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Chinese Journal of Geriatric Orthopaedics and Rehabilitation(Electronic Edition) ›› 2025, Vol. 11 ›› Issue (03): 129-138. doi: 10.3877/cma.j.issn.2096-0263.2025.03.001

• Hip Fractures •    

Cause analysis and management strategy of neck shaft angle loss after PFNA internal fixation for unstable elderly intertrochanteric femoral fractures

Chao Zhang1, Yutong Wu1, Zifei Yang1, He Yang1,()   

  1. 1. Department of Orthopaedics,75th Army Hospital of the PLA Joint Logistic Support Force,Dali 671003,China
  • Received:2024-01-25 Online:2025-06-05 Published:2025-06-06
  • Contact: He Yang

Abstract:

Objective

To analyze the causes and management strategies of neck shaft angle loss in elderly patients with unstable intertrochanteric fractures after PFNA internal fixation.

Methods

A total of 126 patients (69 males and 57 females) who received PNFA internal fixation in our hospital from January 2021 to January 2023 were selected. Postoperative dry neck angle loss group (31 cases), no loss group (95 cases).SPSS 23.0 statistical software was used for data statistical analysis,and clinical data,surgical indicators and postoperative recovery of patients were collected. Ordered Logistic regression was used to analyze the relationship between the influencing factors and the loss of neck shaft angle.The effect of Harris score on postoperative loss of neck shaft angle was analyzed by stratified interaction.Differences in factor distribution characteristics were compared by latent class analysis (LCA).

Results

(1) The operative time and hospital stay in the lost group were significantly longer than those in the non-lost group,and the amount of intraoperative blood loss was significantly higher than that in the study group(P<0.001).There were significant differences between the two groups in fracture reduction quality, internal fixation quality, and helical blade placement accuracy(P<0.001).(2)There were significant differences in Harris scores between the two groups at 7 days, 1 month, 3 months, 6 months and 12 months after surgery (P<0.001). (3) Singh index, osteoporosis,thickness of proximal femoral lateral wall,quality of fracture reduction,quality of internal fixation,and accuracy of helical blade placement were all important influencing factors of postoperative neck shaft angle loss(P<0.001).(4)The results of hierarchical interaction test showed that Singh index,osteoporosis,thickness of proximal femoral lateral wall, quality of fracture reduction, quality of internal fixation, and accuracy of helical blade placement were related to the loss of neck shaft angle after operation under different Harris scores before and after adjustment (all P<0.05). Pinteraction test showed that Harris score did not affect the relationship between the above indicators and postoperative neck shaft angle loss. (5) LCA showed that the effects of Singh index, osteoporosis, proximal femoral lateral wall thickness, fracture reduction quality, internal fixation quality,and helical blade placement accuracy on postoperative neck shaft angle loss were heterogeneous.

Conclusion

Singh index,osteoporosis,thickness of proximal femoral lateral wall,quality of fracture reduction, quality of internal fixation and accuracy of helical blade insertion are the key factors affecting the loss of neck shaft angle after PFNA internal fixation for unstable intertrochanteric fractures in the elderly.

Key words: Intertrochanteric fracture of femur, PFNA, Internal fixation, Neck shaft angle

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