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At least 1,549 records · Page 86Linked to original sources
PubMed1986

Internal fixation of a capitellar fracture using Herbert screws. A case report.

Fractures of the capitellum can involve a significant portion of the articular surface, rendering the elbow joint unstable. In this situation it is desirable to reduce and internally fix the capitellar fragment, because this restores the articular surface and augments joint stability. A 35-year-old woman sustained a posterolateral dislocation of the left elbow associated with a capitellar fracture. Fixation of the capitellar fragment with Herbert screws stabilized the joint, allowed anatomic reduction, and gave good fixation. Active motion was possible at three weeks. When the patient was evaluated at one year, the fracture had united and there was no evidence of avascular necrosis.

Adult↗
PubMed1987

[Scapulohumeral arthrodesis by combined external and internal fixation. A biomechanical, technical and clinical study].

The indications for arthrodesis of the shoulder are controversial and limited and fusion is difficult to achieve, as is shown by the number of methods described in the literature. Since 1970, the authors have used combined internal and external fixation for arthrodesis of the shoulder. From a biomechanical study of arthrodesed shoulders, an attempt has been made to define the best combination of fixation. Three progressively more complex methods combining intra-articular fixation with a Hoffmann external fixator in compression have been tested. The ideal method combines transverse double scapulo-humeral screws with a vertical acromio-humeral screw. The addition of a bony subacromial strut controls the shearing effects arising from the application of the fixator in compression and also provides an upper site of fusion. In 14 arthrodeses using combined internal and external fixation analysed with a two to sixteen year follow-up, acromio-humeral fixation has been used in 11 cases with 10 primary successes and in 3 cases triple screw fixation has given very rapid fusion without the need for spica immobilisation.

Arthrodesis↗
PubMed1993

[Surgical treatment of cranial dysostosis with internal fixation method].

We present our experience using plates and screws for the fixation of craniofacial mobilizations. We describe the osteotomies "monoblock advancement" combined or not with "facial bipartition", used for the treatment of Crouzon's disease and Apert's syndrome respectively. We expose our experience gained on 42 patients with a follow up of six years, pointing out the indications for plates and screws. The advantages of this method are discussed, being mainly these: stable fixation, early surgery and no intermaxillary fixation needed.

Child↗
PubMed1990

Internal fixation compression arthrodesis of the ankle.

Sixteen patients were treated by internal compression arthrodesis of the ankle using cancellous screw fixation. Thirteen patients had a preoperative diagnosis of traumatic osteoarthritis, and three patients had rheumatoid arthritis. All patients were followed until clinical and roentgenographic evidence of union had been obtained (average, 15.1 months). Union was obtained in 15 of 16 cases (94%) by an average of 9.2 weeks. The average ankle evaluation score was 77 points, with 80% of the patients rated good or excellent. Suboptimal results were attributed to technical errors. Midtarsal motion averaged 18 degrees, and subtalar motion was present in the majority of patients after surgery. This technique provides a high union rate while permitting early mobilization of the adjacent hindfoot and midfoot joints with earlier return to satisfactory function.

Adult↗
PubMed1992

A new design of internal fixation for scoliosis and its preliminary clinical application.

A new scoliotone composed of screw, socket, distraction rod, lateral mass and compression rod can produce free movement in three different planes and fix the vertebral column in three-dimensions. The instrument has a strong force of fixation, distraction, compression and anti-rotation and it can be locked in any degree angle. Preliminary clinical application in 10 cases showed that when the spinal curvature (Cobb's angle) was less than 50, the average correction rate of scoliosis was 78.2% and that of the hump was 90%; when Cobb's angle was within 50-100 degrees, the average curve correction was 68.2%, and the hump correction 87.7%; when Cobb's angle was 100 degrees, the average curve correction was 63.3%, and the hump correction 82%. The vertebral column needed no external fixation after the operation. Biomechanical characteristics of the vertebral pedicle, and the technical features are discussed.

Humans↗
PubMed1992

Internal fixation of radial neck fracture in a fracture dislocation of the elbow. A case report.

A 27-year-old manual laborer presented with dislocation of the right elbow, complete separation of the radial head at the neck level, and avulsion of the coronoid process. Closed reduction of the elbow resulted in ulnohumeral instability. As an alternative to silastic implant, the radial head was reduced, internally fixed, and used as a spacer to restore elbow stability. The radial head fracture healed with no sequelae. At two years follow-up examination, the patient had a stable elbow with nearly full range of motion.

Adult↗
PubMed2000

Biodegradation behavior of ultra-high-strength hydroxyapatite/poly (L-lactide) composite rods for internal fixation of bone fractures.

The purpose of this study was to investigate the biodegradation behavior of the ultra-high-strength hydroxyapatite/poly(L-lactide) (HA/PLLA) composite rods for fracture repair. Two kinds of composite materials were used in this study: u-HA/PLLA. which contained 30% by weight of uncalcined HA as reinforcing particles, and c-HA/PLLA, which contained 30% by weight of calcined HA as reinforcing particles. These composite rods were implanted in the subcutis and in the medullary cavities of rabbits. The specimens were removed at specific intervals between 2 and 52 weeks and the mechanical strength was measured for the rods in the subcutis, and the molecular weight and crystallinity were measured for the rods in both the subcutis and medullary cavities. The rod surfaces were examined using a scanning electron microscope (SEM). The specimens were examined histologically by light microscopy. The bending strength of the composites implanted in the subcutis was maintained at more than 200 M Pa at 25 weeks and at 150 MPa at 52 weeks. The molecular weight dropped to 45% of the initial values at 8 weeks and to approximately 10% at 52 weeks. Significant differences in the molecular weight were seen between c-HA/PLLA and u-HA/PLLA, with u-HA/PLLA showing a faster rate of decrease than c-HA/PLLA after 8 weeks. SEM demonstrated that HA particles disappeared increasingly from the rod surfaces over time and that the spaces left by these HA particles formed many pores in the composite surfaces at 52 weeks. Histologically, a fibrous tissue layer was formed around the composite rod from 4 weeks in the subcutis and in the diaphyseal area of the medullary canal. This became more mature over time. Bony tissue contact to the composites without fibrous tissue layers was seen in the metaphyseal area of the medullary canal. During the experimental period, there were no inflammatory cells such as mono- or multi-nuclear phagocytes. Although further long-term studies for degradation are needed, the composites have promising mechanical strength and no adverse tissue reaction for use as fracture-fixation devices during the experimental periods.

Animals↗
PubMed1995

[Progress in internal fixator stabilization of thoracolumbar spinal fractures].

At present, several different fixators are in clinical use in the full range of thoracic and lumbar spine disorders. Nevertheless, an effort must be made to continue to improve pedicle fixation devices so that more safety, strength, adaptability and user-friendliness can be obtained. Fixation systems are subject to high loads, especially in major spinal injuries with marked loss of stability. Implant failure, producing poor clinical results, is a series problem. For safer and easier instrumentation a new fixator called the modular spine fixator (MSF) has been designed. The MSF consists of only a few basic components. Its main advantages are the smooth construction and small size, the modularity and easy handling, the high mechanical stability and optimal fatigue properties. In contrast to other fixators, the pedicle screws of the MSF act as compression screws. In high-load static and fatigue testing the MSF revealed no component loosening, material yielding or breaking. More than other systems, the MSF is suitable for short one-level instrumentation, thus avoiding overbridging uninjured motion segments. Between 1991 and 1993 60 instrumentations in the treatment of unstable thoracic and lumbar injuries were performed with the MSF. Single-level instrumentations were done in 34, two-level instrumentations in 24, three- and four-level instrumentations in 2 cases, all combined with posterior allogenic bone grafting. Since the beginning of 1993 transpedicular anterior bone grafting has been performed in addition, using autogenic bone material. In this series no implant fatigue failure has been noted. There were three infections requiring removal of the posterior bone graft in two and graft in fixator removal in one.(ABSTRACT TRUNCATED AT 250 WORDS)

Adult↗
PubMed1992

Exstrophy of the bladder: primary closure after iliac osteotomies without external or internal fixation.

A total of 6 consecutive infants with exstrophy of the bladder underwent iliac osteotomy in association with primary closure of the bladder without internal or external fixation of the bony pelvis. Hospitalization time was short and there were no resulting problems with healing, bony deformities or subsequent ambulation. Fixation of the bony pelvis after iliac osteotomy does not appear to be necessary in nonambulatory patients undergoing primary closure for bladder exstrophy.

Bladder Exstrophy↗