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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Patellofemoral Arthroplasty In Community Programs: Case Series of 425 Patients ePoster Presentation Alexander P. Sah, MD, UNITED STATES
Is Surgeon Assessed Bone Quality During Total Knee Arthroplasty a Valid Tool To Diagnose Osteoporosis ? ePoster Presentation Adit Maniar, MBBS, MS Orthopaedics, DNB Orthopaedics, CANADA 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
No Difference In Sports Participation And Patient-Reported Functional Outcomes Between Total Knee Arthroplasty And Unicompartmental Knee Arthroplasty At Minimum 2-Year Follow-Up In A Matched Control Study ePoster Presentation Amit Meena, MBBS, MS, DNB, INDIA Elisabeth Abermann, MD, AUSTRIA Christian Hoser, MD, AUSTRIA Luca Farinelli, MD, ITALY Caroline Hepperger, PhD, AUSTRIA Akshya Raj, MBBS,MS, INDIA Mohit Kumar Patralekh, MBBS, MS(Orthopaedics), DNB(Orthopaedics), MNAMS, INDIA Christian Fink, MD, Prof., AUSTRIA
Comparison of Outcomes between Fungal and Non-fungal Periprosthetic Joint Infections in Total Knee Arthroplasty: A Propensity Score-Matched Analysis ePoster Presentation Hong Yeol Yang, MD, PhD, KOREA, REPUBLIC OF Jong-Keun Seon, MD, PhD, Prof, KOREA, REPUBLIC OF
Advanced Active Robotic Technology for Total Knee Arthroplasty: A Learning Curve of Operative Time and Alignment Accuracy ePoster Presentation Yong-Beom Park, MD, PhD, KOREA, REPUBLIC OF Young-Bong Ko, MD, KOREA, REPUBLIC OF Dong-Hoon Lee, MD, KOREA, REPUBLIC OF Hyun-Chul Nam, MD, KOREA, REPUBLIC OF Seong-Hwan Kim, MD,Ph.D, MStat, KOREA, REPUBLIC OF
Short Term Outcome of Tibial Defect Reconstruction In Primary Total Knee Arthroplasty: A Retrospective Study ePoster Presentation Sanjib Kumar Behera, MS (Orth), DNB (Rehab), DPMR, INDIA Madhumita Pradhan, BDS, MPH, MHA , INDIA Vikram Choudhary, MD, UNITED STATES
Palliative Arthroscopic Debridement with Continuous Irrigation for the Infection TKA of High Mortality Risk Patients ePoster Presentation Yoon Sang Jeon, MD, KOREA, REPUBLIC OF Sung-Sahn Lee, MD., PhD., KOREA, REPUBLIC OF Yoon Cheol Nam, MD, KOREA, REPUBLIC OF Dong Jin Ryu, MD, PhD., KOREA, REPUBLIC OF
A Prospective Randomised Study to Compare the Clinical and Radiological Outcomes of Functionally Aligned versus Mechanically Aligned Total Knee Arthroplasty with Robotic Arm Assistance ePoster Presentation Jai Thilak, MS, MCh, FRCS, INDIA Amal Antony Paul, MBBS, INDIA
Intra- And Inter-Operator Reliability Assessment Of A Novel Extramedullary Accelerometer-Based Smart Cutting-Guide For Total Knee Arthroplasty: An In-Vivo Study ePoster Presentation Stefano Zaffagnini, MD, Prof., ITALY Domenico Alesi, MD, ITALY Arcangelo Russo, MD, ITALY Mirco Lo Presti, MD, ITALY Iacopo Sassoli, MD, ITALY Matteo La Verde, MD, ITALY Giulio Maria Marcheggiani Muccioli, MD, PhD, Associate Professor, ITALY

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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