A prosthesis includes a bone anchoring element and a meniscal element capable of being installed on this anchoring element which includes a medullary anchor shaft with a hollow interior, defining a cavity, and a transverse rod fixed and extending through this cavity, and the meniscal element includes an assembly shaft intended to be engaged in the cavity, this assembly shaft having a longitudinal slot having a width smaller than the transverse section of the transverse rod, one end of which opens in the free end of the assembly shaft and the other end of which opens in a transverse hole having a cross-section slightly larger than that of the transverse rod, the assembly shaft intended, thanks to this slot, to be engaged on the transverse rod until engagement of the transverse rod in the transverse hole, with locking, when the meniscal element is in its assembled position on the bone anchoring element.
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