Action mechanism for effects of tibial rotational alignment technique on patellofemoral joint biomechanics

doi:10.3969/j.issn.2095-4344.2016.22.015

Abstract

Abstract:

BACKGROUND: At present, the placement of tibial anatomic landmarks has no gold standard during total knee arthroplasty. In order to achieve the most ideal rotation function of the tibial prosthesis, we should do the preparation before surgery, understand tibial rotational alignment to rationally select and apply the prosthesis.

OBJECTIVE: To investigate the effect of tibial rotational alignment technique on patellofemoral joint biomechanics and related mechanisms.

METHODS: Ten pairs of human knee joint specimens were collected to prepare experimental platform. Specimens were fixed on the experiment frame, which was fixed on the material testing instrument for mechanics experiment. We set different knee flexion angles, including 30°, 60°, 90° and 120°. Joint replacement was performed with the knee prosthesis. Samples were randomly assigned to two groups (n=5). Tibial nodule technology and ROM technology were used to identify rotational alignment of the tibial prosthesis. The medial and lateral patellofemoral joint contact pressure peak and patellofemoral contact area at different knee angles, and the medial and lateral parts of patellofemoral contact area at deep knee angles were observed in both groups.

RESULTS AND CONCLUSION: (1) During flexion angle from 30° to 60°, the peak contact pressure of medial patellofemoral joint increased, and decreased gradually in both groups. At flexion angle of 90°, contact pressure reached the minimum value, then increased gradually, and reached the maximum value at 120°. No significant difference in peak contact pressure of medial patellofemoral joint at different knee angles was detected between the two groups (all P > 0.05). (2) During flexion angle from 30° to 60°, peak contact pressure of lateral patellofemoral joint decreased constantly, and then gradually increased. No significant difference in peak contact pressure of lateral patellofemoral joint at different knee angles was detectable between the two groups (all P > 0.05). (3) During flexion angle from 30° to 60°, patellofemoral contact area decreased, and then increased gradually in both groups. No significant difference in patellofemoral contact area at different knee angles was identified between the two groups (all P > 0.05). (4) At 90° and 120°, no significant difference in the area of medial and lateral contact parts was determined between the two groups (all P > 0.05). (5) Experimental results showed that tibial nodule technology and ROM technology for identifying tibial rotational alignment during total knee arthroplasty can obtain considerable biomechanical effects of patellofemoral joint.

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, Knee, Prosthesis Implantation, Biomechanics, Tissue Engineering

CLC Number:

R318

Liu Kai. Action mechanism for effects of tibial rotational alignment technique on patellofemoral joint biomechanics[J]. Chinese Journal of Tissue Engineering Research, 2016, 20(22): 3301-3307.

Figures/Tables 1

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