Recent developments in 3D printing have gave orthopedic surgeons among a novel technology that has the ability to revolutionize preoperative planning. The appearance of 3D printing technology enables the digital preoperative plan and simulation to move from the virtual phase to the reality phase. Varum disorders are recurrent lower limb malformations associated with many anatomical changes in the knee joint and adjacent segment. High Tibial osteotomy is one of the best treatment options in genuvarus deformity. In this randomized clinical trial study, 16 patients with genuvarum were selected that divided between the 2 groups (main study and the control group). A standing alignment radiograph were taken from all patients to measure mMPTA, mLDFA, CA and mFTA. CT scan was taken from 8 patients in the main study group. Mimics software was used to build the 3D model. Then, we had to prepare the model made for printing by a 3D printer. Finally, the printed 3D model is provided to the orthopeadic surgeon. So, the surgeon operated on half of the patients with the help of a printed 3D model. Orthoped performed an osteotomy on the printed model that was exactly the same as the actual surgery After the surgery, we once again took radiography (all patients) and a CT scan (main study group). The aim is to see if the angles have been corrected after surgery. Finally, a comparison was made between these two surgical procedures. Results showed that the printed 3D model group had lower: 1. cost of hospitalization and anesthesia, 2. duration of surgery, 3. fluoroscopic dose and 4. bleeding.

The laser sintering process allows to create a wide range of parts printed in 3 dimensions (3D). 3D printing is done layer by layer on powders (plastics, juices, polymers), using a laser. SLS printing requires the use of a special gas, nitrogen, SLS 3D printers are made from two enhancement chambers The laser draws the case of each region of the 3D drawing on a bed of powder. Each time a diaper is made, the bed breaks and another diaper is made over the previous layers The bed continues to descend until the last layer is formed and the part is complete, one of the fundamental points of interest of SLS is that it does not need the help structures used by many people. many other manufacturing innovations of added substances to prevent the plane from falling off during creation. The article rests on a bed of powder, no help is fundamental SLS innovation really stands out when you need durable plastic parts. It is equipped to deliver fully solid parts suitable for real life testing and mold making, while other added substance production strategies can become tricky after a while; so mathematical modeling to properly optimize this process is necessary.