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U-Boot Type II,VII,IX by Waldemar Trojca

By Waldemar Trojca

Книга U-Boot kind II,VII,IX U-Boot variety II,VII,IX Книги Вооружение Автор: Waldemar Trojca Формат: pdf Размер: 16,9 Язык: Английский0 (голосов: zero) Оценка: Фотоальбом о немецких подводных лодках времен Второй мировой войны.

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Extra info for U-Boot Type II,VII,IX

Sample text

A curved stem in profile is straight in the frontal view (b). A curved stem usually stabilizes by means of a three-point support (c) 13,5 mm 13,5 mm Fig. 8 Geometric characteristics of a tapered stem: A long tapered stem always has a cylindrical segment (a). Small taper angle of 2°: entire tapered zone is usable (b). Bigger taper angle of 3. 5°: the distal tapered zone is unusable (c) A tapered configuration entails geometrical characteristics. The surgeon must be aware of them when making a choice and when wedging the final implant into place.

1 The Morphotype (Fig. 1) Evaluate the femur in the frontal and sagittal plane on X-rays taken on a length of 15 cm beyond the loose Straight femur a b Radiographic Analysis of the Femur implant. Draw the centro-medullary axis on an a/p view. If the axis is lateralized in the metaphyseal region, or, more rarely, medialized, the femur is considered as curved. Depending on the presence or not of a femoral curvature, there two choices: Curved femur c d e Fig. 1 (Left panel) Straight femur. Straight femur in the frontal plane (a) and slight curvature in the sagittal plane (b).

Nb. Bone lesions due to stress shielding affect normally both cortices and are classified as stage 4 if the bone density is considerably decreased or the cortices thinned. 26 5 The Cement (Fig. 3 Implanting an uncemented revision prosthesis requires the complete ablation of the cement in situ. It is thus important that the surgeon has a good understanding of the difficulties that could arise. Evaluate the cement bed as a whole and take a b c Radiographic Analysis of the Femur into account the quality of the cortices: cement plug and thickness of the cement as well as the position of the distal extremity of the implant (a/p and lateral view).

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