Abstract
Introduction
For the total hip cases with severe bone defect, using acetabular reinforcement plate is one of effective method. But the shape of every defect is different. So it is very important to make it into proper shape. It would be not only time consuming but also the procedure requires many times trial insertion through the muscle which can be a cause big damage on it. To reduce the time and the damage, we have manufactured a chemical wood model for each case and shaped each acetabular reinforce plates.
Materials and Methods
Three total hip cases, one primary case of rheumatoid arthritis with big bone absorption and 2 revision cases with big bone absorption were operated with acetabular reinforcement plate (LIMA Italy) shaped on their pelvic chemical wood model. Using Mimics®, CAT scan DICOM data were transferred STL CAD data. Then using Magics® chemical wood model was designed and manufactured by a compact CNC machine. Then each plate was bent and fitted for each defect 3-Dimensionally.
Results
In all three cases, the acetabular reinforcement plates were inserted without any more shape modification.
Discussion
It is very difficult to estimate how long the surgical time was saved and how much soft tissue damage was reduced. However, every preoperative shaping took more than 15 min even we can use not only plate benders but also vise and other tools. We had to check the plate fitting to the model at leased 10 times. Therefore, this procedure could be said that it has save at least 15 min and muscle damage for 10 times trial. For better estimation, we are going to record how long we need for the preoperative shaping and how many times we need to check fitting on the model.
