In this systematic review and meta-analysis we summarise the normal diffusion tensor imaging (DTI) metrics for roots of the brachial plexus. We included 9 studies describing 316 adults (1:1 male:female) of mean age 35 years (SD 6). The normal fractional anisotropy was 0.36 (95% CI 0.34, 0.38; Figure 4). The normal mean diffusivity was 1.51 x10-3 mm2/s (95% CI 1.45, 1.56; Figure 5). DTI metrics varied according to experimental conditions and participant factors. Our summary estimates from different conditions which may be valuable to researchers and clinicians alike.