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Orthopaedic Proceedings
Vol. 98-B, Issue SUPP_1 | Pages 30 - 30
1 Jan 2016
Asano T Takagi M Narita A Takakubo Y Suzuki A Sasaki K Oki H
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Background

A navigation system is useful tool to evaluate the intraoperative knee kinematics. Rheumatoid arthritis (RA) patients often need to have TKA operation, however, there are few TKA kinematics studies comparing RA and Osteoarthritis (OA) patients.

Objective

The purpose of this study was to evaluate intraoperative TKA kinematics, and to describe the difference of kinematics between RA and OA patients.


Orthopaedic Proceedings
Vol. 98-B, Issue SUPP_4 | Pages 73 - 73
1 Jan 2016
Togashi E Fukushima S Sugawara H Narita A Takagi M
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Various types of tibial alignment guides exist, the results in performing the tibial resection in total knee arthroplasty (TKA) are more or less than we desired. In addition, it is difficult to estimate the accuracy of tibial component alignment with radiograph because it is difficult to get true frontal and lateral view. In this study, we use new tibial alignment guide and estimate tibial component alignment by using postoperative CT scan.

30 knees underwent TKA using an accelerometer-based, portable navigation device (KneeAlign 2) and postoperative CT scans were obtained. Postoperative CT scans of the lower limbs analysed by 3D digital template system (Athena), demonstrated that 96.6% of the tibial components were placed within 90°± 2°to the mechanical axis in the coronal plane, and 96.6% of the components were placed within 3°± 2°to the mechanical axis in the sagittal plane.

As a result of this study, an accelerometer-based, portable navigation device can expect to decrease outliers in tibial component alignment.


Orthopaedic Proceedings
Vol. 98-B, Issue SUPP_3 | Pages 81 - 81
1 Jan 2016
Narita A Asano T Suzuki A Takagi M
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Background

Septic knee arthritis is one of the most serious complications after total knee arthroplasty (TKA), and the effectiveness of its treatment affects the patient's quality of life. In our super-aging society, the frequency of TKA in the elderly, often combined with various comorbidities, is increasing. Careful management should be considerd during the management of septic arthritis after TKA in these patients.

Purpose

To analyze the clinical features and outcomes of septic arthritis after TKA in our institution.


Orthopaedic Proceedings
Vol. 98-B, Issue SUPP_4 | Pages 45 - 45
1 Jan 2016
Takakubo Y Sasaki K Narita A Oki H Naganuma Y Hirayama T Suzuki A Tamaki Y Togashi E Kawaji H Fukushima S Ishii M Takagi M
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Objectives

Biologic agents (BIO) drastically changed the rheumatoid arthritis (RA) therapy from starting to use biologics at 2003 in Japan. The rate of orthopaedic surgery, especially total joint arthroplasty (TJA) may reflect trends in disease severity, management and health outcomes.

Methods

We surveyed the number and rate of orthopaedic surgeries and TJA in RA treatment with BIO in the last decade, so called BIO-era.


Orthopaedic Proceedings
Vol. 98-B, Issue SUPP_1 | Pages 142 - 142
1 Jan 2016
Fukushima S Togashi E Sugawara H Narita A Takagi M
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It is very important for implanting tibial component to prevent bearing dislocation in Oxford UKA. One of the keys is accurate rotational position of tibia. But the problem remains what is accurate rotation of tibia in UKA.

Oxford Signature decided the rotation of tibia component from MRI images. We measured the component rotation of tibia using CT after operation.

Patients and Methods

14 patients were operated by Oxford Signature and 11 patients were operated by Microplasty method. Patients were examined by CT 2 or 3 weeks later after operation. We compared component axis of tibia and A-P axis by best fit circle, Akagi's line.

Results

In Oxford Signature group, component angle were 7.1 degree external rotation compared with A-P axis by best fit circle and were 3.6 degree external rotation compared with Akagi's line. In Microplasty group, component angle were 8.1 degree external rotation compared with A-P axis by best fit circle and were 3.8 degree external rotation compared with Akagi's line.