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Table 3 Factors affecting implant survival

From: Mid-term results and survival rates following a single-design rotating hinge knee arthroplasty in non-tumor conditions in a Pakistani population

Variable Patients (n = 41) 5-year implant survival in % 95% confidence interval P (log-rank)
Age at surgery
 > 60 22 74% 69–80 n/s
 < 60 19 79% 73–86 n/s
Comorbidities
 Diabetes mellitus (DM) 11 (26.8%) 77% 70–84 n/s
 Hypertension (HTN) 15 (36.5%) 82% 71–87 n/s
 Ischemic heart disease (IHD) 03 (7.31%) 80% 69–83 n/s
 Rheumatoid arthritis (RA) 04 (9.7%) 70% 69–81 n/s
 Asthma 03 (7.31%) 78% 74–81 n/s
 SLE 0 84% 78–87 n/s
 > 2 comorbidities 04 (9.7%) 71% 69–85 n/s
 No comorbidities 01 (2.43%) 70% 69–81 n/s
Charlson comorbidity index (CCI) score
0–2 1 (2.4%) 89% 84–89 n/s
3–5 5 (12.1%) 82% 79–85 n/s
6–8 35 (85.3%) 53% 49–55 Significant
Site of arthroplasty
 Right 18 (43.9%) 71% 69–76 n/s
 Left 22 (53.6%) 77% 73–84 n/s
 Bilateral 01 (2.43%) 81% 77–82 n/s
Body mass index (BMI)
 > 30 17 (41.4%) 79% 77–82 n/s
 < 30 24 (58.5%) 84% 79–86 n/s
ASA score
 Class 2 12 (29.2%) 81% 78–84 n/s
 Class 3 29 (70.7%) 85% 81–87 n/s
Indications for rotating hinge knee (RHK) surgery
 Global instability 11 (26.8%) 87% 82–88 n/s
 Aseptic loosening 25 (60.9%) 70% 69–73 n/s
 PJI 02 (4.87%) 82% 79–81 n/s
 Complex primary 03 (7.31%) 84% 80–88 n/s
  1. ASA American Society of Anesthesiologists, n/s not significant, PJI prosthetic joint infection