Surgery – Truss – Perineal
Patent
1977-05-20
1979-01-23
Yasko, John D.
Surgery
Truss
Perineal
128 92B, A61F 504
Patent
active
041355075
ABSTRACT:
The condylocephalic nail of this invention is designed to attain an optimal nail position in the head-neck fragment of the femur, and, to this end, is provided with a curve as viewed in the frontal or anterior-posterior (AP) plane, which places the upper portion of the nail adjacent to the medial cortex at the level of the lesser trochanter and also places it approximately parallel with the primary trabeculae of the head, i.e., at an included angle of about 160.degree. with respect to the shaft of the femur. The relatively high angle of the upper end of the nail was chosen in order to place it closely parallel to the stress lines encountered by the head and neck of the femur during ambulation. In order to achieve accurate rotatory alignment and to obviate external rotatory malalignment of the femur, the nai is provided, as viewed from the medial side, with a gentle S-shaped curve, in which the upper end or head of the S is formed with an anteversion curve of between about 5.degree.-15.degree. and the remainder, or body portion, of the S-shaped curve is formed with an included anterior-posterior angle of between about 155.degree.-175.degree.. The optimum angle for the S-shaped curve is about 8.degree. for the anteversion portion and about 170.degree. for the included anterior-posterior angle.
REFERENCES:
patent: 2998007 (1961-08-01), Herzog
patent: 3709218 (1973-01-01), Halloran
patent: 4055172 (1977-10-01), Ender et al.
Drucker I. Morley
Yasko John D.
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