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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Differences In Pain, Sleep Status And Functional Recovery Between TKA And UKA ePoster Presentation Takeo Mammoto, MD, JAPAN
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Tibia Placement Difference Between The Supine And Prone Position After Total Knee Arthroplasty: The Comparison Of The BCS and PS-TKA ePoster Presentation Takanori Iriuchishima, MD, PhD, JAPAN Keinosuke Ryu, Prof., JAPAN Eiji Cho, MD, JAPAN
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Is Surgeon Assessed Bone Quality During Total Knee Arthroplasty a Valid Tool To Diagnose Osteoporosis ? ePoster Presentation Adit Rajesh Maniar, MBBS, MS Orthopaedics, DNB Orthopaedics, INDIA Arpit Vasantbhai Bavaskar, MBBS, D.Orth., INDIA Vishal Raina, MS, INDIA Akshay Nayak, M.B.B.S, M.S , INDIA Ashwini Khokhar, MS, INDIA Rajesh Maniar, INDIA
Does Robotic Assisted Unicompartmental Knee Arthroplasty Restore Native Jointline More Accurately Than With Conventional Instruments? ePoster Presentation Ashok Kumar Podhili Subramani, MS, INDIA Shantanu S. Patil, MBBS, MS(Orth), INDIA SAWAN PAWAR, MBBS MS (ORTH), INDIA Kalaivanan Kanniyan, MBBS MS Orth, INDIA karthik jayachandran, MS, INDIA PICHAI SURYANARAYAN, MBBS MS ORTH, INDIA
Combined Fixed-Bearing Unicompartmental Knee Arthroplasty and Anterior Cruciate Ligament Reconstruction ePoster Presentation Claudio Legnani, MD, ITALY Enrico Borgo, MD, ITALY Vittorio Macchi, MD, ITALY Alberto Ventura, MD, ITALY
Impact of Femur Correction on the Mechanical Alignment of the Total Knee Prosthesis ePoster Presentation Israel Alejandro Alejandro González Rizo, MD, MEXICO Fidel G Dobarganes, Prof, MEXICO Jorge Negrete Corona, MD, MEXICO Alberto Guevara-Alvarez, MD, MEXICO Franco Garcini Munguia, MD, MEXICO
Patient Satisfaction and Functional outcomes in a Latin American cohort: Comparative Study Between Conventional Technique vs. Robotic Arm Assistance. ePoster Presentation Rafael Calvo, MD, CHILE Maria Loreto Figueroa Berrios, MD, CHILE Rodrigo Guiloff, MD, Prof, CHILE Zoy Anastasiadis, MD, CHILE David H. Figueroa, MD, CHILE
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Intraoperative Varus-Valgus Joint Laxity Pattern Was Associated With Postoperative Knee Flexion Angle and Patient-Reported Outcome Measures in Bicruciate-Stabilized Total Knee Arthroplasty. ePoster Presentation Ryota Yamagami, MD, JAPAN Kenichi Kono, MD, PhD, JAPAN Kohei Kawaguchi, MD, PhD, JAPAN Tomofumi Kage, JAPAN Ryo Murakami, MD, JAPAN Takahiro Arakawa, MD, JAPAN Hiroshi Inui, PhD, JAPAN Shuji Taketomi, MD, PhD, JAPAN Sakae Tanaka, MD, PhD, JAPAN
Participation of Physical Activity Following Knee Arthroplasty: A Meta-Analysis ePoster Presentation Ahmed A Magan, BM BSc (Hons) MRCS (Eng) FRCS (Eng) Trauma & Orth, UNITED KINGDOM Babar Kayani, BSc (HONS), MBBS, MRCS (Eng), UNITED KINGDOM Warran Wignadasan, MBBS, BSc (Hons), MRCS, UNITED KINGDOM Dia Eldean Giebaly, MBChB, MSc, FRCS, EMBA, UNITED KINGDOM Flaminia Ronca, PHD, UNITED KINGDOM Fares S. Haddad, MCh(Orth), BSc, FRCS(Orth), UNITED KINGDOM
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
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
Accuracy of the Component Alignment and Sizing in Total Knee Arthroplasty: Preoperative Templating and Postoperative Evaluation Using CT-Based 3D Pre-Operative Planning Software ePoster Presentation Takayuki Koya, MD, PhD, JAPAN Atsushi Sato, MD, PhD, JAPAN Jun Oike, MD, PhD, JAPAN Masataka Ota, MD, JAPAN Kanako Izukashi, MD, JAPAN Takayuki Okumo, MD, PhD, JAPAN Saki Yagura, MD, JAPAN Naoki Okuma, MD, JAPAN Fumiyoshi Kawashima, MD, JAPAN Hiroshi Takagi, MD, PhD, JAPAN Koji Kanzaki, Prof., JAPAN
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
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
Same Complication Rate After Day-Case Procedure Or Fast-Track Procedure After Total Hip And Knee Arthroplasty. A Prospective, Propensity Score-Matched Case-Control Study ePoster Presentation Jean-Yves Jenny, Prof., FRANCE Vincent Gisonni, MD, FRANCE
Hip-Knee-Ankle Angle Affects Medial and Lateral Tibiofemoral Compressive Forces More Significantly than Joint Line Obliquity in Patients Post Total Knee Arthroplasty ePoster Presentation David A. Parker, MBBS, BMedSc, FRACS, AUSTRALIA Myles R. J. Coolican, FRACS, AUSTRALIA Brett A. Fritsch, MBBS BSc(Med), FRACS, FAOrthA, AUSTRALIA Alexander S. Nicholls, MSc, FRACS, AUSTRALIA Payam Tarassoli, MBChB, BSc, DipSEM, MD, FRCS, AUSTRALIA Yoong Lim, BEng, PhD, AUSTRALIA

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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