Bone weakness after the removal of plates and screws. Cortical atrophy or screw holes?
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چکیده
منابع مشابه
Bone weakness after the removal of plates and screws. Cortical atrophy or screw holes?
Bone weakness leading to refracture is a recognised complication of the removal of rigid fixation plates. We have used partially demineralised rabbit tibiae to simulate atrophic changes and to determine whether weakness is due to atrophy or to residual screw holes. Partial demineralisation and a screw hole each reduced maximum bending moment. However, energy absorbing capacity was little affect...
متن کاملFixation Strength of Caudal Pedicle Screws after Posterior Lumbar Interbody Fusion with the Modified Cortical Bone Trajectory Screw Method
STUDY DESIGN Clinical case series. PURPOSE In the posterior lumbar interbody fusion (PLIF) procedure in our institute, the cephalad screw trajectory follows a mediolateral and caudocephalad directed path according to the original cortical bone trajectory (CBT) method. However, the starting point of the caudal screw is at the medial border of the pedicle on an articular surface of the superior...
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OBJECTIVES To assess whether plate bending at a hole significantly changes the biomechanical properties of a locked screw. METHODS Coronal plane bends of 5-, 15-, or 45-degree angles were placed in 3.5-mm locking compression plates with the apex at a locking hole. An additional 45-degree angle test group was created in which a threaded screw head insert was placed before bending. Ten plates w...
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OBJECT In 2009, Santoni et al. reported cortical bone trajectory (CBT) as a method of inserting pedicle screws to obtain more solid fixation, and proposed the use of cortical trajectory screws with a more closely placed thread (cortical screws) for CBT. Since the entry trajectory in CBT differs from that in the traditional trajectory, it is unclear whether the increased strength derives from th...
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We used single-photon absorptiometry to assess the forearm bones after the removal of internal fixation plates in 14 patients. We found convincing evidence of cortical atrophy in only one patient, in whom the plates had been removed prematurely after only 16 months. It is suggested that such plates should be retained for at least 21 months, to allow bone density to return to its prefracture lev...
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ژورنال
عنوان ژورنال: The Journal of Bone and Joint Surgery. British volume
سال: 1991
ISSN: 0301-620X,2044-5377
DOI: 10.1302/0301-620x.73b2.2005156