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At least 199 records · Page 11Linked to original sources
PubMed1996

Retention of asymptomatic bone plates used for orthognathic surgery and facial fractures.

Over the past three decades there has been an improvement in biomaterials that has virtually replaced the use of stainless steel with titanium and its alloys. Based on the possibility of causing corrosion, toxicity, hypersensitivity, and stress protection, stainless steel should not be considered as a permanent implant in maxillofacial fixation. However, because of their superior corrosion resistance, noncarcinogenicity, hyposensitivity, nontoxicity, and excellent tissue compatibility, titanium and Ti-6Al-4V may be retained as permanent implants in maxillofacial fixation. The stress protection offered by such devices, and the possible complications associated with their removal, also support this concept. Finally, the costs incurred in removal do not justify the benefits derived.

Alloys↗
PubMedDate not supplied

An in vitro biomechanical study of bone plate and interlocking nail in a canine diaphyseal femoral fracture model.

OBJECTIVE: To compare the structural properties and the interfragmentary motion in ostectomized canine femurs stabilized with either an 8-mm interlocking nail system (IN) or a 10-hole dynamic compression broad plate (DCP). ANIMAL OR SAMPLE POPULATION: Ten pairs of adult canine femurs with a 25-mm mid-diaphyseal gap. METHODS: Bone specimens were divided into 2 groups (10 femurs each). Left femurs were stabilized with a DCP and 8 bicortical screws; right femurs were stabilized with an IN and 3 screws. Mechanical tests were performed in eccentric axial loading and in craniocaudal bending. The testing was first conducted nondestructively and then until breakage. Structural properties, ie, stiffness, yield limits, and failure limits, were determined. Interfragmentary motion was measured during nondestructive tests with the use of an optoelectronic device. Axial, transverse, and rotational motions were calculated. Mean values of stiffness, yield and failure limits, and axial and shear motions for each fixation method were compared using a paired t test within each group (P <.05). RESULTS: Mean (+/-SD) values of stiffness and failure limit were significantly higher for IN constructs than for DCP constructs in compression, while there was little difference in the results between each tested group in bending. Mean yield load values were significantly higher for IN than for DCP specimens in compression as well as in bending. The axial-motion analysis revealed significant differences between IN and DCP groups during bending tests only. The highest score of transverse motion at the gap was recorded during bending tests, and was higher for DCP than for IN specimens. There were insignificant differences between the two groups with regard to rotation around the diaphyseal axis. CONCLUSIONS AND CLINICAL RELEVANCE: Structural properties and interfragmentary shear motion analysis demonstrated a much higher rigidity in the IN-bone than in the DCP-bone constructs.

Animals↗
PubMed1988

Anatomical studies and a correlative management of facial skeleton and skull base injuries with bone plate fixation.

Miniplate osteosynthesis is an osteoplastic procedure that achieves secure stabilization of the midface, even following extensive fractures of the midface and the floor of the anterior cranial fossa. This procedure can be considered a satisfactory operative treatment in terms of cosmetic and functional results. Correlative osteology is discussed and clinical experiences are reviewed.

Adult↗
PubMed2005

Is there a characteristic distal tarsal subchondral bone plate thickness pattern in horses with no history of hindlimb lameness?

REASONS FOR PERFORMING STUDY: Osteoarthritis (OA) is a common cause of distal tarsal pain, but disease development is poorly understood. Awareness of normal tarsal structure and function is important in order to understand the pathogenesis of OA. Thickening of the subchondral bone (SCB) plate has been related to the development of OA, but SCB plate patterns in the equine tarsus have not been documented. HYPOTHESES: There is a repeatable pattern of SCB thickness across the distal tarsal joints, and specifically that thickness would be greatest dorsally and laterally. METHODS: Twenty cadaver tarsi were collected from mature horses that had undertaken low-level exercise only with no history of hindlimb lameness. Magnetic resonance images were acquired using a high-resolution sagittal 3-dimensional T1-weighted spoiled gradient echo sequence. Subchondral bone thickness was measured on sagittal images at dorsal and plantar locations on the proximal and distal aspects of the central (CT) and third (T3) tarsal bones and proximal aspect of the third metatarsal bone (Mt3). RESULTS: On the proximal aspect of CT, medial and lateral SCB thickness were significantly greater than midline. On the distal aspect of CT and T3 and proximal Mt3, lateral SCB thickness was significantly greater than medial and midline sites. Dorsal SCB thickness was greatest on the proximal and distal aspects of CT and proximal Mt3. Subchondral bone accounted for a greater proportion of CT and T3 on the dorsal aspect than the plantar. CONCLUSIONS: There is a repeatable pattern of SCB thickness in the distal tarsal bones of horses with no history of hindlimb lameness. This reflects the pattern of loading across the joints. POTENTIAL RELEVANCE: This study provides evidence of a consistent osteochondral pattern in the equine tarsus for reference in identification of osteoarticular pathologies.

Animals↗
PubMed1991

[A return to callus healing using dynamic osteosynthesis procedures. Principles, indications, complications, x-ray diagnosis of interlocking nailing and dynamic monofixators in comparison with conventional bone plates].

A disproportionately high rate of complications such as osteomyelitis, nonunion and refracture after plating have brought about a change in our understanding of the process of fracture healing. Locked nailing and dynamic external Monofixators, however, avoid fracture exposure obviate the necessity of arranging fragments and aim at callus healing of fractures. Fracture hematoma and axial micromovements of these dynamic stabilizing devices are two of the yet known elements to promote callus production.

Bone Nails↗
PubMed1986

A simple instrument for achieving accurate alignment and pre-insertion stability with mandibular bone plates.

The modified Dingman forceps provides several advantages over currently designed plate-holding forceps. The rubber tubing prevents metal-to-metal contact of the forceps on the plate and provides increased stability to the plate. The long lingual jaws of the Dingman forceps are applied to the lingual bone at a point remote from the screw canal, and this prevents damage to the prepared canals. The design of the forceps' jaws provides three-point rigidity to stabilize the plate and, therefore, ensures proper alignment, adaptation, and pre-insertion fixation.

Bone Plates↗
PubMed1977

Massive benign cyst at the site of bone plating: a case report.

A patient with a massive benign cyst occurring in relation to a Sherman plate which had been inserted 30 years previously is reported, and the literature is reviewed. It is suggested that the probable cause was a low-grade inflammatory response to the metal.

Adult↗
PubMedDate not supplied

[In osteogenesis imperfecta no intramedullary nailing and especially no bone plates in childhood].

This is a review of 24 patients with osteogenesis imperfecta of all age groups. 7 severe cases have been followed closely during growth for at least 10 years after multiple series of osteotomies with stabilisation by rodding and plating. The conclusion of the disappointing late results consists in that plating has to be abandoned completely during growth. The indication for rodding has to be restricted severely because of the necessity for replacement of the nails about every two year until cessation of growth. Special operative indications are outlined.

Adolescent↗
PubMed1977

Mandibular staple bone plate implant and prosthesis. Report of a case.

A case treated by the mandibular staple implant fastener system and prosthesis is presented. The phases of therapy, involving preprosthetic surgical preparation, construction of conventional dentures, implantation of the orthopedic appliance, preparation of an interim postsurgical prosthesis, and construction of the definitive prosthesis, are described and illustrated.

Atrophy↗
PubMed1998

[Does surgical approach have an effect on the development of local infection? Animal experiment comparison of conventional open vs. minimally invasive bone plate osteosynthesis (MIPO)].

With a standardised model we investigated the influence of two different surgical approaches to the rabbit tibia for plate osteosynthesis on resistance to local infection after postoperative inoculation of graduated concentrations of staphylococcus aureus at the implant. The infection rate for the minimally invasive plate osteosynthesis with insertion of the implant in closed, soft tissue tunneling technique was 25% (3/12 animals; ID50 = 6.2 x 10(6) CFU) and for the conventional open approach 38% (5/13 animals; ID50 = 2 x 10(6) CFU). This difference is statistically not significant (with P < 0.05).

Animals↗
PubMed1980

Use of compression bone plate after metatarsal nonunion.

In summary, slow union can be caused from impaired blood supply, delayed union by inadequate immobilization, whether external or internal, and infection. Nonunion as well as delayed union may be caused by prolonged movement and interposition of soft tissue. Slow union and delayed union with too early cessation of immobilization cause nonunion. It may be said that if a fracture has not united within 4 months, delayed union is occurring. After 8 months, nonunion or pseudoarthrosis occurs (4).

Adult↗