The ornamental design for a bonedistractor, as shown and described.
FIG. 1 is a perspective view of a bone distractor embodying the invention.
FIG. 2 is a side view of the bone distractor.
FIG. 3 is a bottom view of the bone distractor.
FIG. 4 is a side view of the bone distractor; and,
FIG. 5 is a top view of the bone distractor.
The broken lines in the drawings represent unclaimed environmental subject matter and form no part of the claim. The bone distractor is shown with a symbolic break in its length. The appearance of any portion of the article between the break lines forms no part of the claimed design.