This apparatus is of the type comprising a metal part in which channels are formed for engagement of the upper end of the nails. According to the invention, the part (II), of trapezoidal shape in longitudinal cross-section, is intended to be introduced into a seat of corresponding shape formed in the osseous part and to be locked to it, and the ends of the nails (I), situated at the side opposite that where the part (II) is located, are curved. IMAGE
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