Table 2.

The schedule of trial enrolment, interventions and assessments

	Enrolment	Intervention period
	Pre-OP	6 hours	24 hours	48 hours	72 hours
Enrolment
Informed consent	●
Assessment of eligibility	●
Randomisation	●
Interventions
EA		●	●	●	●
Sham-EA		●	●	●	●
Assessments
VAS	●	●	●	●	●
Additional dose released by PCA				●
HSS scale	●				●
HAMA score	●				●
PONV		●	●	●	●
COK			●		●
Additional use of analgesics	●				●
Postoperative complications and adverse events		●	●	●	●

COK, circumference of knee; EA, electroacupuncture; HAMA, Hamilton Anxiety Scale; HSS, Hospital for Special Surgery; OP, operation; PCA, patient-controlled analgesia; PONV, postoperative nausea and vomiting; VAS, visual analogue score.