Chinese Journal of Tissue Engineering Research ›› 2013, Vol. 17 ›› Issue (30): 5427-5433.doi: 10.3969/j.issn.2095-4344.2013.30.002

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Femoral head diameter and acetabular anteversion in hip prosthesis replacement

Zhang Jiang-tao1, Shang Yan-chun1, Wu Fu-yuan2, Qu Guang-yun2   

  1. 1Department of Knee Injury, Luoyang Orthopedic Traumatological Hospital, Luoyang  471002, Henan Province, China
    2Department of Orthopaedics and Traumatology, Queen Mary University of Hong Kong Hospital, Hong Kong Special Administrative Region, China
  • Received:2013-04-23 Revised:2013-05-04 Online:2013-07-23 Published:2013-07-23
  • About author:Zhang Jiang-tao★, Master, Attending physician, Department of Knee Injury, Luoyang Orthopedic Traumatological Hospital, Luoyang 471002, Henan Province, China zjtzjt803@163.com

Abstract:

BACKGROUND: Posterior dislocation after total hip replacement is one of the most common complications that second only to loosen, and can affect the stability of the hip joint seriously. There is controversy on the effect of femoral head diameter and acetabular anteversion on the stability of hip joint in clinical study.
OBJECTIVE: To investigate the effect of the femoral head diameter and acetabular anteversion on the stability of hip joint after hip prosthesis replacement.
METHODS: The femoral head diameter and acetabular anteversion that affect the posterior instability after hip prosthesis replacement were measured on the cadaveric bone. The acetabular shell was inserted at 0°-20° of anteversion at five degree intervals. The femoral heads with different diameters (28, 32 and 36 mm) were used for experiment, the internal rotation degrees to dislocation caused by hip at 90° flexion and 0° adduction and at 90° flexion and 30° adduction were recorded.
RESULTS AND CONCLUSION: When the cup anteversion varied from 0° to 15°, there was an increase in the degree of internal rotation angle that could cause hip dislocation with the increasing of femoral head diameter (P < 0.05). When the cup anteversion varied from 15° to 20°, the increasing trend was not significant. With the hip at 90° flexion and 0° adduction, and the cup anteversion varied from 15° to 20°, the stability of 36 mm group was significantly higher than that of the 28 mm and 32 mm groups (P < 0.01); the stability of 32 mm group was higher than that of 28 mm group when the acetabular anteversion in 10° or more (P < 0.05); there was no significant difference in stability between groups when the anteversion less than 10°. With the hip at 90° flexion and 30° adduction, the stability of 36 mm group was significantly higher than that of the 28 mm and 32 mm groups (P < 0.01); the stability of 32 mm group was higher than that of 28 mm group when the acetabular anteversion in 10° or more (P < 0.05); there was no significant difference in stability between groups when the anteversion less than 10°. The results indicate that the increasing of acetabular anteversion can reduce the occurrence of dip dislocation, but when it is difficult to choice the acetabular anteversion, large-diameter femoral head is preferred to increase the stability of hip joint. 

Key words: bone and joint implants, artificial prosthesis, computer assisted orthopedic surgery, navigation system, total hip arthroplasty, dislocation, diameter of femoral head, acetabular anteversion, head-to-neck ratio

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