All surgery involves breaking through the skin and accessing a part of the body that is normally separate from the outside world. Any time that happens, there is the risk of infection. Additionally, blood clots occur in patients with risk factors and who do not move for some time. Although this surgery is relatively short, it still presents a risk for blood clots. Lastly, any time skin is passed through, there is a risk for vessel injury. This may cause bleeding into the joint.