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Table 1 Descriptive statistics of demographics

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

Variables Number (n = 41)
Age (years) 66.4 (range 51–74)
Sex
 Male 12 (29.2%)
 Female 29 (70.7%)
Site of arthroplasty
 Right 18 (43.9%)
 Left 22 (53.6%)
 Bilateral 1 (2.43%)
Body mass index (BMI) 29.2 (range 20.2–50.2)
Comorbidities
 Diabetes mellitus (DM) 11 (26.8%)
 Hypertension (HTN) 15 (36.5%)
 Ischemic heart disease (IHD) 3 (7.31%)
 Rheumatoid arthritis (RA) 4 (9.7%)
 Asthma 3 (7.31%)
 SLE
 > 2 comorbidities 4 (9.7%)
 No comorbidities 1 (2.43%)
Indications for the rotating hinge knee (RHK)
A. Revision total knee arthroplasty
  Aseptic loosening of primary knee implant 25 (60.9%)
  Prosthetic joint infection after primary TKA 2 (4.87%)
  Global instability following primary TKA 11 (26.8%)
B. Complex primary knees with bone loss
  Varus deformity (> 30°) 1 (2.43%)
  Valgus deformity (> 30°) 1 (2.43%)
  Fixed flexion deformity (> 30°) 1 (2.43%)
  Recurvatum deformity (> 10°)
  Deformity in > 1 plane
AORI classification for bone loss
 T1 4 (9.75%)
 T2a 27 (65.8%)
 T2b 1 (2.43%)
 T3 2 (4.87%)
 F1 3 (7.31%)
 F2a 2 (4.87%)
 F2b 1 (2.43%)
 F3 1 (2.43%)
  1. AORI Anderson Orthopedic Research Institute Classification System, T tibia, F femur, SLE systemic lupus erythematosus, TKA total knee arthroplasty