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Table 1 Preoperative demographics between elderly patients (aged ≥75 years) and nonelderly patients (aged < 75 years)

From: Intraoperative rotational kinematics and its influence on postoperative clinical outcomes differ according to age in Unicompartmental knee Arthroplasty

  Elderly Non-elderly P value
Number of knees 48 63  
Gender (female/male) 29/19 46/17 0.219
Diagnosis (OA/ON) 42/6 49/14 0.220
Age (years) 79.3 (3.1) 66.6 (5.6) < 0.001*
Body mass index (kg/m2) 24.3 (3.4) 25.8 (4.1) 0.028*
Maximum extension (°) 4.6 (3.4) 3.5 (4.3) 0.159
Maximum flexion (°) 131.0 (6.8) 131.4 (6.7) 0.963
Knee society functional score 54.1 (13.3) 58.2 (14.7) 0.135
Femorotibial angle (°) in X-ray 182.9 (3.8) 182.3 (4.3) 0.426
KOOS (knees) 40 52  
 Pain 52.2 (15.1) 47.8 (15.5) 0.185
 Symptom 59.6 (19.4) 57.9 (17.8) 0.666
 ADL 60.0 (13.0) 59.4 (16.4) 0.837
 Sports 22.7 (17.4) 22.6 (17.9) 0.981
 QOL 27.1(15.6) 29.5 (15.8) 0.477
  1. Data presented as Average (Standard deviation)
  2. *statistically significant (p < 0.05)
  3. OA osteoarthritis, ON osteonecrosis, KOOS knee injury and osteoarthritis outcome score, ADL activities of daily living, QOL quality of life