Table 2 Factors associated with serum cobalt and chromium levels

Age

− 0.04

(− 0.08–0.006)

0.094

− 0.02

(− 0.03–− 0.005)

0.009

Weight

0.02

(− 0.01–0.05)

0.26

0.01

(0.002–0.02)

0.017

BMI

0.03

(− 0.07–0.12)

0.59

0.03

(− 0.003–0.06)

0.079

Sex

Male (n = 6)

REF

REF

Female (n = 31)

− 0.22

(− 0.74–0.3)

0.39

− 0.14

(− 0.3–0.04)

0.13

Stem offset

Standard (n = 3)

REF

REF

High offset (n = 34)

− 0.4

(− 1.1–0.3)

0.21

0.04

(− 0.2–0.3)

0.73

Head diameter

28 mm (n = 5)

− 0.4

(− 0.9–0.2)

0.19

− 0.12

(− 0.3–0.09)

0.25

32 mm (n = 32)

REF

REF

Head offset

0 mm (n = 17)

0.5

(− 0.1–1.1)

0.097

0.2

(− 0.04–0.4)

0.11

3 mm (n = 17)

− 0.05

(− 0.7–0.6)

0.21

0.07

(− 0.15–0.29)

0.51

6 mm (n = 3)

REF

REF

Postoperative JOA score

Pain

0.005

(− 0.1–0.1)

0.92

− 0.014

(− 0.05–0.03)

0.47

Walk

0.17

(0.01–0.3)

0.0358

0.07

(0.009–0.12)

0.024

ROM

0.009

(− 0.2–0.2)

0.93

0.01

(− 0.07–0.09)

0.8

ADL

0.08

(− 0.08–0.2)

0.34

0.04

(− 0.02–0.09)

0.17

HOOS score

Symptoms

− 0.08

(− 0.2–0.05)

0.22

− 0.06

(− 0.1–− 0.009)

0.019

Pain

− 0.009

(− 0.06–0.05)

0.76

− 0.015

(− 0.04–0.005)

0.14

Function in daily life

− 0.006

(− 0.03–0.02)

0.67

− 0.008

(− 0.02–0.002)

0.1

Function in sport and recreation

− 0.06

(− 0.2–0.04)

0.23

− 0.03

(− 0.07–0.001)

0.056

Hip-related QOL

0.03

(− 0.09–0.14)

0.62

− 0.012

(− 0.05–0.03)

0.55

Femoral offset

0.02

(− 0.05–0.08)

0.6

0.008

(− 0.014–0.03)

0.47

Acetabular offset

0.05

(− 0.08–0.18)

0.48

0.025

(− 0.02–0.07)

0.3

Cup anteversion

− 0.04

(− 0.1–0.02)

0.19

− 0.014

(− 0.04–0.01)

0.24

Cup inclination

0.03

(− 0.04–0.1)

0.33

0.02

(− 0.006–0.05)

0.12

Coronal stem alignment

0.02

(− 0.2–0.2)

0.88

0.004

(− 0.07–0.08)

0.9