Fellows have the opportunity to work on research projects that may lead to publications or presentations. They have access to the computerized clinical database and radiographic archives of Anderson Clinic hip and knee replacement patients. The hip and knee databases along with the radiographic archives are unsurpassed in total joint arthroplasty in terms of volume of patients, the longevity, and completeness of patient follow up. AORI has the largest collection of revised failed hip and knee implants along with the largest collection of post mortem implants in the world, which allows unprecedented studies of how older implants performed and how they failed. The Fellows are supported by AORI’s research laboratory, engineering and statistical staff, photographic capabilities and library services provided by INOVA Fairfax.
A Multi-Center, Prospective, Randomized Study of Outpatient versus Inpatient Total Hip Arthroplasty
Goyal N, Padgett SE, Chen AF, Tan TL, Kheir MM, Hopper, RH Jr, Hamilton WG, Hozack WJ.
This award winning study found hip replacement surgery just as satisfying for outpatients as for those patients staying a minimum of one night in the hospital. Dr. Nitin Goyal, and Dr. William Hamilton of AORI and colleagues from The Rothman Institute in Philadelphia, compared patient’s overall satisfaction with their hip replacement and their next day pain levels. Over two hundred randomly chosen patients were assigned to the either go home the same day or stay at least one night. The study also compared the number of follow up calls, doctor visits and post-surgical problems. Patients who went home the same day experienced slightly higher pain levels on the day after surgery compared to those who had at least one-night hospital stay. But the outpatients had a higher overall satisfaction with their surgery. Neither group exceeded the other in calls to the doctor or follow-up issues. The results of this study suggest outpatient total hip replacements work well for some patients.
Read more: Clin Orthop Relat Res. 2016 Jun 10. 2013.
March 28, 2016
Clinical Faceoff: Where Are We Going With Femoral Stem Fixation in THA?
Moskal JT, Capps SG, Engh CA Jr, Troelsen A.
Dr. Andy Engh of AORI, Alexandria, VA, and Dr. Anders Troelsen of Dept. of Orthopaedic Surgery, Copenhagen University Hospital alternately discuss the different trends in femoral stem fixation comparing the various methods of fixation in the US and Europe. Dr. Andy Engh states research shows cementless femoral implants are more durable for younger total hip replacement patients while cemented implants seem to work better with less fractures in older patients. Dr. Andy also remarks about the fact that North American doctors are generally not teaching how to cement so the practice is being used less. Dr. Anders suggested that the use of cement is still more common in Europe and that the practice of doing so needs to continue to be taught to the new generations of clinicians.
March 26, 2016
Severely Obese Patients Have a Higher Risk of Infection After Direct Anterior Approach Total Hip Arthroplasty.
Purcell RL, Parks NL, Gargiulo JM and Hamilton WG
Anderson Orthopaedic Research Institute’s clinical and scientific investigators: Dr. Rick: Purcell, Nancy Parks, Jeanine Gargiulo and Dr. Bill Hamilton, reported that obese patients with a Body Mass Index of greater than 35, (≥35kg/m2), are at a substantially increased risk for a postoperative infection warranting revision surgery when the anterior surgical approach is used. This is likely due to the deep abdominal folds overlaying the incision. The investigators suggest comparative studies should be done using other surgical approaches with obese individuals to determine if the infections were primarily due to the approach or if significant increase in body mass increases overall risk of infections in hip patients.
No Difference in Reoperations at 2 Years Between Ceramic-on-metal and Metal-on-metal THA: A Randomized Trial
Ench CA Jr, Sritulanondha S, Korczak A, Whalen TD, Naudie DDR, McCalden, RW, MacDonald SJ.
Anderson Orthopaedic Research Institute investigators and fellow collaborators from Division of Orthopaedic Surgery, Joint Replacement Institute, London Health Sciences Centre, London, Ontario, Canada, participated together in a prospective randomized trial comparing Ceramic-on-metal, (CoM), with Metal-on-metal, (MoM), bearings, the adjoined surfaces between the ball replacement on the top of the femur, and the cup insertion into the socket joint, or the acetabulum. Three hundred and ninety patients were enrolled in the trial at 11 different centers. Of the 390, 194 received ceramic-on-metal bearing surfaces while 196 received metal-on-metal bearings in their hip replacements. The short term follow-up for both groups showed successful performance of the hip implants. However, while the MoM group had a higher level of metal ions, the researchers decided that the CoM would need longer studies to see if it continued to perform well over time.
February 1, 2016
CORR Insights ® : Is There a Benefit to Modularity in ‘Simpler” Femoral Revisions?
Dr. Andy Engh of AORI comments on the article with the same name by Huddleston and colleagues. In his commentary, Dr. Andy shares the importance of using the best method for each individual patient so the patient returns to maximal functional ability and best quality of life.
Short-term Results of Birmingham Hip Resurfacing in the United States.
Nam D, Nunley RM, Ruh EL, Engh CA Jr, Rogerson JS, Brooks PJ, Raterman SJ, Su EP, Barrack RL.
This group of collaborative investigators from 5 US centers including AORI were seeking information on success rates of Birmingham Hip Resurfacings done on 1271 patients between 2006-2008 in a 2 to 4 year follow up. Of the 1144 contacted either by phone or follow up appointments, only 16 patients needed revisions to total hip replacements. It appears the Birmingham Hip Resurfacing patients, 75% of whom were male were fairing as well as patients who had regular total hip replacements.
Greater Trochanteric Fragmentation After Failed Metal-on-Metal Hip Arthroplasty.
Panichkul P, Fricka KB, Hopper RH Jr, Engh CA Jr.
The AORI investigators take a clinical and scientific look at bone loss of the greater trochanter in two patients after hip revision surgeries for failed metal-on-metal (MoM) hips. Both patients had revision surgeries replacing the failed metal-on-metal with polyethylene bearings. Yet 1-2 years later, both of these patients developed greater trochanteric fragmentation. This study warns that necrotic tissues may include bone as well as soft tissue. Orthopaedic doctors may wish to become mindful of this and pay attention for symptoms in potential hip revision patients.
April 29, 2014
The functional assessment test: a method of evaluating improvement in function after knee arthroplasty.
Engh GA, Sheridan MJ, Ammeen DJ.
Dr. Jerry Engh and research colleagues developed an easily administered timed test called the Functional Assessment test to determine if knee replacement patients improved their daily activity skills. The test included standing, walking and climbing stairs. The researchers concluded the FA test would be practical in a clinical environment.
March 19, 2014
Metal ion levels after metal-on-metal total hip arthroplasty: a five-year, prospective randomized trial.
Engh CA Jr, MacDonald SJ, Sritulanondha S, Korczak A, Naudie D, Engh C.
Fellow investigators from Anderson Orthopaedic Research Institute in Alexandria, VA and London Health Sciences Centre-University Hospital Orthopaedics, Ontario Canada studied a randomized group of patients undergoing total hip arthroplasty. The 105 patients did not know which of three categories of implant they would receive. The three types of implants used were as follows: 28-mm metal-on-polyethylene, 28-mm metal-on-metal or 36-mm metal-on-metal. The U.S. Food and Drug Administration desired follow-up data for these after-market devices. Metal levels were tested in all patients. The outcome of the tests showed the metal-on-metal hip patients and particularly the 36-mm patients had higher levels of metal ions in their blood at the five-year follow up. The metal-on-polyethylene group had appreciably lower metal ions in their blood. The investigators indicate watching the metal-on-metal group closely.
Research Summaries Written and Compiled by, Renée Burkett, Writer. © Copyright AORI 2016. All Rights Reserved.