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Results for “Bone Nails”

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At least 37 records · Page 2Linked to original sources
PubMed1985

[Biomechanical analysis of the medullary bone nail and its locking].

By mechanical definition an intramedullary nail is not a nail but rather a bendable feather, subject to longitudinal tension and to a lesser degree to transverse pressure. Reaming the medullary canal is necessary for centralization of the nail as well as to increase the area of contact with the bone. However, this procedure is detrimental to the bone metabolism and reduces its elasticity against torsional forces. The dynamic locking nail-system is more biologic than conventional nailing and it reduces rotatory instability with the help of additional components, such as transverse screws. Only static locking allows true static weight bearing with crutches, but not dynamic mobilisation. Nails with conventional strength and in leaf of trefoil formation are superior to other designs. However, an improved angle in the proximal locking is suggested, as this would allow for a three to four times greater weight bearing.

Biomechanical Phenomena↗
PubMed1980

Küntscher bone nailing -- forecast and actuality.

The first description in the English language of Küntscher nailing by the originator himself in 1948 is reviewed. His predictions regarding its possibilities in bone and joint surgery are compared with their fulfillment in later years.

Biomechanical Phenomena↗
PubMed2007

Reliability of the pulp nail bone (PNB) classification for fingertip injuries.

Evans and Bernardis proposed the 'PNB classification', by which a fingertip injury is classified according to each structure: pulp P, nail N, bone B. The objective of this study was to assess the inter-observer reliability, repeatability and accuracy of PNB. One hundred patients presenting with a fingertip injury were included prospectively, photographed, then classified in randomly chosen orders by nine independent observers. A third were drawn randomly and classified a second time to measure repeatability. A reference classification was also provided by one of the authors of the PNB system. Classifications agreed with the reference in 59% of injuries for P, 55% for N and 54% for B. The Kappa values for inter-observer agreement were 0.520 for P, 0.512 for N, and 0.504 for B; for intra-observer agreement, they were 0.616 for P, 0.658 for N, and 0.577 for B. Although levels of agreement are comparable with results found for other classifications, they are insufficient for use of the PNB classification without improvement.

Adolescent↗
PubMed1991

[Areas of safe use of bone nails on the forearm].

On the basis of the data of topography-anatomical study, carried out at 30 upper extremities, are proposed zones and directions of safe application of wires of the compression-distraction apparatus at 4 forearm levels, developed with allowance made for individual differences in structure and topography of vessels and nerves as well as functional position of the segment. An experimental examination (30 extremities) and clinical approval (30 patients) of the proposed zones and directions have confirmed the practical use of the obtained data that allows to recommend them to be widely introduced into the clinical practice.

Bone Nails↗