Subsequent total joint arthroplasty: Are we learning from the first stage?

Table 1 Demographic data for arthroplasty patients based on procedure number

	First procedure	Second procedure	P value
Arthroplasty (n = 1286)
Age (yr)	65.0 (58.0, 71.0)	66.0 (58.0, 72.0)	0.185
BMI (kg/m2)	30.5 (26.6, 34.9)	30.4 (26.5, 35.1)	0.920
Female sex	362 (56.4)	362 (56.4)	1.000
ASA 1 or 2	373 (58.1)	370 (57.6)	0.865
Total knee arthroplasty (n = 728)
Age (yr)	66.0 (61.0, 72.0)	67.0 (62.0, 73.0)	0.218
BMI (kg/m2)	31.3 (27.4, 35.7)	31.5 (27.5, 36.0)	0.878
Female sex	210 (57.7)	210 (57.7)	1.000
ASA 1 or 2	193 (53.0)	192 (52.7)	0.941
Total hip arthroplasty (n = 556)
Age (yr)	62.0 (54.0, 69.0)	62.0 (54.0, 70.0)	0.468
BMI (kg/m2)	28.9 (25.5, 33.4)	29.2 (25.7, 33.0)	0.734
Female sex	152 (54.7)	152 (54.7)	1.000
ASA 1 or 2	180 (64.7)	178 (64.0)	0.859

Continuous data are presented as median (lower quartile, upper quartile). Categorical data are presented as count (percent). BMI: Body mass index; ASA: American Society of Anesthesiologists.

Table 2 Patient outcomes for arthroplasty patients based on procedure number

	First procedure	Second procedure	P value
Arthroplasty (n = 1284)
OR time (min)	99.0 (86.0, 119.0)	96.0 (86.0, 113.0)	0.039
Length of stay (d)	2.26 (1.40, 3.14)	2.09 (1.28, 2.41)	< 0.001
Discharge to SNF	120 (18.7)	106 (16.5)	0.305
90-d ED return	48 (7.5)	47 (7.3)	0.915
90-d readmission	19 (3.0)	24 (3.7)	0.438
30-d readmission	14 (2.2)	15 (2.3)	0.851
Total knee arthroplasty (n = 728)
OR time (min)	97.0 (85.0, 118.0)	97.0 (86.0, 113.0)	0.654
Length of stay (d)	2.3 (2.09, 3.19)	2.21 (1.33, 2.47)	< 0.001
Discharge to SNF	82 (22.5)	72 (19.8)	0.364
90-d ED return	23 (6.3)	30 (8.2)	0.318
90-d readmission	8 (2.2)	9 (2.5)	0.806
30-d readmission	7 (1.9)	7 (1.9)	1.000
Total hip arthroplasty (n = 556)
OR time (min)	102.0 (88.0, 121.0)	96.0 (85.0, 112.0)	0.011
Length of stay (d)	2.21 (1.36, 2.48)	1.38 (1.23, 2.32)	< 0.001
Discharge to SNF	38 (13.7)	34 (12.2)	0.530
90-d ED return	25 (9.0)	17 (6.1)	0.199
90-d readmission	11 (4.0)	15 (5.4)	0.422
30-d readmission	7 (2.5)	8 (2.9)	0.794

Continuous data are presented as median (lower quartile, upper quartile). Categorical data are presented as count (percent). SNF: Skilled nursing facilities; ED: Emergency department; OR: Operating room.