Search PubMed⌕ Search

SEARCH · Search PubMed

Results for “Internal Fixators”

Search indexed PubMed citations on genomics, clinical trials, systematic reviews and public health. Explore titles, authors and supplied subject terms, then open the PubMed record.

Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.

At least 541 records · Page 30Linked to original sources
PubMed1988

Internal fixation of an unstable open fracture of a distal phalanx with a Herbert screw.

A 20-year-old patient was seen with an unstable, infected, open fracture of the distal phalanx of the long finger of the right dominant hand. The patient was treated by removal of the nail, debridement of the fracture site, and stabilization of the fracture with a Herbert screw. The Herbert screw compressed the fracture site and allowed early active motion of the distal inter-phalangeal (DIP) joint. The wound healed without incident, and the fracture was radiographically united 6 weeks after the procedure. The Herbert screw is useful in the treatment of unstable fractures of the distal phalanx, since the screw maintains reduction, compresses the fracture site, and allows early active motion of the DIP joint.

Adult↗
PubMed1998

Open reduction and internal fixation of unstable distal radius fractures with a low-profile plate: a multicenter study of 73 fractures.

A study of acute, dorsally displaced, unstable (high-energy) fractures of the distal radius was conducted to determine the safety and efficacy of a new low-profile plate for unstable distal radius fractures. Thirteen surgeons in 11 US cities participated in the study. A minimum follow-up period of 1 year was required to be included in the study. Seventy-three fractures in 71 patients met this criterion. Each fracture was treated according to a prospective protocol. An autogenous bone graft was used in 64 fractures. All procedures were completed using a radiolucent sterile traction table. No external fixators were used either during or after the operation. After bone grafting and while in traction, a fracture reduction clamp with a template preshaped to the normal contour of the dorsal radial metaphysis molded the fracture into reduction and then allowed precision drilling of the holes for the plate. Active wrist motion began at an average of 14 days. Satisfactory open reduction was obtained in 93% of the fractures and maintained in 88%. Ninety-five percent of the fractures demonstrated good or excellent outcomes using a standardized evaluation. Eighty-one percent of the outcomes were rated as excellent. This initial report demonstrates that the method is a safe and effective treatment for acute, unstable, dorsally displaced fractures of the distal radius.

Adolescent↗
PubMed1997

Treatment of humeral pathological fractures by internal fixation and methylmetacrylate injection.

Between 1986 and 1993, 18 patients with complete or impending fractures of the humerus were treated using Hacketall rods in association with semi-liquid methylmetacrylate after excision of the metastatic lesion. Methylmetacrylate was always injected proximally and distally to the curetted bone through drill holes. Fourteen patients had a pathological fracture and four presented with an impending lesion. The mean age at time of surgery was 62 years (range: 42-83). The primary tumour was a breast carcinoma in 10 cases, bronchogenic squamous cell carcinoma in three cases and hypernephroma, multiple myeloma, malignant melanoma, rectal adenocarcinoma and unknown primary tumour in one case each. The left arm was involved in seven cases and the right in 11. All patients experienced immediate relief from the pre-operative pain, although three patients complained of a residual discomfort during motion. In these three cases the residual pain can easily be managed with use of oral non-morphinic drugs. The functional aspect was not evaluated in two patients who died in the early post-operative period as a result of their general condition. In 15 patients, the post-operative range of motion was at least 80% of a normal humerus mobility. One patient encountered motion limitation because of an important lymph oedema. There was no infection, one patient had a temporary radial palsy with a complete restoration after a period of 5 days. No migration of the material was observed during an average follow-up of 9 months (range: 1-24).

Adult↗
PubMedDate not supplied

Nonunions of the surgical neck of the humerus: surgical treatment with an intramedullary bone peg, internal fixation, and cancellous bone grafting.

Twenty patients with pseudarthrosis of the upper humerus underwent surgery with the intramedullary bone peg technique. A 6 to 10 cm corticocancellous autogenous bone graft (11 iliac crest, 6 anterior tibial crest, 3 middle-third of the fibula) was pegged] into the humerus and bridged the pseudarthrosis. Stability of the fracture site was obtained by plate osteosynthesis; an additional peripheral cancellous graft was performed. Our patient series included 15 women and five men with an average age at operation of 58 years; the dominant side was involved in 12 cases. Eleven had undergone 22 previous operations. The average delay between fracture and surgery was 12 months, (range 6 to 72 months). The patients were monitored an average of 42 months (range 12 to 120 months). Union was confirmed in 19 cases; the last case demonstrated no peripheral callus. No necrosis of the humeral head was seen. Active anterior elevation of the shoulder improved from an average of 60 degrees to an average of 131 degrees. According to Constant's scale adjusted according to age and sex, the results obtained averaged 81.2%. Subjectively, 65% of patients were very satisfied, 30% were satisfied, and 5% were disappointed. The rate of union (96%) is in contrast with the results reported in the literature, underlining the importance of an intramedullary bone graft in association with peripheral osteosynthesis in the treatment of pseudarthrosis of the surgical neck of the humerus.

Adult↗
PubMed1999

Avascular necrosis of the femoral head after open reduction and internal fixation of femoral neck fractures: an inevitable complication?

Between 1980 and 1989 71 patients with a femoral neck fracture were treated at the University Hospital of Basel by a Dynamic Hip Screw (n = 54) or by three compression screws (n = 17). Fifty out of 71 patients (70%) were reviewed clinically and radiologically after an average of 116 months. 32/50 fractures (64%) had united. In 18/50 (36%) either avascular necrosis (12) or secondary fracture dislocation (6) had resulted in failure after an average of 29 months following injury. Despite these results, the patients assessment had been very good or good in 44 patients (88%) and fair only in six patients (12%). The cause of secondary dislocation proved to be mainly due to a technical failure at surgery. The incidence of avascular necrosis was significantly higher in displaced fractures compared to non-displaced fractures (p < 0.05), regardless of the quality of the reduction achieved (varus or valgus) or the time delay between accident and operation. However it was interesting to note, that more than one third of all avascular necrosis became apparent more than 3 years (4-10 years) after the accident.

Adult↗
PubMed2001

A computer study of biodegradable plates for internal fixation of mandibular angle fractures.

PURPOSE: This computer-based study was performed to determine the suitability of small biodegradable plate systems for mandibular angle fractures. MATERIALS AND METHODS: In a 3-dimensional computer model of the mandible, fracture mobility and plate strain were calculated for bite forces applied on 13 bite points on the dental arch. The angle fracture was fixed with 2 polylactide (PLA) midiplates or with 2 PLA maxiplates. The first plate was positioned buccally on the external oblique ridge. Two positions of the second plate were studied: halfway up the height of the mandible or on the lower border. Maximum fracture mobility was set at a limit of 150 microm to enable undisturbed fracture healing. Maximum plate strain was set at the yield strain of PLA. RESULTS: Fixation with the PLA maxiplates, with the second plate positioned halfway up the height of the mandible, resulted in fracture mobility below the set limit for all bite points. For the other PLA fixation strategies, fracture mobility exceeded the set limit. Fixation with the second plate positioned halfway up the height of the mandible generally resulted in less fracture mobility than with the plate positioned on the lower border. The yield strain of PLA was not exceeded in any of the fixation strategies. CONCLUSIONS: Based on the computer model, 2 PLA maxiplates are suitable for fixation of mandibular angle fractures. One plate should be positioned buccally on the external oblique ridge, and the other should be positioned halfway up the height of the mandible.

Absorbable Implants↗
PubMedDate not supplied

Mechanical comparison of 3 different clamp and 2 different rod types of a new veterinary internal fixation system, 4.5/5.5-mm VetFix.

OBJECTIVE: To compare the gripping force of a standard clamp with click-on and T clamps of the 4.5/5.5-mm VetFix (AO Research Institute, Davos, Switzerland), mounted on smooth and roughened rods. STUDY DESIGN: In vitro mechanical study. METHODS: Rods were mounted on a clamp-holding device. Each clamp type was tested on a materials-testing machine in groups of 6 specimens for torsional and axial load stability on smooth and roughened rods (total, 72 specimens). The variable evaluated was the discontinuity point (DP) as a measure for gliding resistance of the clamp on the rod. Means (+/-SD) were calculated for all groups separately. For statistical comparison, a multiple regression model was fitted with level of significance set at P =.05. RESULTS: The direction of torsion had a significant effect on DP for both asymmetric clamps (standard, click-on). In torsion and axial load, the roughened rod had significantly higher DP levels than the smooth rod for the standard clamp. Rods differed only in axial load for the T clamp, again favoring the roughened rod. The click-on clamp did not reach 10% of the values achieved by the other clamps, independent from the rods and loading conditions. Compared with the T clamp, standard clamp DP values were significantly higher in torsion on the roughened rod as well as in axial load on both rod types. CONCLUSIONS: The roughened rod with a standard clamp was mechanically superior. For the T clamp, the small loss of gripping force may be compensated for by the possibility of inserting 2 more screws. CLINICAL RELEVANCE: The roughened rod may enhance the bending, compressive, and torsional properties of the 4.5/5.5-mm VetFix system by reducing the risk of clamp gliding on the rod. The standard clamp is the clamp of choice, except for the metaphyseal or epiphyseal region, at which use of a T clamp may be indicated to increase the number of screws inserted at the end of the rod.

Animals↗