[Is anterior transposition of ulnar nerve beneficial during open reduction and internal fixation for intercondylar humerus fractures].

Objective: To compare activity, function and postoperative ulnar nerve function of elbow joint by anterior transposition of ulnar nerve or not during open reduction and internal fixation for intercondylar humerus fractures.

Methods: From January 2013 to May 2017, 168 patients with intercondylar humerus fractures were treated surgically with open reduction and internal fixation (ORIF). The patients were divided into anterior subcutaneous transposition group and simple decompression group according to handling method of ulnar nerve. There were 48 patients in transposition group, including 23 males and 25 females with an average age of (42.5±15.7) years old ranging from 14 to 77 years old, and ulnar nerve treated enough free and anterior subcutaneous transpostion after reduction of intercondylar humerus fractures; while there were 120 patients in simple decompression group, including 62 males and 58 females with an average age of (43.4±17.3) years old ranging from 14 to 81 years old, ulnar nerve returned to sulci nervi ulnaris. Activity of flexion and extension of elbow joint, range of rotation of forearm were recorded at the latest following-up, Mayo score of elbow joint was used to evaluate clinical effect, McGowan grading was used to assess dysfunction of unlnar nerve.

Results: There was 1 patient delayed union, and 2 patients occurred joint stiffness in transposition group; while 1 patient suffered from incision infection, 1 fracture nonunion, and 4 joint stiffness in simple decompression group; and there was no statistical difference between two groups(>0.05). Forty-eight patients in transposition group were followed-up from 12 to 59 months with an average of (32.2±14.2) months, activity of flexion and extension of elbow joint was (116±28)°, range of rotation of forearm was (152±12)°, MEPS score was 88.6±11.6; and 28 patients got excellent results, 16 good, 3 moderate and 1 poor. There were 17 patients occurred injury of ulnar nerve, and 7 patients still occurred dysfunction of ulnar nerve, and 6 patients were grade I, 1 patient was grade II according to McGowan grading. In simple decompression group, there were 120 patients were followed-up from 13 to 61 months with an average of (32.0±14.9) months, activity of flexion and extension of elbow joint was (119±27)°, range of rotation of forearm was (154±16)°, MEPS score was 88.9±12.5; and 67 patients got excellent results, 44 good, 7 moderate and 2 poor. There were 42 patients occurred injury of ulnar nerve, and 22 patients still occurred dysfunction of ulnar nerve, and 18 patients were grade I, 4 patients were grade II according to McGowan grading. There were no statistical differences in following time, activity of flexion and extension of elbow joint, range of rotation of forearm, MEPS score and dysfunction of ulnar nerve.

Conclusions: Whether anterior transposition of ulnar nerve or not has no clarified effects for open reduction and internal fixation for intercondylar humerus fractures.