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Journal of Experimental Orthopaedics

Table 4 Uni- and multi-variable regression analysis of Oxford Hip Score

From: Absence of instabilities and intra-prosthetic dislocations at 7 to 11 years following THA using a fourth-generation cementless dual mobility acetabular cup

Variable

Univariable

Multivariable (n = 163)*

β

95% C.I.

p-value

β

95% C.I.

p-value

Preoperative data

 Age at index operation (yrs)

0.34

(0.16 – 0.51)

< 0.001

0.36

(0.18 – 0.53)

< 0.001

 Body Mass Index (BMI)

−0.12

(−0.35 – 0.12)

0.325

   

 Male sex

−0.49

(−2.64 – 1.66)

0.653

   

Etiology

Primary arthrosis

REF

     

Secondary arthrosis

0.47

(−3.37 – 4.32)

0.808

   

Avascular necorsis

−2.37

(−6.22 – 1.47)

0.225

   

Charnley grade

A

REF

  

REF

  

B

2.56

(−0.93 – 6.05)

0.150

2.95

(− 0.39 – 6.30)

0.083

C

3.28

(0.82 – 5.74)

0.009

3.17

(0.81 – 5.52)

0.009

Intraoperative data

 Stem size

0.25

(−0.41 – 0.91)

0.458

   

 Cup size

0.02

(−0.35 – 0.38)

0.922

   

Stem type

Standard - KA

REF

     

High offset - KHO

−0.46

(−4.44 – 3.52)

0.821

   

Lateralized - KLA

0.25

(−1.93 – 2.43)

0.821

   

Surgical Approach

Posterior

REF

  

REF

  

Watson-Jones

−0.42

(−2.71 – 1.88)

0.721

−1.38

(−3.59 – 0.82)

0.216

  1. *Backward selection (p = 0.15) was used to identify variables to include in the multivariabla analysis
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