Dataset Information

In vivo kinematics of cruciate-retaining total knee arthroplasty after a change of polyethylene insert configuration.

ABSTRACT:

Background

To investigate in vivo kinematics of total knee arthroplasty (TKA) with the introduction of a mildly constrained (MC) type of polyethylene (PE). We compared the knee kinematics with a reported pattern after surgery using the same component with a conventionally constrained (CC) type of PE.

Methods

Finite element analysis (FEA) was performed to examine different peak stress distribution of both types of PE. For in vivo study, patients who underwent cruciate-retaining TKA using a total knee system with MC-PE were included. Fluoroscopic surveillance was used to measure the weight-bearing deep knee bend (squatting) using a two-dimensional/three-dimensional (2-D/3-D) registration technique.

Results

FEA analysis revealed the edge loading of the femoral component on PE in CC but not in MC. During the study period, 42 patients underwent TKA with MC-PE. Among them, 13 agreed to participate in the present study. In vivo kinematics analysis found that starting from an average external rotation of femur being 7.1° at 0° of flexion, the rotation slightly decreased to 6.8° at 10° of flexion, then increased with increasing knee flexion until it reached 10.8° at 80° of flexion, and finally decreased to 9.8° at 100° of knee flexion. The results indicate a modest medial pivot pattern. Although the overall pattern was similar for both MC-PE and CC-PE, a slight difference was observed. MC-PE showed a slight internal rotation of 0.3° from 0 to 10° of knee flexion, whereas CC-PE showed a gradual increase of external rotation in this range.

Conclusions

Change of configuration from CC to MC did not substantially affect in vivo kinematics of knees after TKA. Considering the theoretical wider range of allowance of rotation, MC-PE is easier for knee surgeons to use.

SUBMITTER: Watanabe S

PROVIDER: S-EPMC7782324 | biostudies-literature | 2021 Apr

REPOSITORIES: biostudies-literature

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Publications

In vivo kinematics of cruciate-retaining total knee arthroplasty after a change of polyethylene insert configuration.

Watanabe Shotaro S Tomita Tetsuya T Akagi Ryuichiro R Watanabe Atsuya A Yamazaki Takaharu T Enomoto Takahiro T Nakagawa Ryosuke R Kimura Seiji S Ohtori Seiji S Sasho Takahisa T

Asia-Pacific journal of sports medicine, arthroscopy, rehabilitation and technology 20201231

<h4>Background</h4>To investigate in vivo kinematics of total knee arthroplasty (TKA) with the introduction of a mildly constrained (MC) type of polyethylene (PE). We compared the knee kinematics with a reported pattern after surgery using the same component with a conventionally constrained (CC) type of PE.<h4>Methods</h4>Finite element analysis (FEA) was performed to examine different peak stress distribution of both types of PE. For in vivo study, patients who underwent cruciate-retaining TKA ...[more]

PMID: 33457208

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Dataset Information

In vivo kinematics of cruciate-retaining total knee arthroplasty after a change of polyethylene insert configuration.

Background

Methods

Results

Conclusions

Publications

In vivo kinematics of cruciate-retaining total knee arthroplasty after a change of polyethylene insert configuration.

Similar Datasets

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