Precise acetabular positioning, discrepancy in leg length, and hip offset using a new seven-axis robot-assisted total hip arthroplasty system requires no learning curve: a retrospective study

Table 2 Comparison of data values of Learning group vs. Proficiency group and Proficiency group vs. Conventional group

	Learning group	Proficiency group	P-value	Conventional group	P-value
Duration of surgery	129.12(10.71,107–147)	94.43(18.04,63–136)	0.000*	84.86(14.26,57–129)	0.001*
Cup anteversion	20.92(7.93,8.10–39.60)	19.96(5.68,4.50–33.60)	0.573	17.84(6.81,4.10–35.50)	0.049*
Cup inclination	37.59(5.60,24.10–44.50)	38.97(4.78,30.30–50.10)	0.314	40.18(4.59,28.40–49.20)	0.127
Lewinnek safe zone (%)	14 (82.4%)	57 (90.5%)	0.347	62 (77.5%)	0.039*
LLD, mm[M(IQR)]	7.0 (3.0)	6.0 (5.0)	0.251	8.09 (4.33)	0.000*
Acceptable LLD (%)	15(88.2%)	60 (95.2%)	0.290	69(86.3%)	0.073
Offset-D, mm[M(IQR)]	3.12 (2.15)	2.83 (2.30)	0.934	3.45 (2.40)	0.067
Acceptable offset (%)	15 (88.2%)	57 (90.5%)	0.785	69(86.3%)	0.438
Postoperative HHS	92.12(7.47,77–100)	89.03(7.72,68–100)	0.145	88.76(5.79,72–100)	0.818

LLD Leg length discrepancy, HHS Harris hip score; Offset-D = offset discrepancy; *statistically significant difference (P < 0.05)

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