Chinese Journal of Tissue Engineering Research ›› 2015, Vol. 19 ›› Issue (44): 7059-7064.doi: 10.3969/j.issn.2095-4344.2015.44.002

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Eccentricity changes affect joint pain and function after total hip arthroplasty

Guo Peng-fei, Zhou Jing-jie, Fan Jing, Li Shu-gang   

  1. Xuzhou Hospital Affiliated to Southeast University School of Medicine, Xuzhou Central Hospital Affiliated to Nanjing University of Chinese Medicine, Department of Rehabilitation Medicine of Xuzhou Central Hospital, Xuzhou 221000, Jiangsu Province, China
  • Received:2015-08-07 Online:2015-10-22 Published:2015-10-22
  • Contact: Li Shu-gang, Associate chief physician, Xuzhou Hospital Affiliated to Southeast University School of Medicine, Xuzhou Central Hospital Affiliated to Nanjing University of Chinese Medicine, Department of Rehabilitation Medicine of Xuzhou Central Hospital, Xuzhou 221000, Jiangsu Province, China
  • About author:Guo Peng-fei, Physician, Xuzhou Hospital Affiliated to Southeast University School of Medicine, Xuzhou Central Hospital Affiliated to Nanjing University of Chinese Medicine, Department of Rehabilitation Medicine of Xuzhou Central Hospital, Xuzhou 221000, Jiangsu Province, China
  • Supported by:

    the National Natural Science Foundation of China, No. 81272151

Abstract:

BACKGROUND: Recovery and reconstruction of femoral eccentricity and hip rotation center after total hip arthroplasty directly affect joint function. However, there is lack of studies on the effects of femoral eccentricity on pain and joint function in patients undergoing total hip arthroplasty.

OBJECTIVE: To explore the effects of femoral eccentricity changes on joint pain and functional recovery after total hip arthroplasty. 
METHODS: Data of 162 cases after total hip arthroplasty were analyzed. Patients were divided into three groups according to the difference of femoral eccentricity on the affected and healthy sides. In the reduction group (30 cases), the difference value was < -5 mm. In the normal group (87 cases), the difference value was -5-5 mm. In the increased group (45 cases), the difference value was > 5 mm. Femoral stem and femoral prosthesis type were compared among different groups. SF-12 scale score, Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC) and Harris score were evaluated and compared before and after replacement. 

RESULTS AND CONCLUSION: Standard eccentricity of femoral prosthesis mainly accounted for 77%, 63% and 73% in the reduction group, normal group and increased group, respectively (P > 0.05). No significant difference in average eccentricity was detected in each group between the affected and healthy sides (P > 0.05). WOMAC score was significantly higher after replacement than that before replacement in three groups (P < 0.05). No significant difference in WOMAC score was found among three groups before replacement (P > 0.05). No significant differences in pain and stiffness were detected among three groups after replacement (P > 0.05), and significant differences in physical function were found (P < 0.05). The physical function was highest in the normal group. No significant difference in SF-12 scale score was seen in the three groups before and after replacement (P > 0.05). The physical ability score was elevated after replacement in the three groups (P < 0.05). Mental scores were significantly elevated in reduction and normal groups (P < 0.05). The excellent and good rate of Harris score was significantly higher in the increased group (96%) than in the reduction group (70%) and normal group (87%) (P < 0.05). These findings indicate that the increased eccentricity contributed to the pain easement after total hip arthroplasty and promoted functional recovery. The decreased eccentricity could worsen patient’s pain, and was not conducive to the restoration of joint function after replacement. 
中国组织工程研究杂志出版内容重点:人工关节;骨植入物;脊柱骨折;内固定;数字化骨科;组织工程

Key words: Arthroplasty, Replacement, Hip, Prosthesis Implantation, Pain Measurement, Tissue Engineering