Sample size calculation Based on a pilot data previously collected by one of the participating surgeons, investigators used sample size estimation to calculate that 240 total patients (120 patients in each group) would be required to demonstrate a difference in subjective patient reported outcome scores (mHHS and HOS-ADL and HOS-Sports) of the two groups with an effect size of 0.8 with an alpha level of 0.05 and power of 80%. Investigators added a potential 20% loss to follow-up in our calculations, which is very conservative. This would leave 100 patients in each group at final follow-up and 200 patients in the study overall. This was powered to detect a clinically significant difference of 2.0 points in mHHS scoring and 3.84 points in HOS-ADL and HOS-Sports. This is well within previously reported minimal clinically important differences between these three outcome scores.