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Table 1 Baseline demographic and clinical characteristics

From: Influence of extension stem length and diameter on clinical and radiographic outcomes of revision total knee arthroplasty

CharacteristicLoosening (n = 17)No loosening (n = 48)p
Age, years69.22 (52–79)71.94 (56–86)0.553
Female sex47.06 (8)81.25 (39)0.007*
BMI27.99 (21.77–41.09)28.35 (21.35–37.76)0.748
ASA score ≥ 352.94 (9)50.00 (24)0.828
CCI
 1–229.41 (5)29.17 (14)0.413
 3–470.59 (12)56.25 (27) 
  ≥ 5014.58 (7) 
Bone quality
 Femur (loosening, n = 12)
  good0 (0)5.66 (3)0.498
  fair66.67 (8)73.58 (39) 
  poor33.33 (4)20.75 (11) 
Tibia (loosening, n = 12)
 good8.33 (1)1.89 (1)0.437
 fair50.00 (6)62.26 (33) 
 poor41.67 (5)35.85 (19) 
Bone defect severity
 Femur (loosening, n = 12)
  I25.00 (3)52.83 (28)0.113
  IIa75.00 (9)47.17 (25) 
Tibia (loosening, n = 12)
 I8.33 (1)49.06 (26)0.010*
 IIa91.67 (11)50.94 (27) 
Prosthesis before revision
 Primary TKA82.35 (14)89.58 (43)0.092
 UKA0 (0)6.25 (3) 
 Revision TKA17.65 (3)2.08 (1) 
 None0 (0)2.08 (1) 
Follow-up, months80.11 (33.15–137.53)67.73 (24.02–131.58)0.091
  1. Data are shown as frequency (number) or mean (range) unless otherwise specified. Bone defect severity was assessed using the Anderson Orthopaedic Research Institute classification. ASA American Society of Anesthesiologists; BMI body mass index; CCI Charlson comorbidity index; TKA total knee arthroplasty; UKA uni-compartment knee arthroplasty; *: p < 0.05