Table 1.

RACER-Hip SPIRIT outcomes and assessment schedule

Time point	Study period
	Enrolment	Baseline (pre-allocation)	Allocation	Post-allocation
	−t2	−t1	0	t1 Days 1,2,3	t2 6 weeks	t3 3 months	t4 6 months	t5 12 months	t6 24 months	t7 5 years	t8 10 years
Enrolment
Eligibility screen
Informed consent	✓
Randomisation	n=378		✓
Interventions
Robotic THR			n=189
Conventional THR			n=189
Assessments
Primary outcome	FJS	✓				✓	✓	✓	✓	✓	✓
Secondary outcomes	Pain intensity (NRS 11 point)	✓			✓	✓	✓	✓	✓	✓	✓
	Opioid usage			✓
	Estimated blood loss			✓
	Time to discharge			✓
	Oxford Hip Score	✓				✓	✓	✓	✓	✓	✓
	EQ-5D-5L	✓			✓	✓	✓	✓	✓	✓	✓
	Post operative CT measures and process outcomes					✓
	Resource use					✓	✓	✓	✓	✓	✓
	Participant satisfaction							✓

EQ-5D-5L, EuroQol five dimensions; FJS, Forgotten Joint Score; NRS, Numerical Rating Scale; RACER-Hip, Robotic Arthroplasty Clinical and cost Effectiveness Randomised controlled trial for Hips; SPIRIT, Standard Protocol Items: Recommendations for Interventional Trials; t, time point; THR, total hip replacement.