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Results for “External Fixators”

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At least 1,711 records · Page 95Linked to original sources
PubMed1989

[Various aspects of developing polyfunctional pins for external fixation equipment and devices].

The authors have carried out their investigations on standard experimental equipment with the aim of obtaining comparative characteristics and choosing an optimal construction of the cutting part of the polyfunctional rods. Permissible values of the axial force and the torque for the rods inserted by a hand tool have been determined, which correspondingly are 10 kg force and 10 kg force/cm.

Bone Nails↗
PubMed1989

[Results of treatment of 202 fresh tibial shaft fractures, managed with unilateral external fixation (monofixateur)].

From 1982 to 1986, a total of 202 lower leg fractures (70 closed, 132 open fractures) were treated with a monoexternal fixation device, and 148 cases were included in the follow-up study. The mean healing time was 15.4 weeks for closed fractures and 18.4 weeks for open fractures. Infection was occurred in 3.4% of the patients followed up (5.1% open fractures, as 0% closed fractures), aseptic delayed in 8.8%, and pin tract infection in 2.5%. The group of patients with open fractures treated with additional lag screws (n = 74) showed a higher rate of refractures (10.9% vs 4.5%) and bone grafting (65.5% vs 29.5%) than the control group without lag screws (n = 58). The healing times (15.8% vs 15.5 weeks) and rates of non-union (10.9% vs 11.4%) were similar in both groups. Among 14 cases of secondary intramedullary nailing, osteitis occurred in 2. In the dynamized group (n = 53) healing time was reduced to 16.0 weeks, as against 18.0 weeks in the n-dynamized group (n = 95).

Adolescent↗
PubMed1989

[Possibilities of treatment of fractures using external fixation in children].

The authors submit their own experience with the use of a MCD device (modified compression-distraction apparatus) in the treatment of open fractures in children. The MCD apparatus is of their own design and manufacture and the results obtained in the treatment of fractures with this apparatus are satisfactory.

Child↗
PubMed1988

[Results of biomechanical studies of various external fixation devices of the pelvis].

Various mounting systems used in fixation of the pelvis were tested for their stability. The systems were mounted on macerated pelvices and their firmness examined. The criterion for the examination was on the one hand the force needed under distraction to cause a distension in the region of the symphysis or of the sacroiliac joint of 1 cm., on the other hand the force needed to tilt the disjunction points for 1 cm. when shearing takes place. It was concluded from the study that in clinical use, given unstable pelvic fractures, mountings applied only anteriorly are not capable of withstanding the strain expected under biological conditions. Consequently, mobilisation with full weight bearing in instable pelvic fractures is not possible in a shorter period of time than with conservative (extension) treatment.

Biomechanical Phenomena↗
PubMed1989

Unilateral external fixation. Methods to increase and reduce frame stiffness.

Unilateral configurations with stiffness characteristics similar to those of the most rigid one- and two-plane bilateral constructs are easily built. Mechanically, most effective were two-plane unilateral frames with a short bone-rod distance. But single- and double-bar anterior unilateral frames had the best combination of clinical and mechanical features. To put gradual frame builddown on a rational basis, a sequence of stepwise frame reduction was developed. This sequence leads from the most rigid unilateral constructs to frames that allow almost complete force transmission across the fracture site while still providing adequate protection against the prevailing sagittal bending moments.

Elasticity↗