[Comparison of curative effect between F-shaped hollow screw and traditional three parallel screws in the treatment of Pauwels type Ⅲ femoral neck fracture]

Objective: To analyze and compare the clinical efficacy of F-shaped hollow screw and traditional inverted triangle three parallel screws in the treatment of young and middle-aged Pauwels type Ⅲ femoral neck fracture.

Methods: From January 2017 to January 2020, 38 patients with Pauwels type Ⅲ femoral neck fracture were treated. They were divided into two groups according to different screw placement methods. Among them, 18 patients in group A were fixed with F-shaped hollow screw, including 12 males and 6 females, aged 37 to 55 years, the time from injury to operation was 1 to 3 days. Other 20 cases in group B were fixed with 3 parallel screws in traditional inverted triangle, including 12 males and 8 females, aged 35 to 55 years. The time from injury to operation was 1 to 3 days. The fracture nonunion, femoral head necrosis, femoral neck shortening, hollow screw withdrawal, hip function Harris score and visual analogue scale(VAS) of pain were compared between the two groups.

Results: All patients were followed up for 15 to 31 months. There was no significant difference in fracture nonunion, femoral neck shortening and femoral head necrosis between two groups(P>0.05). There was significant difference in screw withdrawal between two groups(P<0.05). There was no significant difference in hip Harris score and VAS between the two groups at 12 months after operation(P>0.05).

Conclusion: The short-term and medium-term effects of F-shaped and traditional inverted triangle three parallel screws in the treatment of young and middle-aged Pauwels Ⅲ femoral neck fractures are similar, but the nail withdrawal rate of F-shaped hollow screw is low.