Occupational kneeling and radiographic tibiofemoral and patellofemoral osteoarthritis

Table 2 Characteristics of study participants; floor layers (n = 134) and graphic designers (n = 120)

	Floor layers		Graphic designers
Age (years) mean, range	52.6	39–68	57.9	40–70
Trade seniority* (years) mean, range	29.2	3–49	35.6	8–54
BMI^† (kg/m²) mean, range	26.4	20–41	26.0	17–42
Knee-straining sports ^‡ n, (%)	71	(53)	80	(67)
Knee osteoarthritis ^§ n, (%)
*Grade 1*
- Tibiofemoral	10	(8)	2	(2)
- Patellofemoral	5	(4)	8	(7)
*Grade 2–3*
- Tibiofemoral	7	(5)	7	(6)
- Patellofemoral	4	(3)	8	(8)
*Grade 4–6*
- Tibiofemoral	5	(4)	6	(5)
- Patellofemoral	3	(2)	5	(4)

* Years of employment in the trade
^† Body mass index
^‡ Defined as football, handball, badminton, tennis, volleyball, ice hockey, and weight lifting
^§ Combined tibiofemoral and patellofemoral osteoarthritis; floor layers n = 3, graphic designers n = 6

ISSN: 1745-6673