Stability of the acetabular cup in different positions to repair acetabular dysplasia

doi:10.3969/j.issn.2095-4344.2340

Abstract

Abstract:

BACKGROUND: In the treatment of severe acetabular dysplasia with total hip arthroplasty, it is still controversial whether the cup of the hip prosthesis should be placed in the true acetabulum or not.

OBJECTIVE: To analyze the stability of acetabular cup in different positions by simulating the process of total hip arthroplasty with digital orthopedics.

METHODS: Pelvic CT imaging data of eight patients with acetabular dysplasia (Crowe III) were collected. The pelvic and acetabular cups of patients were reconstructed using Mimics and Solidworks software. According to the size of the patient’s own acetabulum, a suitable acetabular prosthesis was installed at the position of the true acetabulum. The acetabular cup prosthesis was moved up to 20 mm in increments of 2 mm in order to compare the effective CE angle and the coverage of acetabular cup with different heights of acetabulum prosthesis.

RESULTS AND CONCLUSION: (1) When the acetabular cup was moved up to 14 mm above the true acetabulum, the maximum effective CE angle was (28.90±1.31)° and the corresponding acetabular cup diameter was (42.00±1.94) mm. There was no significant difference between the effective CE measured at 16, 18 and 20 mm above the true acetabulum (P > 0.05); there was significant difference between the other groups (P < 0.05). (2) When the acetabular cup was moved up to 12 mm above the true acetabulum, coverage rate of the acetabular cup was highest (93.16±1.04)%. At this time, the corresponding acetabular cup diameter was (43.00±1.73) mm, and there was no significant difference in the coverage rate of the acetabular cup measured at 14, 16, and 18 mm above the true acetabulum (P > 0.05); there was significant difference between the other groups (P < 0.05). (3) The correlation analysis showed that the effective CE angle was positively correlated with the coverage rate of acetabular cup as the position of acetabular cup moved up. (4) The results showed that the more stable acetabular cup would be obtained in the total hip arthroplasty by appropriately moving up the rotation center to treat acetabular dysplasia (Crowe III) without using structural bone transplantation.

Key words: bone, joint replacement, prosthesis, acetabulum, acetabular cup, digital orthopedics, imaging, 3D

CLC Number:

Zhao Yang, Chen Shirong. Stability of the acetabular cup in different positions to repair acetabular dysplasia[J]. Chinese Journal of Tissue Engineering Research, 2020, 24(33): 5289-5294.

Figures/Tables 9

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