PubMedDate not supplied

Acetabular angles and femoral anteversion in dysplastic hips in adults: CT investigation.

Transpelvic CT was used to quantify the relationship between the acetabulum and proximal femur in 21 adult patients (33 hips) with congenital hip dysplasia (defined by a center edge angle of less than 20 degrees). The anterior and posterior acetabular sector angles (AASA and PASA) were measured, as well as the degree of acetabular and femoral anteversion. The results demonstrated deficient anterior acetabular support (i.e., decreased AASA) in approximately two-thirds of the dysplastic hips and reduced posterior support (i.e., decreased PASA) in one-third. The acetabular anteversion was normal. The femoral anteversion. however, was greater than normal in most hip. As important additional information is obtained by CT compared with conventional radiography, CT is recommended when operative procedures aimed at preventing or postponing osteoarthrosis are considered.

Acetabulum↗

PubMedDate not supplied

Ultrasonography in the primary evaluation of patients with Perthes disease.

The utility of ultrasound in the primary examination of patients with Perthes disease was evaluated. Nineteen patients were examined with a longitudinal lateral and an anterior scan. Ultrasound was reliable in diagnosing Perthes disease when the surface of the ossified epiphysis was irregular and when fragmentation had occurred. There was good correspondence between ultrasound and radiography in assessment of femoral head coverage. Twelve patients had an increased anterior joint space, indicating accompanying synovitis. Femoral anteversion (AV) angles, measured by ultrasound, were significantly greater in the affected hips, but mean side difference (3 degrees) was moderate. Ultrasound provided useful information. Like conventional radiography, ultrasound showed the irregular structure of the bony epiphysis and the lateral coverage of the femoral head. In addition, the anterior coverage, an accompanying synovitis, and the degree of femoral AV were obtained. In the very early stage, the femoral head may look normal by ultrasound, but a persisting joint effusion arouses the suspicion of Perthes disease.

Child↗

PubMedDate not supplied

Ultrasound screening for hip dysplasia in newborns.

We evaluated risk factors for neonatal hip instability (NHI) at birth using ultrasonography and assessed the reliability of our ultrasound method by means of an interobserver study. The hips of 4,459 newborns were examined by ultrasound from 1988 to 1990. The ultrasound evaluation was based mainly on measurement of femoral head coverage (FHC) by the bony acetabular roof. The mean FHC was 56% in boys and 54% in girls (a significant difference). Fifty-five newborns with unstable hips had a mean FHC of 37%, which was significantly lower than that of the normal hips. Known risk factors for NHI were confirmed (breech position, family history of hip dysplasia, increased birth weight), but no new risk factors were detected. The interobserver study included 200 hips. The 95% confidence limit for interobserver variation in FHC (+/- 2 SD) was +/- 8%. Because of this moderate interobserver variation, and because the incidence of late-detected hip dysplasia was low (0.2 per 1,000), we conclude that our method for ultrasound examination is sufficiently reliable for screening of hips in newborns.

Female↗

PubMedDate not supplied

Ultrasound in the diagnosis and follow-up of transient synovitis of the hip.

Of 59 patients (2-15 years of age) with acute synovitis of the hip, one patient developed Perthes disease (1.7%) and the others transient synovitis. The diagnostic criterion for intracapsular effusion was a side difference greater than or equal to 2.0 mm in the distance between the anterior joint capsule and the femoral neck (anterior capsule distance, ACD). At the time of admission, the mean ACD of the affected and unaffected hips was 8.2 and 4.2 mm, respectively. The effusion persisted for greater than 1 week in 58% of the patients. We recommend ultrasound as the main imaging technique in the diagnosis and follow-up of transient synovitis. Radiography may be omitted in uncomplicated cases, but should be employed when Perthes disease is suspected.

Adolescent↗

PubMedDate not supplied

Femoral anteversion measured by ultrasonography and radiography. An anatomic investigation.

Radiographic and real-time ultrasound measurements of femoral anteversion were compared in an anatomic study of 20 dried adult femurs. The real anteversion (AV) angle was determined by biplanar radiography. In four ultrasound measurements, the linear transducer was kept either horizontal or tilted. The measuring lines were either the anterior tangent of the femoral head--greater trochanter or the anterior tangent of the femoral neck. With the tilted transducer, the correlation between the head-trochanter AV angle and the real AV angle was high (r = 0.9452), and slightly less when the anterior neck AV angle was used (r = 0.9142). The clinical relevance is that the tilted transducer technique with the head-trochanter tangent is recommended for AV screening in patients with clinical signs of increased femoral anteversion. In adults 8.5 degrees has to be subtracted in order to obtain an approximation of the real AV angle.

Adult↗