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At least 1,081 records · Page 60Linked to original sources
PubMed1996

[The Ilizarov external fixator and method. Treatment of congenital and acquired deformities].

The Ilizarov method, with external fixation by means of rings, rods and wires, has been used at the Norwegian National Hospital, Orthopaedic Centre, since 1992. The method is unique in correcting multiplanar deformities in one surgical procedure. We have treated 70 patients with a wide variety of orthopaedic etiologies. Soft tissue and bone deformities in the lower extremity have been corrected separately or combined. The frequency of complications has been relatively high, but we still think that the Ilizarov method is useful to correct complex deformities in children and adults alike.

Adolescent↗
PubMed1992

Fracture healing monitored with strain gauges. External fixation of 7 humeral neck fractures.

We measured healing in 7 cases of surgical neck fracture of the humerus by applying a strain gauge measuring bar between the external fixation pins. Repeated measurements provided a healing curve for the individual cases. The gradual decrease in deflection of the fracture zone reached a plateau of about 50 percent after 2 to 4 weeks in 6 cases. Removal of the frame at this time proved safe, as solid healing occurred. In one fracture no such decrease was seen and nonunion developed.

Aged↗
PubMed2003

External fixation for surgical treatment of a mallet finger.

A new surgical technique is described for the treatment of mallet finger deformity which involves the application of a mini external fixator across the distal interphalangeal joint and resection of a portion of the extensor mechanism. We reviewed 19 patients who were treated with this technique, at a mean follow-up period of 36 (range, 24-48) months. The mean extensor lag was 2 degrees (range, -7 degrees to 13 degrees ) and the mean flexion range was 70 degrees (range, 20 degrees -90 degrees ).

Adolescent↗
PubMed2004

Role of dynamic external fixator in the management of fractures of distal end of radius.

The intra-articular fracture of radius has been an enigma for orthopaedic surgeons since time immemorial. It is a dilemma as to when to use the fixator, when to mobilise after fixator or simply treat it by conservative means. Numerous fixators are in vogue depending on the preference of the surgeon--in the present prospective study the results of dynamic external fixator--which, based on the principle of ligamentotaxis, were evaluated over a 3-year period and the results showed that although excellent radiological results were seen in 90% of the cases yet only 75% of the cases had a excellent functional result.

Adult↗
PubMed1995

The design and performance of an experimental external fixation device with load transducers.

It is becoming increasingly common that fracture healing is modelled in the laboratory with an osteotomy in the diaphysis of the ovine tibia. External fixation is often used to hold the bones in these models, presenting the problem that the loads on such devices are poorly understood. To help investigate this, a unilateral device has been developed which is capable of measuring the two components of load considered to be the most important, that of axial compression and bending in the plane of the fixator. The device was found to be a rigid system and easy to apply, with the in-vivo measurements being straightforward. The estimated limits of error of the compression transducer are +37.9 N and -21.4 N and those of the bending transducer are +3.6 Nm and -4.2 Nm. Preliminary measurements showed the maximum load during normal walking to 345 N compression and 28 Nm in-plane bending.

Animals↗
PubMed1983

External fixation of pelvic fracture ex vivo.

Cranial dislocations of the fractured hemipelvis is the most difficult component to reduce and control by external fixation. The stabilizing effect of several external frames was studied using a cadaver pelvis. Single frames, double frames, trapezoid frames and double trapezoid frames were mounted in three pin units on each anterior iliac crest. Successively increasing the number of transverse connecting rods increased the stability of the construction. Wiring of the symphysis had the same effect, when constructions with one or two transverse rods were used. Double fixation sites of the pin units in the anterior pelvis added only marginally to the stability. The highest rigidity was achieved using a circumferential frame with pin units in both anterior and posterior iliac crests.

Bone Nails↗
PubMed1993

Mechanical performance of external fixators with wires for the treatment of bone fractures--Part I: Load-displacement behavior.

Using matrix algebra, a mathematical model is formulated for a particular type of external fixator with wires (system developed by Ilizarov) for the treatment of bone fractures. The mathematical model is used to give a linear estimate of the stiffness under lateral and axial loads in a representative number of practical conditions. Relative displacements of the bone ends at the fracture site are calculated not only in the common case of a gap, but also for various angles of inclined sliding contact; in this case, a realistic load is applied and nonlinear stiffening of the wires under transversal loads is iteratively taken into account.

Biomechanical Phenomena↗
PubMedDate not supplied

Effect of a supplemental plate on the stiffness of a type I external fixator.

OBJECTIVE: To assess the effect of a supplemental plate on the stiffness of a six-pin unilateral external skeletal fixator. STUDY DESIGN: Mechanical testing performed on models. METHODS: Wooden (birch) dowels were used to create five models of a fracture. A commercially available external fixation system was applied to the model with a uniform unilateral six-pin fixator design. The models were mechanically tested with and without a supplemental plate attached to the 2 clamps adjacent to the fracture gap. Testing was conducted in axial loading, medial to lateral bending, and cranial to caudal bending. RESULTS: Results showed a 4.42-fold increase in stiffness in axial load, a 4.23-fold increase in stiffness in medial to lateral bending, and a 1.94-fold increase in stiffness in cranial to caudal bending with the addition of the plate. CONCLUSIONS: The addition of a supplemental plate increases the mechanical stiffness of unilateral fixators. This was especially true in axial load and medial to lateral bending. CLINICAL RELEVANCE: A supplemental plate can be used with unilateral fixators to increase stiffness of the fixator. Conversely, the plate can be removed to decrease stiffness without the removal of fixation pins.

Animals↗
PubMed1994

Routine application of the pinless external fixator.

One serious disadvantage of conventional fixator systems is the need to open the medullary space, hence creating a direct communication with the exterior. The new pinless external fixator does not have this major disadvantage, because the fixator clamps simply rest on the cortical bone without penetrating it. Clinically, this easily managed system is intended for fractures of the tibia in cases in which primary internal fixation is precluded either by precarious local or general conditions or by infrastructural problems. In such situations the new pinless fixator is an excellent device with which to achieve good stabilization of the fracture rapidly, while leaving open all options for subsequent alteration of treatment. If the surgeon decides to convert to locked intramedullary nailing, the pinless fixator facilitates the new approach, because it can be used as a distractor and makes it unnecessary to transfer the patient to a fracture table.

Adult↗
PubMed1996

Two case reports of a technique of medial external fixation in calcaneal fractures: indirect control of the sustentacular fragment.

In attempted open reduction and internal fixation of displaced calcaneal fractures, comminution of the sustentacular fragment can pose major problems. Two cases of a form of external fixation are presented. The method takes advantage of the strong superomedial and plantar calcaneonavicular ligaments, which link the sustentaculum to the navicular. Traction along these structures (by pins placed in the first metatarsal) indirectly controls the sustentacular fragment, while countertraction from medially placed pins in the tuberosity allows derotation of the fragment and correct repositioning in relation to the sustentaculum. The essential deformities of a calcaneal fracture are corrected by this technique. In addition, distortion of the middle facet appears to correct as well.

Adult↗
PubMed1997

Stabilisation of a mandibular fracture in a cow by means of a pinless external fixator.

A four months pregnant, four-year-old Brown Swiss cow with mandibular fractures of the right horizontal ramus and the symphysis was treated surgically with a new pinless external fixator. Healing was complicated by the sequestration of bone at the fracture site. After the sequestrum had been removed a radiographic examination revealed that the fracture had healed completely.

Animals↗
PubMedDate not supplied

[External fixators in temporary spinal stabilization. Radiographic anatomy of the lumbar pedicles].

External spinal fixation is used in cases where fusion is indicated and for reducing the number of stiffened segments in lumbar sacral pain. Owing to the percutaneous implantation, only the pedicle oval is available for localizing the screw in a-p X-rays. Cadaver studies have shown that the root of the arch and the halo are not identical and that unless one relies on the midpoint of the halo the pedicle may be perforated medially. rate, with markedly enhanced fusion of the lumbar spine following external spinal fixation.

External Fixators↗
PubMed1990

External fixation for type III open tibial fractures.

An analysis of 51 type III open tibial fractures treated by external skeletal fixation is presented. The fractures are subdivided according to the classification of Gustilo, Mendoza and Williams (1984) into types IIIa, IIIb and IIIc. The different prognoses of these fracture subtypes is examined. The use of the Hoffmann and Hughes external fixators in the management of type III open tibial fractures is presented and it is suggested that the prognosis is independent of the type of fixator used.

Adolescent↗
PubMed1993

The external fixation test of the lumbar spine. 30 complications in 25 of 100 consecutive patients.

We retrospectively analyzed the rate and character of complications in a series of 100 consecutive external fixation tests during 1985-1991. There were 30 complications in 25 patients. The most common was pin tract infection, which was definite in 12 cases and probable in 6. Although 12 patients developed complications that resulted in removal or reapplication of the device. 8 cases had an incorrect position of a Schanz screw; 3 of these had neurological complications. The only variable having a significant association with complications was the duration of the test. Because of this complication rate, the indications for the test should be carefully considered.

Adult↗
PubMedDate not supplied

Using the Ilizarov external fixator in bone transport.

Bone transport is moving into the avenues of orthopaedic medicine by creating new alternatives to former methods of treatment. It is a challenging limb salvage procedure that uses the Ilizarov External Fixator. Cooperation and commitment from the patient and orthopaedic team can create exciting results.

Bone Transplantation↗
PubMed1997

External fixation and secondary intramedullary nailing of open tibial fractures. A randomised, prospective trial.

We performed a prospective, randomised trial in 39 patients with open tibial fractures treated initially by external fixation to compare cast immobilisation (group A) and intramedullary nailing (group B) as a sequential protocol planned from the onset of treatment. The results showed that group B achieved faster union (p < 0.05) than group A with less malunion or shortening and a greater range of movement. Patients treated by intramedullary nailing required fewer radiographs and outpatient visits (p = 0.0015) and had a more predictable and rapid return to full function. We feel that these severe fractures are better treated by delayed intramedullary nailing and that this has an acceptable rate of complications.

Adult↗