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Table 1 Selected characteristics of the study participants who underwent primary unilateral total knee arthroplasty (n = 138)

From: Determinants of pain, functional limitations and health-related quality of life six months after total knee arthroplasty: results from a prospective cohort study

Variables

n (%)

Mean (SD)

Variables

n (%)

Mean (SD)

Demographics

  

Clinical characteristics

  

 Age (years)

 

67 (9.3)

 Diagnosis

  
   

  Osteoarthritis

133 (96)

 

 Gender

  

  Rheumatoid arthritis

5 (4)

 

  Female

91 (66)

 

 BMI (kg/m2)

 

31.2 (6.2)

 Marital status

  

 Comorbidities ( /56)

 

6.5 (2.2)

  Single, separated, divorced or widowed

51 (37)

 

 Duration of knee symptoms before enrolment (years) § (years)

 

8.2 (8.3)

  Married or common law

87 (63)

 

 Contralateral knee pain

100 (72)

 
   

 Use of a walking aid before surgery

52 (38)

 

 Living alone

33 (24)

 

Surgical characteristics

  
   

 Implant type

  

Socioeconomic characteristics

  

  Postero-stabilized

108 (78)

 

 Educational level (part or complete)

  

  Cruciate retaining

30 (22)

 

  High school or less

77 (56)

 

 Implant fixation

  

  College or university

61 (44)

 

  Cementless

4 (3)

 

 Employment status

  

  Hybrid

2 (1)

 

  Unemployed or retired

108 (78)

 

  Cemented

132 (96)

 

  Employed

30 (22)

 

 Implant bearing type

  

 Household income *

  

  Mobile

4 (3)

 

  < $30 000 / year

48 (35)

 

  Fixed

134 (97)

 

  $30 000 - $59 999/ year

42 (30)

 

 Patella resurfacing

129 (93)

 

  ≥ $60 000/ year

32 (23)

 

 Number of in-hospital complications

  
   

  0

103 (77)

 

Psychosocial characteristics

  

  1

34 (24)

 

 Psychological distress (/42)

 

7.1 (6.3)

  ≥2

9 (7)

 

 Social support

  

Health services utilization

  

  Low

66 (48)

 

 Hospital length of stay (days)

 

7.1 (2.9)

  High

72 (52)

 

 Discharged directly home

120 (87)

 
   

 Post-surgery community physiotherapy(hours)

 

14.7 (18.3)

  1. *n = 125 – CND $.
  2. Social support was dichotomized around the median score: Low (≤ 80) and High (>80).
  3. Body mass index.
  4. § n = 132.
  5. WOMAC pain score at enrolment on pre-surgery wait list dichotomized into presence or absence of contralateral knee pain.
  6. In-hospital complications: wound infection (n = 5), implant infection (n = 4), fracture or dislocation (n = 3), knee ankylosis and manipulation (n = 4), cardiovascular/pulmonary/ circulatory complications (n = 12), peripheral/central nervous system involvement (n = 9), urinary infection (n = 3), acute confusion (n = 1), tendon and ligament rupture (n = 1) or blood transfusion (n = 14).