Table V.

Multinomial logistic regression: predictors of Unified Classification System (UCS) subtypes compared to UCS B.

Subtype	RRR (95% CI)	p-value
UCS A
Type of femoral stem
Cemented (reference)	1
Cementless	3.3 (1.9 to 5.7)	< 0.001
Mobility prior to PPF
Independent	Reference
Uses stick	3 (1.4 to 6.4)	0.004
Uses frame/walker	2.7 (1.1 to 6.6)	0.034
Wheelchair user	7.5 (1.3 to 41.8)	0.022
Dementia	2.8 (1.03 to 7.6)	0.043
Mechanism of injury
Fall < 2 m	Reference
MVC	9.1 (1.3 to 65.3)	0.028
UCS C
Type of femoral stem cementing
Cemented	Reference
Cementless	0.36 (0.2 to 0.7)	0.002
Mobility prior to PPF
Independent	Reference
Uses stick	2 (1.1 to 4.4)	0.036
Uses frame/walker	3 (1.4 to 6.5)	0.005
Wheelchair-bound	11.7 (2.4 to 57.9)	0.002
Diabetes	0.3 (0.2 to 0.7)	0.008
Implant around PPF
THA	Reference
Hip hemiarthroplasty	0.5 (0.2 to 0.95)	0.037
UCS D
Type of femoral stem cementing
Cemented	Reference
Cementless	0.3 (0.08 to 0.89)	0.032
Sex
Female	1
Male	0.2 (0.1 to 0.7)	0.011
Mobility prior to PPF
Independent	Reference
Uses stick	6.3 (1.4 to 27.6)	0.015
Prior PPF in the past	13 (2.4 to 71.7)	0.003
Parkinson’s disease	9.8 (1.4 to 70.1)	0.023
Dementia	7.4 (1.2 to 47.4)	0.035
Rheumatoid disease	5.6 (1.4 to 22.6)	0.016
Metastatic cancer	16 (2.6 to 97.4)	0.003
Mechanism of injury		0.002
Fall < 2 m	Reference
Fall > 2 m	12.5 (2.6 to 60.1)

CI, confidence interval; PPF, periprosthetic fracture; RRR, relative risk ratio; THA, total hip arthroplasty; UCS, Unified Classification System.