The Effect of Patient-Specific Instrumentation Incorporating an Extramedullary Tibial Guide on Operative Efficiency for Total Knee Arthroplasty

Total 166 patients were included in this study without loss of follow up. Group 1(n =48) : PSI without extra-medullary (EM) tibial guide 50s : 2 60s : 20 70s: 26 Group 2(n = 68) : PSI with EM tibial guide. 50s : 3 60s : 29 70s : 36 Group 3(n = 50) : conventional instrumentation (CI) group. 50s : 2 60s : 18 70s : 30 No significant complications in all groups TABLE 1: Patient demographics. TABLE 2: Comparison of surgical time, operative room time, and blood loss from each group. TABLE 3: Thickness differences of proximal tibia between the pre-planned and actual resection. TABLE 4: Comparison of outliers on tibial posterior slope and tibial rotation angles between PSI and CI after TKA. The mean surgical time was significantly shorter in the PSI with EM tibial guide group (group 2, 63.9 ± 13.6 min) compared to the CI group (group 3, 82.8 ± 24.9 min) (P < .001). However, there was no significant difference in the PSI without EM tibial guide group (group 1, 75.3 ± 18.8 min).