Comparison of Operative Times in Primary Bilateral Total Knee Arthroplasty Performed by a Single Surgeon.

The Jonckheere–Terpstra test showed a trend toward decreasing OT with calendar year on the left side ( p = 0.037) (surgeon’s non-dominant side), but not on the right ( p = 0.795).

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The results of the Jonckheere–Terpstra test showed a significant trend in decreasing operative time with calendar year for surgeries on the left side ( p = 0.037) ( Figure 2 A) but not the right side ( p = 0.795) ( Figure 2 B).

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