We retrospectively analyzed CT scans of 620 individuals, who presented to our traumatology department between 2008 and 2010. Facet joint (FJ) arthritis was present in 308 (49.7%) individuals with a mean grade of 1. It was seen in 27% of individuals <= 40 years and in 75% of individuals >= 41 years (P < 0.0001) as well as in 52% of females and 49% of males (P = 0.61). Mean FJ orientation was 30.4 degrees at L2/3, 38.7 degrees at L3/4, 47 degrees at L4/5, and 47.3 degrees at L5/S1. FJ arthritis was significantly associated with more coronal (increased degree) FJ orientation at L2/3 (P = 0.03) with a cutoff point at >= 32 degrees. FJs were more coronally oriented (48.8 degrees) in individuals <= 40 years and more sagittally oriented (45.6 degrees) in individuals >= 41 years at L5/S1 (P = 0.01). Mean FJ asymmetry was 4.89 degrees at L2/3, 6.01 degrees at L3/4, 6.67 degrees at L4/5, and 7.27 degrees at L5/S1, without a significant difference for FJ arthritis. FJ arthritis is common, increases with age, and affects both genders equally. More coronally oriented FJs (>= 32 degrees) in the upper lumbar spine may be an individual risk factor for development of FJ arthritis.