Bone mineral density assessment by DXA in rheumatic patients with end-stage osteoarthritis undergoing total joint arthroplasty

Table 2 Predictors for DXA parameters in the THA and TKA cohort using a multivariate regression model

	Operated side			Contralateral non-operated side			Lumbar spine
	β	T	p	β	T	p	β	T	p
THA patients
(Intercept)		- 4.226	0.001		- 2.243	0.046		- 2.415	0.028
Age	0.017	0.100	0.922	- 0.262	- 1.542	0.151	0.194	0.948	0.357
Sex	0.132	0.764	0.455	0.170	0.984	0.346	0.412	1.969	0.066
BMI	0.667	3.807	0.001	0.665	3.459	0.005	0.385	1.857	0.082
KL score	0.253	1.489	0.155	0.176	1.014	0.332	- 0.032	- 0.162	0.873
Prednisolone dose	- 0.177	- 1.974	0.298	- 0.439	- 2.538	0.028	0.088	0.440	0.666
R² adjusted	0.446**			0.585**			0.265
TKA patients
(Intercept)		0.954	0.356		0.289	0.776		- 0.112	0.912
Age	- 0.266	- 1.342	0.201	- 0.179	- 0.844	0.411	- 0.259	- 1.176	0.256
Sex	- 0.126	- 0.606	0.554	- 0.237	- 1.097	0.289	- 0.075	- 0.347	0.733
BMI	0.252	1.284	0.220	0.306	1.478	0.159	0.421	1.955	0.067
KL score	- 0.597	- 3.093	0.008	- 0.467	- 2.351	0.032	- 0.250	- 1.196	0.248
Prednisolone dose	- 0.011	- 0.051	0.960	- 0.213	- 1.062	0.304	- 0.311	- 1.488	0.155
R² adjusted	0.342*			0.223			0.098

Bold indicates significant independent predictors (p < 0.05). Asterisks indicate significance in the overall ANOVA multiple regression prediction model (*p < 0.05,**p < 0.01). BMI Body mass index, KL Kellgren-Lawrence

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