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Official Journal of the Italian Society of Orthopaedics and Traumatology

Table 3 Comparisons between the group of typical patients with all selection criteria satisfied and the groups of patients who did not satisfy one of the selection criteria

From: Key factors in determining surgical timing of total knee arthroplasty in osteoarthritic patients: age, radiographic severity, and symptomatic severity

Parameters Typical candidatesa
[N = 190 (49.6%)]
Patients not satisfying the age criterion
[N = 20 (5.2%)]
Patients not satisfying the radiographic criterion
[N = 53 (13.8%)]
Patients not satisfying the symptomatic criterion
[N = 77 (20.1%)]
Mean (SD) Mean (SD) Significanceb
(P-value)
Mean (SD) Significanceb
(P-value)
Mean (SD) Significanceb
(P-value)
Age 70.3 (4.8) 56.9 (1.5) <0.001 69.6 (4.9) 0.419 69.5 (5.7) 0.365
Radiographic OA score 6.1 (1.5) 5.7 (1.1) 0.609 3.5 (0.5) <0.001 6.0 (1.3) 0.598
Preoperative WOMAC
 Pain (20) 13.3 (3.2) 12.7 (3.4) 0.385 13.8 (3.3) 0.364 7.2 (2.7) <0.001
 Function (68) 48.3 (8.5) 41.1 (6.8) 0.002 46.6 (10.4) 0.352 27.4 (5.5) <0.001
Postoperative WOMAC
 Pain (20) 2.6 (3.1) 1.4 (2.6) 0.101 2.4 (2.7) 0.803 1.6 (2.2) 0.023
 Function (68) 17.3 (10.0) 10.8 (10.1) 0.015 18.2 (11.5) 0.634 13.3 (9.3) 0.016
Proportion dissatisfiedc 8.7% (14/161) 0% (0/16) NA 8.9% (4/45) 0.968 3.0% (2/66) 0.130
  1. SD Standard deviation, OA osteoarthritis, WOMAC Western Ontario and McMaster Universities Osteoarthritis Index, NA not applicable
  2. aTypical patients satisfied all three selection criteria: (1) age ≥61 years, (2) radiographic OA score ≥4.5, (3) preoperative WOMAC total score ≤50% of full mark
  3. bComparisons were made to the group of typical candidates
  4. cNot all patients responded to this question. Therefore, calculation of the proportions and comparisons between the groups were done with the numbers of patients who responded to the question