Prior leg length discrepancy in total hip arthroplasty patients causes greater implant complications and faster time to revision

Table 1 Demographic and comorbidity characteristics of total hip arthroplasty patients with leg length discrepancy and a matched-control cohort, n (%)

Patient demographics	Leg length discrepancy, n = 2038	Control, n = 10165	P value
Age (mean ± SD)	62.5 ± 13.0	62.6 ± 12.9	0.805
Gender			1
Female	1163 (57.1)	5802 (57.1)
Male	875 (42.9)	4363 (42.9)
Comorbidity
Alcohol use	203 (10.0)	1009 (10.0)	0.994
COPD	622 (30.5)	3103 (30.5)	1
Diabetes mellitus	700 (34.3)	3494 (34.3)	1
Hypertension	1546 (75.9)	7724 (75.9)	0.925
Obesity	929 (45.6)	4633 (45.6)	1
Tobacco use	901 (44.2)	4499 (44.2)	0.987

COPD: Chronic obstructive pulmonary disease.

Table 2 Two-year falls and implant-related complications between total hip arthroplasty patients with leg length discrepancy and a matched-control cohort

Complication	Leg length discrepancy (%)	Control (%)	OR	95%CI	P value
Falls	4.37	2.81	1.58	1.24-2.01	< 0.001
DL	6.33	2.53	2.61	2.10-3.24	< 0.001
ML	3.43	0.78	4.54	3.28-6.29	< 0.001
PFx	2.89	1.09	2.70	1.96-3.72	< 0.001

OR: Odds ratio; 95%CI: 95%confidence interval; DL: Dislocation; ML: Mechanical loosening; PFx: Periprosthetic fracture.

Table 3 Medical and healthcare utilization between total hip arthroplasty patients with leg length discrepancy and a matched-control cohort

Utilization	Leg length discrepancy	Control	OR	95%CI	P value
Readmission (%)	7.75	7.02	1.11	0.93-1.33	0.244
Length of stay (day)	3.1 ± 3.4	2.8 ± 2.6			0.034

OR: Odds ratio; 95%CI: 95%confidence interval.

Table 4 Time to revision surgery between total hip arthroplasty patients with leg length discrepancy and a matched-control cohort

Utilization	Leg length discrepancy	Control	P value
Time to revision (day)	225 ± 309	544 ± 758	< 0.001