Comparison between CT- and MRI-based Patient specific matched instruments for total knee arthroplasty

Patient specific matched instruments (PSMI) can be used to align total knee arthroplasty. This technique utilizes CT and MR imaging. The present study is designed to investigate postoperative radiographs, pre operative planning and per operative outcome between CT and MRI based PSMI

There is no difference between CT- and MRI-based
Patient specific matched instruments for total knee arthroplasty

Primary outcome, biomechanical limb alignment, femoral and tibial component position were evaluated on 1 year post operative standardized full leg standing radiographs and sagital plane radiographs

Patient specific matched instruments (PSMI) for total knee arthroplasty (TKA) is a new and upcoming technique that uses 3D rapid prototyped disposable guides to align the knee prosthesis. This case control study will review a cohort (n= 899 cases) of patients operated for unilateral total knee arthroplasty (TKA) with the use of patient specific matched instruments (PSMI; Signature, Biomet, Warsaw INC). This PSMI utilizes CT or MR imaging. Patients operated for TKA who were not eligible to undergo MRI and were operated by means of CT-based PSMI will be included. These patients will be adequately matched on gender, age and body mass index (BMI) with a group of patients operated with MRI-based PSMI (Control group) out of the cohort.