Objective activity tracking in spine surgery: a prospective feasibility study with a low-cost consumer grade wearable accelerometer.

This number decreased by 78% to 1667 (SD 1824; p < 0.001; median 953) in the first postoperative week and remained 49% lower during postoperative week 2 (mean 3820; SD 3491; p < 0.001; median 3226), 28% lower during postoperative week 4 (mean 5359; SD 2692; p = 0.015; median 5372) and 20% lower during postoperative week 8 with borderline significance (mean 5983; SD 2559; p = 0.050; median 6207).

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