Table 1 Demographics of 394 knees (311 patients)

Men: % (number of knees)

20.0% (79 knees)

Age at surgery (years)

72.9 ± 8.2

Age at survey completion (years)

75.2 ± 8.2

Follow-up (months)

28.0 ± 25.2

BMI at survey completion (kg/m²)

25.5 ± 4.3

Diagnosis: % (number of knees)

OA: 86.0% (339)

ON: 7.4% (29)

RA: 6.6% (26)

Preoperative K-L grade of 339 knees diagnosed OA:

% (number of knees)

Grade 1: 0.3% (1)

Grade 2: 5.6% (19)

Grade 3: 18.9% (64)

Grade 4: 75.2% (255)

Surgical method: % (number of knees)

TKA: 81.2% (320)

UKA: 18.8% (74)

Skin incision: % (number of knees)

Midline: 51.5% (203)

Anteromedial: 48.5% (191)

Arthrotomy: % (number of knees)

Medial parapatellar: 25.4% (100)

Trivector: 3.5% (14)

Midvastus: 22.6% (89)

Subvastus: 48.5% (191)