Summary: Surgeons should be aware of this occurrence of size differences to avoid improperly sizing the second knee based only on its contralateral counterpart.

Introduction

The importance of anatomic variation in knee replacement prosthesis selection has gained popularity, encouraging more prosthesis size options for proposed customization and personalization. Size differences can also occur between knees of the same individual. The purpose of this study is to evaluate the frequency of anatomic variation between knees within the same patient and to determine whether outcomes differ depending on the component size.

Methods

From 2008-2017, 530 patients underwent staged or simultaneous bilateral knee replacements by a single surgeon. Of the 1060 procedures, there were 400 simultaneous TKAs and 660 staged procedures. Patients had an average of 70 at time of the first surgery, and BMI of 30. Patients were evaluated for perioperative complications and by clinical outcomes. Radiographs were evaluated for implant positioning and appropriateness of size.

Results

Component sizes differed within the same patient in 36.2% (384/1060). Femoral sizes differed in 50 patients (4.7%), the tibia 55 (5.2%), the patella 46 (4.3%), and liner 233 (22.0%). In 12 patients, the femur and tibia simultaneously differed in size from one knee to the other. The liner size differed simultaneously with 14 patients with differing femurs, and was thicker in 13 knees with larger tibial components, and thicker in 9 with smaller tibial components. Tibial size did not seem dependent on depth of tibial resection as the tibial insert thickness did not correlate with smaller tibial sizes (p=0.47).

Discussion

Liner thickness most frequently varies between knees, but femoral, tibial, and patellar component sizes can also differ with some regularity. Surgeons should be aware of this occurrence of size differences to avoid improperly sizing the second knee based only on its contralateral counterpart. The variability in prosthesis size is appropriate anatomically and leads to comparable outcomes compared to the contralateral knee.

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Use of Tibial Stem for Patients with Morbid Obesity in Total Knee Arthroplasty ePoster Presentation José Eduardo Flores Naranjo, MD, MEXICO Adrian Aziz Cortes De La Fuente, MD, MEXICO Octavio Martinez Montiel, MD, MEXICO Fernando Martinez Zuñiga, MD, MEXICO
Treatment of Periprosthetic Infection after Total Knee Arthroplasty using an Ultrastatic Spacer ePoster Presentation Gloria Shoshana Coden, MD, UNITED STATES Suzanne Kent, MD, UNITED STATES Ruijia Niu, MPH, UNITED STATES Ayesha Abdeen, MD, UNITED STATES Eric L. Smith, MD, UNITED STATES
Patellar Medial-lateral Position can be Used to Correct the Effect of Leg Rotation on Preoperative Planning in Total Knee Arthroplasty for Varus Knees ePoster Presentation Shinichiro Nakamura, MD, PhD, JAPAN Shota Takemoto, MD, JAPAN Shinichi Kuriyama, MD, PhD, JAPAN Kohei Nishitani, MD, PhD, JAPAN Hiromu Ito, MD, PhD, JAPAN Mutsumi Watanabe, MD, PhD, JAPAN Young Dong Song, MD, PhD, UNITED STATES Shuichi Matsuda, MD, PhD, JAPAN
Relationship Between The Femoral And Tibial Component Positions And Postoperative Knee Range Of Motion After Posterior-Stabilized Total Knee Arthroplasty ePoster Presentation Mitsuru Hanada, MD, PhD, JAPAN Yukihiro Matsuyama, MD, PhD, Prof., JAPAN
Bilateral Simultaneous Unicompartimental Knee Arthroplasty. Midterm Results in 86 Arthroplasties with an Average Follow-Up Of 6.2 Years ePoster Presentation Stefano Gaggiotti, MD, ARGENTINA Gabriel Gaggiotti, MD, ARGENTINA Santino Gaggiotti, MD, ARGENTINA Julio Cesar Ringa
Antero-Posterior Translation of Mobile-Bearing in Mobile-Bearing Unicompartmental Knee Arthroplasty ePoster Presentation Takahiro Arakawa, MD, JAPAN Kenichi Kono, MD, PhD, JAPAN Tetsuya TOMITA, MD, PhD, JAPAN Shuji Taketomi, MD, PhD, JAPAN Ryota Yamagami, MD, JAPAN Kohei Kawaguchi, MD, PhD, JAPAN Tomofumi Kage, JAPAN Ryo Murakami, MD, JAPAN Hiroshi Inui, PhD, JAPAN Sakae Tanaka, MD, PhD, JAPAN
The Statistical Fragility of Tourniquet Use In Total Knee Arthroplasty: A Systematic Review ePoster Presentation Kyle William Lawrence, BS, UNITED STATES John K Cordero, MD, UNITED STATES Ashley Brown, BS, UNITED STATES Xinning Li, MD, UNITED STATES Brett Hayden, MD, UNITED STATES Robert L Parisien, MD, UNITED STATES
Total Knee Arthroplasty Without Patellar Component Replacement. Does it Increase the Risk of Revision? Local Experience Analysis ePoster Presentation Zoy Anastasiadis, MD, CHILE Diego Edwards, MD, CHILE Sergio Arellano, MD, CHILE Andrés Schmidt-Hebbel, MD, CHILE Eduardo Gardella, MD, CHILE Nicolás González-Kusjanovic, MD, MSc, CHILE Alex Vaisman, MD, Prof., CHILE

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Implant Size and Outcome Differences of Knees in Same Patient for Simultaneous vs Staged Bilateral TKA

Implant Size and Outcome Differences of Knees in Same Patient for Simultaneous vs Staged Bilateral TKA

Introduction

Methods

Results

Discussion

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Implant Size and Outcome Differences of Knees in Same Patient for Simultaneous vs Staged Bilateral TKA

Implant Size and Outcome Differences of Knees in Same Patient for Simultaneous vs Staged Bilateral TKA

Introduction

Methods

Results

Discussion

More 2023 ISAKOS Congress Content