Comparison of the Effect of Different Local Analgesia Administration Techniques in Total Hip Arthroplasty: A Retrospective Comparative Cohort Study

Table 2

Comparison of NRS scores among the three groups.

	Control group (N = 113)	PAI group (N = 87)	IAI group (N = 81)	value	95% confidence interval
NRS scores
Preoperative	5.5 ± 2.1	6.3 ± 2.1	6.5 ± 2.2	C versus P: 0.0110	0–2.0
				C versus I: 0.0024	0–2.0
				P versus I: 0.7757	−1.0–1.0
POD 1	4.7 ± 2.4	3.8 ± 2.4	3.9 ± 2.8	C versus P: 0.0142	−2.0–0
				C versus I: 0.0444	−2.0–0
				P versus I: 0.9939	−1.0–1.0
POD 7	2.3 ± 1.7	1.8 ± 1.6	1.6 ± 1.4	C versus P: 0.0278	−1.0–0
				C versus I: 0.0322	−1.0–0
				P versus I: 0.9985	−1.0–1.0

Values are expressed as mean ± standard deviation. NRS, numeric rating scale; PAI and P, periarticular injection; IAI and I, intra-articular injection; C, control; POD, postoperative.