For a bone lesion close to a ball and socket joint, I tend to use 35 Gy in 5 fractions in order to decrease the risk of damage to the cartilage. I usually expand 5 mm from GTV to generate a CTV with trimming of the portions that go beyond the bone if no extraosseous extension. I also expand a 2-3 mm...

Please refer to @Simon S. Lo's answer.