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Table 2 Univariate and multivariate cox regression analyses for overall prosthesis survival and for survival of the stem separately. (HR: hazard ratio; ASA: American Society of Anesthesiologists classification)

From: Stem retention and survival in revision of anatomical convertible shoulder arthroplasty to reverse arthroplasty: a Dutch registry study

  Outcome: Prosthesis survival (overall) Outcome: Survival of the stem
Crude HR (95% CI) p-value Adjusted HR (95% CI) p- value Crude HR (95% CI) p-value Adjusted HR (95% CI) p-value
Convertible stem
No 1   1   1   1  
Yes 1.6 (1.2–2.3) < 0.01 1.4 (0.9–2) 0.1 1 (0.6–1.6) 0.9 0.8 (0.5–1.5) 0.5
Age 0.97 (0.95–0.98) < 0.01 0.97 (0.95–0.99) < 0.01 0.97 (0.95–0.99) < 0.01 0.99 (0.96–1.01) 0.2
BMI 1 (0.97–1.03) 0.9    1 (0.96–1.04) 0.97   
Sex
Male 1     1    
Female 0.9 (0.6–1.3) 0.5    0.7 (0.4–1.1) 0.1   
Smoking
No 1   1   1    
Yes 1.6 (1–2.4) 0.04 1 (0.6–1.6) 0.9 1.6 (0.9–2.9) 0.1   
ASA
I 1     1    
II 1 (0.6–1.6) 0.8    0.9 (0.5–1.8) 0.8   
III-IV 1 (0.6–1.8) 1    0.6 (0.3–1.5) 0.3   
Walch classification
A1/A2 1   1   1    
B1 0.4 (0.2–0.9) 0.02 0.6 (0.3–1.2) 0.2 0.6 (0.2–1.5) 0.3   
B2/B3 0.7 (0.3–1.6) 0.4 0.7 (0.3–2) 0.5 0.9 (0.3–2.7) 0.8   
Year
2014 1     1    
2015 0.9 (0.6–1.3) 0.5    0.8 (0.5–1.4) 0.5   
2016 1.1 (0.7–1.7) 0.6    1.1 (0.6–2) 0.8   
Side
Left 1     1    
Right 0.8 (0.6–1.1) 0.2    0.7 (0.4–1.1) 0.7   
Diagnosis
Osteoarthritis 1   1   1   1  
Fracture 2.9 (2.0–4.1) < 0.01 1.8 (1.1–2.8) 0.01 2.1 (1.3–3.5) 0.02 1.5 (0.9–2.7) 0.1
Cuff arthropathy 0.9 (0.3–2.9) 0.9 1.3 (0.4–4.1) 0.7 0.5 (0.07–3.7) 0.5 0.7 (0.1–5.5 0.8
Other 2.4 (0.6–9.7) 0.2 1.7 (0.4–7.0) 0.5 2 (0.3–14.4) 0.5 1.6 (0.2–11.8) 0.6
Approach
Deltopectoral 1     1    
Anterosuperior 0.9 (0.5–1.6) 0.7    0.8 (0.3–1.9) 0.6   
Prosthesis
Total shoulder prosthesis 1   1   1   1  
Hemi shoulder prosthesis 2.5 (1.8–3.5) < 0.01 2 (1.3–3.1) < 0.01 2.2 (1.4–3.6) < 0.01 2 (1.2–3.4) 0.01
Fixation
Uncemented 1     1    
Cemented 1.1 (0.8–1.6) 0.5    0.8 (0.5–1.4) 0.5   
Previous surgery
No 1   1   1   1  
Yes 2.7 (1.8–4) < 0.01 1.9 (1.2–3) < 0.01 4.3 (2.6–7.1) < 0.01 3.9 (2.3–6.6) < 0.01