Biomedical subjects

B Strömqvist

Publications and source records attributed to B Strömqvist.

94 records · Page 6Linked to original sources

PubMed1980

Dynamics of Technetium-99m methylenediphosphonate imaging of the femoral head after hip fracture.

A prospective study of the development of necrosis of the femoral head was performed in 34 patients with fractures of the femoral neck. Technetium-99m MDP images of the hip regions were obtained immediately after nailing of the hip and at four, eight and 12 months. There was a good correlation between qualitative and numeric evaluation of isotope uptake in the femoral heads. Comparison of the activity level in the femoral head on the fracture side with that in the contralateral control site showed activity ratios to vary between < 1.0 for those heads showing a general reduction in activity on conventional images to > 1.4 with a mean of 2.0 for those showing increased activity. The initial postoperative images in 2/7 undislocated fractures showed a marked depression in femoral head activity on the fracture side; 13/21 dislocated fractures showed a similar defect suggesting a significant loss of bone remodeling. Normal Tc-99m activity in the femoral head (category 2) was observed in two fracture cases imaged within 24 hours of fracture, just prior to nailing. Repeat studies within one week of fracture and nailing demonstrated a marked depression in activity (category 0). Radiographic evidence of collapse later developed in both patients. The perfusion and blood pool images were useful for identifying femoral heads with deficient circulation. This investigation has demonstrated that the nailing procedure may threaten the vascular condition of the femoral head in hip fracture, that a dead head may be radiographically normal and clinically asymptomatic, and that the metabolic condition of the femoral head may be expressed in numeric terms suitable for statistical analysis.

Adult↗

PubMedDate not supplied

Immobilization related to early linear growth.

This study shows that children with late-diagnosed congenital dislocation of the hip (CDH) have close to normal height development during the initial 6.0 years of life. The treatment consisted of immobilization for 0.5 to 1.3 years starting between 0.2 and 0.7 years of age. The present work addresses one specific issue that is related to the age at onset of the childhood component of the ICP growth model. The onset normally appears between 0.5 and 1.0 year of age, and is recognized as an increase in length/height velocity. The onset is thus found during a period of increasing motor activity. The normal successive change from sitting to walking position may have some influence on the onset of this tempo change in early linear growth. The present documentation implies that there is no such influence. In all 14 children with CDH, the onset manifested during the period of immobilization, and the average age at onset was found to be virtually equivalent with that of the controls. Our conclusion is that immobilization has no significant influence on the age at onset of the childhood phase of growth. The onset is accomplished independent of body position, be it lying down or normal for the age.

Age Factors↗

PubMedDate not supplied

CDH diagnosed at 2 to 12 months of age--treatment and results.

A treatment program for late-diagnosed CDH included skin traction, arthrography, tenotomy of adductor and psoas tendons, and immobilization of the hips in the "frog leg" position with a plaster cast for 8-12 weeks, followed by an abduction frame until the acetabular dysplasia normalized. Follow-up of 40 children with nonteratological CDH performed 2-12 years after diagnosis revealed 38 normal hips and 2 patients with coxa magna, one of whom had intermittent hip pain.

Casts, Surgical↗

PubMedDate not supplied

Technetium-99m-methylenediphosphonate scintimetry after femoral neck fracture. A three-year follow-up study.

Thirty-nine patients with femoral neck fractures were followed up clinically and radiographically by technetium-99m-methylenediphosphonate (99mTc-MDP) scintimetry two to 20 days and four, eight, 12, 24, and 36 months after surgery or until redisplacement, pseudarthrosis, or segmental collapse occurred. The scintimetric data were calculated by selecting regions of interest on the fractured and intact sides over the femoral head, neck, greater trochanter, and shaft; ratios of fractured/intact side were obtained for each region. Bone metabolism after femoral neck fracture was expressed and analyzed numerically. Prognosis regarding the course of healing could be made with precision by studying femoral head isotope activity shortly after surgery, preferably one to three weeks after operation. Intact femoral head uptake (ratio greater than 1.0) was connected with uneventful healing, while defective uptake (ratio less than 1.0) was observed with healing complications. The vast majority of femoral heads with primary uptake defects showed increased uptake (greater than 1.0) after four months, often as early as six to eight weeks, indicating revascularization. Segmental collapse, as well as redisplacement and pseudarthrosis, appear to be related to femoral head vascular injury. Femoral head uptake in patients in whom healing complications developed secondary to avascularity differed significantly from that in patients with normal healing, except at investigations performed four to eight months after operation. 99mTc-MDP uptake in the femoral neck, trochanter, and shaft areas was increased for all femoral neck fractures. Subsequent normalization was considerably slower in patients with healing complications. A significant difference from normal healing did not occur until 12-24 months after operation. For patients with contralateral hip disease affecting the femoral head ratio, the prognosis regarding complications was made with the aid of the femoral head/shaft ratio on the fracture side.

Adolescent↗