VOL 29, NO 7 July 2014

CONTENTS

EDITORIAL 1331 Defi nition of Periprosthetic Joint Infection Javad Parvizi , Thorsten Gehrke , and The International Consensus Group on Periprosthetic Joint Infection

HOT TOPIC 1332 The “July Effect” in Primary Total Hip and Knee Arthroplasty: Analysis of 21,434 Cases From the

ACS-NSQIP Database Daniel D. Bohl , Michael C. Fu , Nicholas S. Golinvaux , Bryce A. Basques , Jordan A. Gruskay , and

Jonathan N. Grauer

1339 Surfi ng for Hip Replacements: Has the “Internet Tidal Wave” Led to Better Quality Information a Mujtaba Nassiri , Robert A. Bruce-Brand , Francis O'Neill , Shojaeddin Chenouri , and Paul T. Curtin

HEALTH POLICY & ECONOMICS 1345 Effect of Price Capitation on Implant Selection for Primary Total Hip and Knee Arthroplasty Mario Farías-Kovac , Caleb R. Szubski , Mark Hebeish , Alison K. Klika , Kirtishri Mishra , and

Wael K. Barsoum

1350 Predictors of the Need for Critical Care After Total Joint Arthroplasty: An Update of Our Institutional Risk Stratifi cation Model

P. Maxwell Courtney , Colin M. Whitaker , Jacob T. Gutsche , Eric L. Hume , and Gwo-Chin Lee

1355 Factors Determining Discharge Destination for Patients Undergoing Total Joint Arthroplasty a Behnam Sharareh , Natasha B. Le , Melinda T. Hoang , and Ran Schwarzkopf

PRIMARY ARTHROPLASTY 1359 Bariatric Surgery Prior to Total Joint Arthroplasty May Not Provide Dramatic Improvements in

Post-Arthroplasty Surgical Outcomes Maria C.S. Inacio , Elizabeth W. Paxton , David Fisher , Robert A. Li , Thomas C. Barber , and

Jasvinder A. Singh

1365 Uncemented Total Hip Arthroplasty Using a Tapered Femoral Component in Obese Patients: An 18–27 Year Follow-Up Study

Jeffrey R. McLaughlin and Kyla R. Lee

1369 No Differences Found in Bearing Related Hip Survivorship at 10–12 Years Follow-Up Between Patients With Ceramic on Highly Cross-Linked Polyethylene Bearings Compared to Patients With Ceramic on Ceramic Bearings

Jean-Alain Epinette and Michael T. Manley

1373 Polyethylene Wear and Osteolysis Is Associated With High Revision Rate of a Small Sized Porous Coated THA in Patients With Hip Dysplasia

Patrick J. Murray , Katherine L. Hwang , Susanna N. Imrie , James I. Huddleston III , and Stuart B. Goodman

(continued)

1378 A Comparison of Patient-Reported and Measured Range of Motion in a Cohort of Total Knee Arthroplasty Patients a Jamie E. Collins , Benjamin N. Rome , Meghan E. Daigle , Vladislav Lerner , Jeffrey N. Katz , and Elena Losina

1383 Preoperative Predictors of Pain Following Total Knee Arthroplasty Nicolas O. Noiseux , John J. Callaghan , Charles R. Clark , M. Bridget Zimmerman , Kathleen A. Sluka , and

Barbara A. Rakel

1388 Changes in the Functional Flexion Axis of the Knee Before and After Total Knee Arthroplasty Using a Navigation System

David A.J. Wilson , Janie L. Astephen Wilson , Glen Richardson , and Michael J. Dunbar

1394 Plateau–Patella Angle in Evaluation of Patellar Height After Total Knee Arthroplasty Brett N. Robin , Matthew D. Ellington , Daniel C. Jupiter , and Bryce C. Allen

1398 A Systematic Review of Clinical Outcomes and Survivorship After Total Knee Arthroplasty With a Contemporary Modular Knee System

Colin D.J. Hopley and David F. Dalury

REVISION ARTHROPLASTY 1412 Risk Factors for Total Hip Arthroplasty Aseptic Revision Monti Khatod , Guy Cafri , Robert S. Namba , Maria C.S. Inacio , and Elizabeth W. Paxton

1418 Tumor Endoprosthesis Revision Rates Increase With Peri-Operative Chemotherapy But Are Reduced With the Use of Cemented Implant Fixation

Luke R. Pugh , Paul W. Clarkson , Amy E. Phillips , David J. Biau , and Bassam A. Masri

1423 Anterior Distal Femoral Osteotomy for Removal of Long Femoral Stems in Revision Knee Arthroplasty Michael K. Merz and Yasser R. Farid

COMPLICATIONS – INFECTION 1426 Transfer of Patient Care During Two-Stage Exchange for Periprosthetic Joint Infection Leads to Inferior Outcomes Matthew J. Dietz , Ho-Rim Choi , Andrew A. Freiberg , and Hany Bedair

1430 All-Cause In-Hospital Complications and Urinary Tract Infections Increased in Obese Patients Undergoing Total Knee Arthroplasty

Matthew P. Abdel , Michael P. Ast , Yuo-yu Lee , Stephen Lyman , and Alejandro González Della Valle

1435 Intraoperative Fracture During Staged Total Knee Reimplantation in the Treatment of Periprosthetic Infection Adam A. Sassoon , Nathaniel J. Nelms , and Robert T. Trousdale

1439 The Impact of Patellar Resurfacing in Two-Stage Revision of the Infected Total Knee Arthroplasty Aaron Glynn , Ronald Huang , Javad Mortazavi , and Javad Parvizi

1443 Tantalum Acetabular Augments in One-stage Exchange of Infected Total Hip Arthroplasty: A Case–control Study

Till Orla Klatte , Daniel Kendoff , Reza Sabihi , Atul F. Kamath , Johannes M. Rueger , and Thorsten Gehrke

1449 Establishing a Role for Vancomycin Powder Application for Prosthetic Joint Infection Prevention—Results of a Wear Simulation Study

Rabah Qadir , J. Lockwood Ochsner , George F. Chimento , Mark S. Meyer , Bradford Waddell , and Joseph M. Zavatsky

COMPLICATIONS – OTHER 1457 A Nomogram to Predict Major Complications After Hip and Knee Arthroplasty Thomas H. Wuerz , David M. Kent , Henrik Malchau , and Harry E. Rubash

(continued)

1463 Patient-Reported Compliance with Thromboprophylaxis Using an Oral Factor Xa Inhibitor (Rivaroxaban) Following Total Hip and Total Knee Arthroplasty

Andrew D. Carrothers , Sebastian R. Rodriguez-Elizalde , Benedict A. Rogers , Helen Razmjou , Jeffrey D. Gollish , and John J. Murnaghan

1468 Does Resident Involvement Impact Post-Operative Complications Following Primary Total Knee Arthroplasty? An Analysis of 24,529 Cases

a Bryan D. Haughom , William W. Schairer , Michael D. Hellman , Paul H. Yi , and Brett R. Levine

1473 Does Speed Matter? Revision Rates and Functional Outcomes in TKA in Relation to Duration of Surgery a Simon W. Young , John Mutu-Grigg , Christopher M. Frampton , and John Cullen

1478 Modern Retrograde Intramedullary Nails Versus Periarticular Locked Plates for Supracondylar Femur Fractures After Total Knee Arthroplasty

R. Michael Meneghini , Brian J. Keyes , Kartheek K. Reddy , and Dean C. Maar

BASIC SCIENCE 1482 The Inter-Observer and Intra-Observer Reliability of the Paprosky Femoral Bone Loss Classifi cation System Nicholas M. Brown , Jared R.H. Foran , Craig J. Della Valle , Mario Moric , Scott M. Sporer , Brett R. Levine ,

and Wayne G. Paprosky

1485 The Effect of Strut Allograft and Its Position on Vancouver Type B1 Periprosthetic Femoral Fractures: A Biomechanical Study

Kerim Sariyilmaz , Fatih Dikici , Goksel Dikmen , Ergun Bozdag , Emin Sunbuloglu , Bugra Bekler , and Onder Yazicioglu

1491 Load Sharing and Ligament Strains in Balanced, Overstuffed and Understuffed UKA. A Validated Finite Element Analysis

Bernardo Innocenti , Ömer Faruk Bilgen , Luc Labey , G. Harry van Lenthe , Jos Vander Sloten , and Fabio Catani

1499 Compensatory Strategies for Muscle Weakness During Stair Ascent in Subjects With Total Knee Arthroplasty Joakim Bjerke , Fredrik Öhberg , Kjell G. Nilsson , and Ann K. Stensdotter

1503 Micromotion of Cementless Tibial Baseplates: Keels with Adjuvant Pegs Offer More Stability Than Pegs Alone Safi a Bhimji and R. Michael Meneghini

1507 LETTERS TO THE EDITOR