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Orthopaedic Proceedings
Vol. 98-B, Issue SUPP_8 | Pages 39 - 39
1 May 2016
THE EFFECT OF FEMORAL HEAD DIAMETER, SURGICAL APPROACH, SURGEON'S EXPERIENCE FOR THE DISLOCATION RATE OF PRIMARY TOTAL HIP ARTHROPLASTY
Hirakawa K Nakura N
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Introduction

It has been postulated that the larger femoral head size may be associated with reduced risk of dislocation after total hip arthroplasty(THA). However, Dislocation after THA has a multifactorial etiology with variables such as femoral head size, type of cup, stem and surgical approach.

Objectives

The objectives of this study is to evaluate the association between femoral head component head size, surgical approach, surgeon's experience and the rate of dislocation after THA.

Orthopaedic Proceedings
Vol. 98-B, Issue SUPP_10 | Pages 87 - 87
1 May 2016
THREE ADVERSE LOCAL TISSUE REACTION CASES EXPRESSED AS OSTEOLYSIS OR DEEP VEIN THROMBOSIS AFTER TOTAL HIP ARTHROPLASTY USING THE SAME MODULAR NECK STEM
Tsuji K Hirakawa K Nakura N Saito A Tamaki Y
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Introduction

Corrosion at the modular junction of the femoral component in total hip arthroplasty (THA) was considered as a cause of adverse local tissue reaction in recent years. We reported three adverse local tissue reaction cases after total hip arthroplasty using the same modular neck stem in this study.

Materials and Methods

We have been essentially using the same titanium modular neck stem system and the same combination bearing surface of 26mm cobalt chromium (CoCr) head and highly cross linked polyethylene line for primary total hip arthroplasty since November 2009. Three female showed adverse local tissue reaction and had additional surgical treatment after the THA.

Orthopaedic Proceedings
Vol. 92-B, Issue SUPP_II | Pages 328 - 329
1 May 2010
MOTION ANALYSIS AFTER MOBILE UKA AND TKA
Tatsumi I Hirakawa K Matsuda Y Tsuji K Takayanagi S Nakura N Nakasone S
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Introduction: The purpose of this study is to determine in vivo femorotibial axial rotation magnitudes and patterns in mobile-bearing posterior stabilized total knee arthroplasty (PS-TKA) and unicondylar knee arthroplasty (UKA) in deep flexion.

Material and Methods: Using video fluoroscopy, 12 subjects having a mobile-bearing PS-TKA (NexGen LPS Flex) and 12 subjects having a mobile-bearing UKA (Oxford UNI) were analyzed to determine their in vivo kinematic patterns under both weight bearing and non weight bearing. All implants were implanted by the same surgeon and were judged successful clinically with no pain and ligament laxity. The femoral and tibial components were overlaid onto the fluoroscopic images using a three-dimensional automated model-fitting technique to determine joint mobility.

Results: The average range of motion was 124 degrees of flexion for the PS-TKA and 137 degrees of flexion for the UKA. Although subjects in this study exhibited variable motion pattern, the common is anterior movement in extension to 45 degrees of flexion and posterior movement in 60 degrees of flexion to full flexion. The average internal rotation of the tibia was 18 degrees in UKA and 6 degrees in PS-TKA at 100 degrees of flexion to full. Incidence of lateral condylar lift off greater than 2mm was 5 in the PS-TKA and 1 in the UKA.

Discussion: A medial pivot kinematic pattern was observed in deep flexion in UKA. However in extension to 45 or 60 degrees of flexion, anterior condylar movement was observed in both groups. The motion pattern of UKA in 60 degree of flexion to full was close to the natural knee motion.