Table 3.

Results of regression analysis testing for associations between 11 factors and revision events

Factor	Linked with revision event?
Tibial polyethylene shelf age	Yes (p < 0.01)
Release of lateral collateral ligament and popliteus	Yes (p < 0.01)
Patient age	No
Patient weight	No
Patient gender	No
Preoperative tibiofemoral valgus angle	No
Postoperative tibiofemoral valgus angle	No
Use of titanium baseplate	No
Use of sagittally flat insert	No
Release/pie-crusting of iliotibial band	No
Recession/release of posterior cruciate ligament	No

Cox proportional hazards regression analysis was used to identify if the 11 listed factors were associated (p < 0.05) with an event of revision as a result of tibial polyethylene wear, osteolysis, or instability (the time variable of the analysis for each of the 100 knees was the number of years that had elapsed from the date of surgery to the date that the implants were last known to be in situ).