Diagnosis of trunk injury of brachial plexus by surgeon Location Damage Upper trunk (%) Middle trunk Số lượng (%) Lower trunk (%) Total (180 trun ks of 60 patients) Rupture 15 8, 3 5 2, 8 4 2, 2 24 13, 3 No damage 45 25, 0 55 30, 6 56 31, 1 156 86, 7 Table 3.31.