Objective To investigate the application value of cannulated screws in the treatment of Hauck type Ⅱ ulnar styloid process fracture.Methods The clinical data of 93 patients with Hauck type Ⅱ ulnar styloid process fracture who received treatment at Fuzhou Second Hospital Affiliated to Xiamen University from December 2020 to February 2023 were retrospectively analyzed for a case-control study.Among these patients,38 patients did not undergo surgical fixation and 55 patients underwent surgical fixation.Twenty-seven patients underwent surgical fixation with cannulated screws and twenty-eight patients underwent surgical fixation with Kirschner wires.The fracture healing,postoperative rehabilitation,and functional recovery of the wrist were compared among groups.Results The fracture healing rate and the incidence of distal radioulnar joint instability in the surgical fixation group were 100.00％(55/55)and 5.45％(3/55),respectively.These were significantly higher and lower respectively compared with the non-surgical fixation group[57.89％(22/38),50.00％(19/38),x2=27.66,24.69,both P＜0.001].The wrist function recovery in the surgical fixation group was significantly superior to that in the non-surgical fixation group(Z=-5.18,P＜0.001).There were no statistically significant differences in operative time and intraoperative blood loss between the cannulated screw group and the Kirschner wire group[(21.41±5.15)minutes vs.(20.93±5.71)minutes,(2.11±0.97)mL vs.(2.07±0.90)mL,t=0.32,0.15,both P＞0.05].The fracture healing time and rehabilitation intervention time in the cannulated screw group were shorter than those in the Kirschner wire group[(6.48±1.05)weeks vs.(9.14±1.24)weeks,(2.11±0.32)weeks vs.(3.11±0.57)weeks,t=8.57,7.98,both P＜0.001].The postoperative wrist function scores in the cannulated screw group were superior to those in the Kirschner wire group(Z=-2.21,P＜0.05).Conclusion For patients with Hauck type Ⅱ ulnar styloid process fracture,surgical fixation can promote the recovery of wrist function after surgery,and cannulated screw fixation is an effective method for the treatment of Hauck type Ⅱ ulnar styloid process fracture.
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