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At least 109 records · Page 6Linked to original sources
PubMed1983

Evaluation of metacarpal bone plates in the mandibular fracture.

Of 1587 mandibular fractures, 75 (4.7 per cent) were treated by open reduction with metacarpal bone plates. The plated fractures were reviewed and evaluated for failure. Seventeen plates of the 96 placed were removed (17.7 per cent). Infection was the major cause of failure (9.4 per cent). Operator error played a role in the failure of eight out of 17 plates (47.1 per cent). Various aspects were studied in order to find the significant factors present, and these are discussed.

Adult↗
PubMed1977

Compression bone-plating: historical considerations.

Compression of bone fragments to accelerate, or at least facilitate, bone healing was first applied in 1932 by Key to arthrodesis of the knee. Subsequently the same principle was applied to fractures, first by percutaneous pins as developed by Roger Anderson and then by implanted compression plates. Two types of compression plate have been evolved. One employs an axially oriented force produced by a separate screw or temporarily applied compression device, designed just for this purpose, as originated by Danis in 1949. The other, devised by me in 1956, is a so-called self-compressing plate, which generates compression force by inserting eccentrically placed chamfered screw-heads into slots in the plate so that the screws (as well as the bone fragments in which they are inserted) are translated toward each other. Numerous modifications of these two basic designs are now available.

Bone Plates↗
PubMed1983

Intramedullary migration of a bone plate and screws. A case report.

Intramedullary migration of an internal fixation device was noted in a 61-year-old woman, 56 years after treatment of a fractured femur. Gross, histologic, and metallurgic findings served to explain the disintegration of the metal plate and screws. The "migration" of the plate and screws is a manifestation of normal bone growth and demonstrates the remarkable potential for internal remodeling of bone.

Biodegradation, Environmental↗
PubMed1988

Use of mini-fragment bone plates for reduction of midface fractures.

A technique for using small plates in the management of midface fractures is presented. Principles of fracture management are similar to wire osteosynthesis. Anatomic rigid reduction allows more precise control and stabilization of the midfacial bone fragments, particularly the frontal process of the maxilla and the medial canthal region. In addition, rigid fixation aids in preventing inferomedial displacement of the zygomatic complex by the masseter muscle. The vertical dimension of the midface can be reestablished and stabilized by bone plate fixation without the need for suspension wires. Immediate opening of the mouth afforded by rigid fixation facilitates safe airway management, patient comfort, better oral hygiene, and speech and may circumvent the need for tracheostomy when concomitant nasal fractures are present.

Adult↗
PubMed1994

Comparison of craniofacial growth after rigid fixation with autogenous bone plates and with metal plates.

This study was undertaken to determine whether rigid fixation using autogenous cranial bone grafts restricts craniofacial growth less than metal plates in 7-week-old Yorkshire pigs. A rectangular 10 x 20 mm segment of bone centered on the right coronal suture was resected. Animals were randomly assigned to one of three experimental groups: (1) rigid fixation across the defect using the bone graft rotated 90 degrees and attached with four microscrews; (2) rigid fixation across the defect using two microplates attached with four microscrews; or (3) no rigid fixation, with four microscrews placed to serve as radiologic markers. All animals were followed up with serial radiographs, and 8 months after the surgery direct measurements were performed on dry skull preparations. The greatest lengths were in the control group, followed by the bone plate and then the metal plate groups, but these differences were not statistically significant. The cranial width was significantly greater in the bone plate group, suggesting that a growth center may have been reoriented.

Animals↗
PubMed1989

Bone-plates and screws of bioabsorbable poly (L-lactide)--an animal pilot study.

Poly (L-lactide), a polymer of lactic acid (PLLA), with an extremely high molecular weight (Mv up to 1 x 10(6] has been synthesised under strictly controlled conditions resulting in a new microporous material with excellent mechanical properties. Bone-plates and screws machined from PLLA were used for fixation of two artificial mandibular fractures in sheep effected by a specially designed bone clamp. Fracture healing was uneventful without visible callus formation. Plates and screws of PLLA gave good stability over a sufficiently long period to enable normal fracture healing. Application in humans seems to be justified.

Absorption↗
PubMed1979

Treatment of initially infected mandibular fractures with bone plates.

Use of the self-compression plate has proved to be a reliable method for treatment of various mandibular fractures. It has been uncommon, however, to use the plates in preoperatively infected mandibular fractures. Based on acceptable results in general traumatology for cases with open-wound fractures, I inserted bone plates into initially infected mandibular fracture sites. The purpose of this paper is to report the results.

Anti-Bacterial Agents↗
PubMedDate not supplied

Outcome of plating, bone grafting and shortening of non-union humeral diaphyseal fracture.

BACKGROUND: Humeral diaphyseal fracture usually heals with closed methods but when non union develops then it needs surgical intervention in the form of plating and bone grafting, intramedulary nailing (open or closed simple or interlocking nails) and external fixators (circular or one plane fixator). In our unit we treated non union humeral diaphyseal fracture with plating and bone grafting and shortening of fracture ends up to 4 to 5 cm when needed. METHODS: This study was conducted at Orthopaedic Department of Ayub Teaching Hospital Abbottabad from January 2002 till December 2003. We included 15 cases with atrophic non-union in 9 (60%) and hypertrophic non-union in 6 (40%) patients. All atrophic non-union were treated with plating, bone shortening by transverse osteotomy and bone grafting, while hypertrophic non-union were treated with decortications of non-union ends and fixation with compression plates, with bone grafting in old age. Follow up measures were based on clinical (range of joints motion) and radiological (healing) findings. Follow up was done for up to 6 months. RESULTS: Out of 15 patients the age range was 20-80 years, 12 (80%) were male and 03 (20%) female. Right humerus involved in 5 (33.33%) while left humerus in 10 (66.66%) patients. In 9 (60%) patients with atrophic non union bone shortening by transverse cut osteotomy was done while in remaining patients with hypertrophic non-union plating was done in 2 (13.33%) cases and plating with bone grafting in 4 (26.66%) patients. Union was achieved in all patients after 16 to 20 weeks of surgery. In one patient (6.66%) of 75 years age with hypertrophic non-union implant was loosened after 03 months of surgery. At that time healing (Union) was evident on X-rays and humeral brace was applied for further 03 months. Two patients (13.33%) got neuropraxia of radial nerve which resolved with in 3 months time. 02 patients (13.33%) developed shoulder stiffness which resolved after exercise. CONCLUSION: In Non Union of Humerus shortening by transverse osteotomy & rigid fixation with plates give excellent results in selected cases.

Adult↗
PubMedDate not supplied

The mineralization patterns at the subchondral bone plate of the glenoid cavity in healthy shoulders.

The distribution of mineralization of the subchondral bone plate (DMSB) is used as a parameter for the individual stress distribution of joints. In this study the DMSB of the glenoid from healthy glenohumeral joints was analyzed. In a standardized manner, 44 macroscopically normal shoulder specimens (28 individuals aged 18 to 96 years) were selected and DMSB of the glenoid was evaluated by computed tomography osteoabsorptiometry. The mineralization patterns were described, and the 2 most frequent maxima of density were localized and statistically assessed to analyze any influence of age, side, or shape of the glenoid on DMSB. An anterior-superior maximum was found in 100% and a posterior maximum in 82%. Three different patterns of DMSB were distinguished in relation to the constant anterior-superior maximum: 68% were not combined with a further central or anterior-inferior maximum (type A), whereas a central maximum coexisted in 18% (type B) and an anterior-inferior maximum in 14% (type C). The localization of the anterior-superior and posterior maxima was independent of age or side of the glenoid, indicating a constant long-term stress distribution in healthy glenohumeral joints. The typical localization of the density maxima showed that stress distribution is usually peripherical (82%) and often bicentric. Functional aspects related to internal rotation of the arm support a more constant anterior than posterior stress on the glenoid surface.

Cadaver↗
PubMed2004

Treatment of chronic mandibular dislocations by bone plates: two case reports.

BACKGROUND: Various surgical procedures have been used to limit mandibular opening in patients with recurrent dislocations of the temporomandibular joint (TMJ). These include intracapsular injection of sclerosing agents and tethering of the mandible. Other methods include obstruction of the condylar translation by downfracturing the zygomatic arch or by bone graft augmentation of the tuberculum and creating a mechanical impediment using Vitallium mesh or a stainless steel pin. MATERIAL: In this paper, two patients are described in whom the range of condylar movement was restricted by a bone plate attached to the lateral surface of the zygomatic arch. One arm of the plate was extended medially just below the articular eminence. One patient had a hypermobile joint in combination with mitral valve prolapse, and the other patient suffered mental retardation. The surgical technique is described in detail. RESULT: Six months postoperatively, TMJ function was unimpeded and there was no recurrence of condylar dislocation.

Adult↗
PubMed1975

[Biomechanical tests on osteosynthesis with small-bone plates (author's transl)].

Plating in handsurgery has become a more frequently used method since the special instruments of the Swiss AO and the self-compression plates of Mittelmeier (made by Osteo AG) have been introduced. The results of biomechanical measurements, comparing the interfragmental compression power and tensile strength of the small-fragment-plates of the AO with the crescent-formed plates of Mittelmeier are reported. The compression power of the first reach their maximum by 8 kp, the latter an average of 20 kp. A gapping of the fracture occures under a deflection-momentum of 4 kp - cm using AO-plates and 10 kp - cm using the crescent-formed plates. The bending stiffness under deflection momentum to the off side of the plate is in the crescent plate 10 times higher. Only an angulating bending in the middle gives in both plates an all over good contact to the fragments. Finger osteosyntheses are very rigid against a deflection momentum in the level of the plate. (Regarding that, we fixe the plate sidewise on the bone.) Our conclusion is, that the better biomechanical stability of the self-compression plates--Mittelmeier-plates--is a result of the higher compression powers.

Biomechanical Phenomena↗