Chinese Journal of Tissue Engineering Research ›› 2019, Vol. 23 ›› Issue (36): 5788-5793.doi: 10.3969/j.issn.2095-4344.1958

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Design and biomechanical analysis of hollow titanium rod supporting the femoral head to prevent collapse

Hu Changbo, Yang Xinming, Zhang Ying
  

  1. Department of Orthopedics, First Affiliated Hospital of Hebei North University, Zhangjiakou 075000, Hebei Province, China
  • Online:2019-12-28 Published:2019-12-28
  • Contact: Yang Xinming, Master, Chief physician, Professor, Department of Orthopedics, First Affiliated Hospital of Hebei North University, Zhangjiakou 075000, Hebei Province, China
  • About author:Hu Changbo, Master, Attending physician, Department of Orthopedics, First Affiliated Hospital of Hebei North University, Zhangjiakou 075000, Hebei Province, China Yang Xinming, Master, Chief physician, Professor, Department of Orthopedics, First Affiliated Hospital of Hebei North University, Zhangjiakou 075000, Hebei Province, China Both Hu Changbo and Yang Xinming contributed equally to this paper.
  • Supported by:

    the Hebei Province Health Commission 2019 Medical Research Project, No. 20190882 (to HCB)| the Zhangjiakou City Science and Technology Research and Development Planning Program in 2007, No. 0711045D-5 (to YXM)

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Abstract:

BACKGROUND: Among many methods for the treatment of early femoral head necrosis, the clinical application of hollow titanium rod has been recognized by many scholars. However, the in vitro biomechanical analysis of hollow titanium rod supporting the lesion area of the femoral head to prevent its collapse has not been reported.
OBJECTIVE: To design the hollow titanium rod preventing the collapse of the femoral head and investigate its biomechanical feasibility, providing a theoretical basis for clinical application.  
METHODS: Fifteen normal adult femoral specimens were randomly divided into three groups (5 specimens in each group): normal group (group A), core decompression group (group B), core decompression + hollow titanium rod placement group (group C). When the specimen was placed in a biomechanical machine, pressure was applied to the top of the femoral head and gradually increased until the femoral head collapsed. The strain value of femoral trochanteric fossa (a), femoral moment (b), and femoral greater trochanter (c) was measured. The maximum load (failure limit point load) was recorded when the femoral head collapsed and statistical data were compared among a, b and c.
RESULTS AND CONCLUSION: (1) When the load of group A reached 300 N, there was no statistically significant difference in the strain values among a, b and c (P > 0.05). When the load of group B reached 300 N, there was no significant difference in strain values between a and b (P > 0.05). However, the strain value at c was significantly greater than that at a and b (P < 0.05). The strain value at a and b in Group A was significantly greater than that in group B, and the train value at c in group A was significantly lower than that in group B (P < 0.05). (2) There was no significant difference in strain value at a, b and c in group C (P > 0.05). The strain value at a and b in group C was significantly greater than that in group B, and the train value at c in group C was significantly lower than that in group B (P < 0.05). There were no significant differences in the strain values at a, b and c between group A and group C (P > 0.05). (3) The load at the failure limit point of the femoral head caused by compression was different among three groups. The load at the failure limit point of group B was significantly lower than that in group A and group C (P < 0.05). There was no significant difference in load at the failure limit point between group A and group C (P > 0.05). (4) These results suggest that hollow titanium rod used to support the femoral head has many design advantages and meets the humanized needs of clinical patients. Hollow titanium rod placement can effectively change the stress distribution of the femoral head under load after decompression of the core, so that the biomechanical properties are close to the normal distribution and have a good supporting effect, which can effectively prevent femoral head collapse and provide a biomechanical basis for the clinical application of hollow titanium rod in the treatment of early osteonecrosis of the femoral head.

Key words: femoral head, hollow titanium rob, design, femoral head collapse, strain, load at the failure limit point, biomechanics

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