You can see in the circled image a student using a hammer and chisel on an object.  I’m currently trying the hammer method with a ball pein hammer.  Unlike suggested in the post I am currently tapping the epiphysis of the bone and not just the diaphysis and I am not using a chisel because I think it is too cumbersome.  Now it’s possible that the hammer here is being used to cause a fracture rather than as a bone stimulatory agent, I’m just suggesting that using a lateral impact force is not unheard of.  Also, the method alluded to in the poster would have the issue that the hammer would puncture the skin(hence why I’m trying a ball pein hammer).

Also of note in the poster(and circled) Is that salubrinal and joint loading is used on articular cartilage and it seems to be noticeably thicker than even the control group.  Also if you look at the rat foot on the same line.  the salubrinal(and joint loaded) treated group looks longer than the osteoarthritis group but that could be an optical illusion.