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Mercer Bucks Orthopaedics' mission is to deliver highest-quality orthopaedic care to the community in an efficient and cost-effective manner by creating an environment that fosters mutual respect and cooperation among our physicians and our staff for the best possible patient experience.



Mercer-Bucks Orthopaedics was founded in 1988 by four physicians: Dr. Eingorn, Dr. Bills, Dr. Nolan and Dr. Ford; they are all still practicing at MBO. All four individuals grew-up in the Mercer County, NJ - Bucks County, PA areas and desired to return to their hometowns, after training in medicine, to serve their communities.

Over the years, the group continued to expand by recruiting additional physicians to meet the growing demand for orthopaedic services in the community. To be more accessible and convenient, the group established offices in three locations, providing expanded services in both diagnostic and rehabilitative procedures to a wider service area.

Last year, over 35,000 of our fellow citizens visited our three MBO offices, resulting in over 70,000 unique  visits.



Edward J. Armbruster, DO, MA

  Edward J. Armbruster, DO, MA

Dr. Armbruster is an orthopaedic surgeon with advanced specialty training in hand, upper extremity and microvascular surgery. He joined MBO in 2010 after having practiced in Bucks County since 2007.

Dr. Armbruster was born in Atlantic City and grew up at the Jersey Shore. He attended the University of Michigan in Ann Arbor, receiving his B.S. in Chemistry and Cellular and Molecular Biology. He then studied at the Boston University School of Medicine, earning a Master of Arts in Medical Sciences. There he researched the molecular basis of arthritis and connective tissue disorders in the Department of Rheumatology at their National Arthritis Laboratory.

Dr. Armbruster returned to our area to attend the Philadelphia College of Osteopathic Medicine, earning a Doctor of Osteopathic Medicine (D.O.) degree. He completed his Internship and Orthopaedic Surgery Residency training at the University of Medicine and Dentistry of New Jersey (UMDNJ) – School of Osteopathic Medicine in Stratford, New Jersey. During this time he served at Cooper University Hospital for Level I orthopaedic trauma care, as well as A.I. DuPont Hospital for Children in Wilmington, DE for pediatric orthopaedic care. He also served as Assistant Team Physician to the Camden Riversharks Professional Baseball Organization for the 2003 through 2007 seasons.

Dr. Armbruster completed advanced fellowship training at UMDNJ – New Jersey Medical School in Newark, New Jersey in Hand, Upper Extremity and Microvascular Surgery. He is board-certified in Orthopaedic Surgery and earned a Certificate of Added Qualification in Surgery of the Hand (CAQSH).  Dr. Armbruster has been elected to full active membership in the American Society for Surgery of the Hand (ASSH), recognized as the premier medical society dedicated to upper extremity care, research and education.  He brings to our practice advanced treatment modalities in the non-operative and surgical care of hand, wrist, elbow and shoulder afflictions. His extensive clinical and surgical training will be available throughout our three MBO offices and hospitals.

Dr. Armbruster continues to contribute to advancing the science of orthopaedic care through writing scholarly articles and lecture presentations. He regularly lectures at national orthopaedic meetings.


Thomas Bills, MD, PhD

Thomas Bills, MD PhD

Thomas K. Bills, MD, PhD, is a board-certified orthopaedic surgeon, specializing in adult reconstructive surgery and general orthopaedics. Dr. Bills is one of the founders of Mercer Bucks Orthopaedics.

Dr. Bills grew up in Trenton, NJ and earned his bachelor's degree in biology from Syracuse University in 1972. He then moved to Thomas Jefferson University in Philadelphia to complete a PhD in Pharmacology in 1977 and an MD in 1980 from Jefferson Medical College. He received advanced training in Pediatric Orthopedics at Children's Hospital in Philadelphia; Trauma at Robert Wood Johnson Trauma Center; Joint Replacement at the Hospital for Special Surgery; Osteoporosis at Cornell Medical School and Bone Tumor at Memorial Sloan-Kettering Cancer Center in New York City.

Dr. Bills is an active staff member of Capital Health Systems and Robert Wood Johnson University Hospital. He is an associate staff member at St. Mary Medical Center in Langhorne, PA; active attending staff at Lawrence Rehabilitation Center in Lawrenceville, NJ; research staff as a visiting scientist at The Hospital for Special Surgery in the Department of Orthopaedic Research at Cornell Medical School in New York, NY; and consulting staff physician at the Metabolic Bone Disease Service and Osteoporosis Center in the Hospital for Special Surgery at Cornell Medical School in New York City.

Dr. Bills' professional work is supported by the multiple honors and awards he has earned, his membership in a variety of professional organizations, and an extensive bibliography and speaking engagement history.

Paul Codjoe, MD

Paul Codjoe, MD

Dr. Paul W. Codjoe, MD, joined Mercer-Bucks Orthopaedics after spending a year in private practice and another year in fellowship at the world renowned Hughston Clinic in Columbus, GA, where he specialized in arthroscopic surgery and minimally invasive joint reconstructive procedures of hips, knees and shoulders. Dr. Codjoe is board-certified by the American Academy of Orthopaedic Surgeons (AAOS).  He specializes in Sports Medicine and General Orthopaedics.

Dr. Codjoe was born in Accra, Ghana and came to the United States in 1989. He earned his bachelors degree from Rutgers University and subsequently attended Robert Wood Johnson Medical School. He finished his Internship in General Surgery and Orthopaedic Surgery residency at Temple University Hospital. During his training he has served as team physician for several high schools and a semi-professional hockey team. He has also given several presentations on various subjects and been an author of abstracts and articles within his medical speciality.

Dr. Codjoe is a member of several organizations includingthe  American Academy of Orthopaedic Surgeons( AAOS), American Orthopaedic Society for Sports Medicine (AOSSM), New Jersey Orthopaedic Society (NJOS) and Pennsylvania Orthopaedic Society (POS).


Frank Colarusso, DO

Frank Colarusso, DO

Dr. Frank Colarusso is a double Board-certified Physical Medicine and Rehabilitation physician via the AOA (American Osteopathic Association) and AMA (American Medical Association). He graduated cum laude in biology from nearby Rider University.

After earning his undergraduate degree, he attended the Philadelphia College of Osteopathic Medicine for medical school and completed his internship in the St. Barnabas Healthcare System. His residency training was in Physical Medicine and Rehabilitation, performed at Boston Medical Center, an affiliate of Boston University, where he served as chief resident.

Dr. Colarusso has been practicing Musculoskeletal and Sports Medicine for over twelve years with a focus on Electromyography, Osteopathic Manual Manipulations, Acute and Chronic Pain, Neck and Back Pain, Pain Management, Ultrasound Guided Diagnostics, Nerve Blocks and Injections.


Keith Crivello, MD

Keith Crivello, MD

Dr. Crivello is an orthopaedic surgeon with advanced specialty training in hand, upper extremity and microvascular surgery.

Dr. Crivello was born in New Brunswick, New Jersey and grew up on Long Island, New York. He attended the University of Pennsylvania in Philadelphia, receiving a B.A. in International Relations, with a minor in Chemistry. Prior to attending medical school he taught Chemistry at Cathedral High School in New York City. He graduated from Boston University School of Medicine where he was involved with scientific and clinical research with the Departments of General and Orthopaedic Surgery.

Dr. Crivello completed his internship and residency at St. Luke’s-Roosevelt Hospital Center in New York City. In addition to the time spent at St. Luke’s and Roosevelt Hospitals, where he received training from the esteemed CV Starr Hand Center, Dr. Crivello also served at Memorial Sloan Kettering for orthopaedic oncology and A.I. DuPont Hospital for Children for pediatric orthopaedic care. He continued to be involved with research during residency – with publications and presentations at national meetings – as well as book chapters and multimedia educational tools.

Dr. Crivello completed advanced fellowship training at the Hospital for Special Surgery in New York City in Hand, Upper Extremity and Microvascular Surgery. During that time he helped to care for players from the New York Mets, New York Giants, New Jersey Nets, as well as professional and Division I collegiate athletes from a number of different sports.


David Eingorn, MD

David Eingorn, MD

Dr. David S. Eingorn is a Board-Certified Orthopaedic Surgeon specializing in adult reconstructive surgery and general orthopaedics. He is one of the founders of our medical group.

Dr. Eingorn graduated with his bachelor’s degree in biology from LaSalle University in Philadelphia, and received his medical degree from the Temple University School of Medicine. His internship in surgery was carried out at the Presbyterian University of Pennsylvania’s Medical Center and was followed by his orthopaedic residency at Thomas Jefferson University Hospital.

Dr. Eingorn has received recognition as a "top doc " in our region and additonally holds a patent, the Universal Halo, which is used internationally for fractured spines. He also invented a hip jig for the DePuy Total Hip system.

His hospital staff appointments include active staff status at Capital Health Systems at Mercer and Fuld Campuses in Trenton, NJ, and Robert Wood Johnson University Hospital at Hamilton in Hamilton, NJ. He also serves as an associate staff member at St. Mary Medical Center in Langhorne, PA, a consultant for Lawrence Rehabilitation Center in Lawrenceville, New Jersey and a research consultant for Zimmer Orthopaedics Corporation.

Membership in a number of professional organizations and a variety of publications and research are all parts of Dr. Eingorn’s ongoing professional development and success. Dr. Eingorn's professional history spans a variety of experiences and responsibilities, including volunteer surgery duty during the 9/11/01 attacks of the World Trade Center in New York City.


Edward Ford, MD - RETIRED

Edward Ford, MD

Dr. Edward Ford, MD, is a Board Certified Orthopaedic Surgeon specializing in adult reconstructive surgery and general orthopaedics. He is one of the founders of MBO.

Another "hometown doctor " among our providers, he grew up in Lawrenceville and earned his bachelor's degree from the College of New Jersey in 1974. He continued his education at Newark's University of Medicine and Dentistry of New Jersey, graduating with his MD in 1980. Dr. Ford's orthopaedic residency training was completed at St. Joseph's Hospital and Medical Center in Paterson, NJ and Penn State Hershey Medical Center in Hershey, PA.

Dr. Ford's hospital staff appointments include active staff positions at Capital Health Systems at Mercer and Fuld Campuses in Trenton and at RWJ University Hospital in Hamilton, NJ; an associate staff position at St. Mary Medical Center in Langhorne, PA; and an active attending staff position at Lawrence Rehabilitation Center in Lawrenceville, NJ.


David Hardeski, MD

  David Hardeski, MD

Dr. Hardeski grew up in Bensalem, PA where he attended Bensalem High School. He graduated Summa Cum Laude with a B.A. in Anthropology from Temple University in 1999. He earned his Master’s degree in Medical Science while attending MCP Hahnemann University. Dr. Hardeski earned his medical degree from Drexel University College of Medicine and completed his residency training at Maimonides Medical Center in Boro Park, Brooklyn, NY. He completed his fellowship training at R Adams Cowley Shock Trauma Center in Baltimore, MD (regarded as one of the premier training centers for orthopaedic trauma in the world). He was active in clinical research throughout his training and has a number of publications, including a chapter on pediatric humerus fractures.

Dr. Hardeski played rugby all through college and for the Schuykill River Exiles. He is an avid fisherman and enjoys skiing, basketball, football, hockey, ping pong and baseball to name a few. Dr. Hardeski is excited about returning to Bucks County as an orthopaedic trauma surgeon to serve the area in which he grew up.


Fredric A. Kleinbart, MD

Fredric Kleinbart, MD

Dr. Fredric Kleinbart was the former Director of Sports Medicine and is currently an active staff member at Hahnemann University Hospital.  Additionally, he is an Associate Professor of Orthepaedic Surgery at Drexel University College of Medicine.  A graduate of the University of Pennsylvania School of Medicine, Dr. Kleinbart completed his residency training in Orthopaedic Surgery at Kingsbrook Jewish- Beth Israel Medical Centers and his Sports Medicine fellowship at Temple University Hospital.

Dr. Kleinbart’s USA Olympic experience includes serving as the orthopaedic surgeon at the San Diego Olympic training center, as a ringside physician for USA Boxing, and as a ringside physician for the Olympic boxing trials. He was the head Orthopaedic surgeon and co-team physician for Drexel University. He was also the Orthopaedic consultant for the American Repertory Ballet and the Princeton Ballet School and has a long history as team physician for various collegiate and high school teams. He has been instrumental in the creation of specialty sports clinics including the Arts Medicine Center, Women’s Sports Medicine and Pediatric Sports Medicine clinics at Hahnemann University hospital and the Drexel University College of Medicine.

Dr. Kleinbart established the Hahnemann University Hospital and Drexel Sports Medicine Arthroscopy lab and is an Associate Master instructor for various national arthroscopy courses. He lectures frequently on such varied topics as “The Weekend Warrior,” “The Female Athlete" and “Common Orthopaedic Injuries”. He has a special interest in shoulder and knee reconstruction and the Female Triad


John P. Nolan, Jr, MD

John Nolan, Jr, MD

Dr. John P. Nolan is an Orthopaedic Surgeon and is board-certified in Sports Medicine and General Orthopaedics. He is one of the founders of our medical group.

Dr. Nolan grew up in Huntington Valley, PA and attended LaSalle University in Philadelphia, receiving a degree in Biology. He earned his Doctorate of Medicine degree at Jefferson Medical College, Thomas Jefferson University, in Philadelphia, PA. He completed his residency in orthopaedic training at the Medical College of Pennsylvania and subsequently earned an academic appointment as a clinical instructor there. He acquired his specialty training in sports medicine at Temple University.

Dr. Nolan holds a patent for an arthroscopic laser hand instrument.  He was appointed clinical instructor at the orthopaedic division of Laser Centers of America in Kalamazoo, Michigan. He has served as an Orthopaedic Consultant for Pharmacia.  He has been a physician for several area school athletic teams. Dr. Nolan is currently the Director of orthopaedic trauma at St. Mary Medical Center and has served in the Executive Committee of Capital Health System.


Rikin J. Patel, DO

Rikin J. Patel, DO

Dr. Rikin Patel was born and raised in Toronto, Canada. He moved to the United States in 1992 and completed his secondary school education at the Mercersburg Academy in Pennsylvania.

After graduating from Cornell University, he attended the New York College of Medicine for medical school and went on to complete his residency training in Physical Medicine and Rehabilitation at NYU Medical Center in New York.

He joined MBO in 2008 after completing subspecialty training in Interventional Pain Management at Mount Sinai Hospital in Baltimore, MD and Orthopaedic & Spine Specialists in York, PA.  He is board certified in both PM&R with subspecialty board certification in both Sports Medicine and Pain Medicine.  Specializing in Non-operative Orthopaedic and Spine Care, he performs many interventional spine procedures including joint injections, epidurals, nerve blocks, discography, radiofrequency ablation, neuromodulation and other percutaneous prodedures.

He is trained in electrodiagnostics (EMG) and also treats musculoskeletal and sports related injuries; utilizing ultrasound to treat and diagnose common conditions.  He is also trained in performing plasma-rich protein injections and has special interest in biologics.


Rudolf Zak, DPM

  Rudolf Zak, DPM

Dr. Zak was born in Kiev, Ukraine and came to the United States in 1977. He grew up in Brooklyn, NY where he attended Midwood High School. He graduated with a B.S. in Athletic Training from Northeastern University in 1998. Dr. Zak earned his Medical degree from Temple University School of Podiatric Medicine and completed his residency training at Cooper University Hospital in Camden, NJ. He has been in private practice for 7 years in Marlton, NJ.

Dr. Zak is excited to join Mercer-Bucks Orthopaedics and will be seeing patients in all of our locations.


Michael Ast, MD

Michael Ast, MD

Dr. Ast is fellowship trained in Adult Reconstruction and Joint Replacement Surgery from the Hospital for Special Surgery in New York City. He grew up in Staten Island, New York, and attended Temple University, where he graduated Magna Cum Laude in Biology and Phi Beta Kappa. He completed his Medical Degree at Temple University School of Medicine and returned to New York for his residency training in orthopaedic surgery at North Shore-Long Island Jewish Medical Center.

Dr. Ast specializes in primary, complex and revision total joint replacement. His specialty training includes minimally invasive hip and knee replacement, partial knee replacement, direct anterior total hip replacement, hip resurfacing, robotic surgery and computer assisted surgery. His specialty training also includes the treatment of painful, failed or infected joint replacements. Dr. Ast has extensive experience with and has published research on patient-specific instruments and implants. During his studies, he published numerous articles and chapters in peer-reviewed journals and internationally distributed textbooks, including several chapters on “Approaches for hip replacement surgery”. He has also presented clinical and basic science research both nationally and internationally.

Dr. Ast was a Division I gymnast at Temple University and captain of the conference champions and top ten nationally ranked team in 2003. He is married and enjoys his time playing tennis, golf, fishing, skiing and traveling.


Stephen Cairone, DO

Stephen Cairone, DO

Dr. Cairone joins Mercer-Bucks Orthopedics after 9 years in private practice in Bucks County. He is board-certified in Orthopedic surgery and received fellowship training in spine surgery from the University of Pennsylvania.

Dr. Cairone was born is Horsham. PA and attended Hatboro-Horsham High school, where he was recently inducted into the Hall of Fame. He then went on to Lycoming College, where he majored in Biology and minored in Psychology. He earned Academic All American honors as a four year starter in soccer and was selected all Middle Atlantic Conference in his senior year.

He then spent the next nine years at the Philadelphia College of Osteopathic Medicine where he attended medical school, internship and orthopedic surgical residency. He presently serves as an Associate Professor of Orthopedic Surgery at PCOM.

Over the last 10 years Dr. Cairone has served in several capacities for the American Osteopathic Association of Orthopedic Surgeons (AOAO). He has served as the Vice- President and President of the spine sub section as well as giving several lectures each year. This work culminated in Dr. Cairone being inducted as a Fellow of the AOAO in 2012.

Dr. Cairone’s main area of orthopedic interest is minimally invasive lumbar fusion surgery, the surgical treatment of herniated discs, cervical disc replacement surgery, fracture surgery, and arthroscopy.

Dr. Cairone lives in Wrightstown, PA with his wife and 3 daughters. He serves on the board for Council Rock United Soccer Association and is also been appointed as the director of injury prevention. He also coaches two teams for the soccer club.

In addition, Dr. Cairone is a professional fishing boat captain. He gained his OUPV license in 2003 and frequently travels 90 miles offshore looking for tuna, marlin and sharks.


Gautam Kothari, DO

Gautam Kothari, DO

Dr. Gautam Kothari, DO grew up in northern New Jersey where his family still resides. He was accepted into an accelerated 7 year medical program directly from high school. He completed his undergraduate studies in 3 years at the New York Institute of Technology and then went on for his medical schooling at the New York College of Osteopathic Medicine.

After completing his residency training in Physical Medicine and Rehabilitation at Nassau University Medical Center, where he served as chief resident in his final year, Dr. Kothari went on to do additional fellowship training in Interventional Spine Care and Sports Medicine at Orthopedic and Spine Specialists in York, PA under Michael Furman, M.D., an international figure in the field.

Prior to joining MBO, Dr. Kothari was a Clinical Instructor for the Department of PM&R at Thomas Jefferson University in Philadelphia, PA. In addition to his clinical duties, he was involved with training medical students and residents. He was nominated for title of Associate Clinical Professor prior to his departure. Dr. Kothari is a published author and has a variety of publications, including most recently a “Pocket Handbook of Spinal Injections” which is used as a quick reference for doctors in training.

Dr. Kothari has a special interest in spinal disorders and musculoskeletal injuries and also performs a variety of fluoroscopically guided procedures including epidural steroid injections, nerve blocks, joint injections as well as radiofrequency ablation.

In his spare time, he enjoys staying active and spending time with friends and family.


Thomas Capotosta, MD

Thomas Capotosta, MD

Dr. Capotosta is a highly experienced and respected orthopedic surgeon who has served the Mercer community for over 39 years. In addition to general orthopedics, Dr. Capotosta specializes in total joint replacements.

After graduating with a B.S. in Biology from Georgetown University, Washington D.C. , Dr. Capotosta earned his medical degree from the University of Santiago de Compostela, Spain. He continued his education completing a straight surgical internship and one year surgical junior residency at the Hospital for Joint Diseases in New York, NY. His orthopedic residency was done at the University of Medicine and Dentistry of New Jersey in Newark N.J. Dr. Capotosta is a member of the New Jersey Medical Society, Mercer County Medical Society and the New Jersey Orthopedic Society.

Having lived five years in Spain and with a Cuban wife, Dr. Capotosta is perfectly fluent in Spanish. He is an avid golfer and enjoys spending time with his large family and many friends.


Donald Polakoff, MD

Donald Polakoff, MD

Donald R. Polakoff, MD is pleased to announce his association with Mercer-Bucks Orthopaedics. Dr. Polakoff has maintained an orthopaedic practice emphasizing excellence in patient care and surgical outcomes, teaching, clinical innovation and research, serving the central New Jersey community since 1985.

Dr. Polakoff has performed thousands of hip and knee replacements with superlative outcomes and patient satisfaction, enduring over many years of clinical follow-up.

He has played a significant role in the development of numerous innovative techniques for treatment of the arthritic hip and knee. He is a designing surgeon for a minimally-invasive partial knee replacement, and served as a specially trained “limited release” surgeon during the development of cementless total hips, hip resurfacing, and patient-specific knee and hip replacements. He has been a Principal Investigator for important clinical studies, including an FDA multi-center study evaluating biologic ingrowth in cementless total hips, an FDA multi-center study evaluating the efficacy of joint lubrication injections for the non-operative treatment of osteoarthritis, and a multi-centered study evaluating the long-term outcomes of a total knee utilizing advanced materials, designed for increased longevity.

Dr. Polakoff holds an appointment as Clinical Associate Professor in the Department of Orthopaedic Surgery at Rutgers-Robert Wood Johnson Medical School. He is a core member of the academic faculty, and has trained over one hundred Orthopaedic Surgery residents in the art and science of joint replacement surgery and patient care. He is an Attending Surgeon at Robert Wood Johnson University Hospital and St. Peters University Hospital, New Brunswick NJ, and the University Medical Center of Princeton at Plainsboro NJ.

Dr. Polakoff serves as an Examiner for the board certification examinations of the American Board of Orthopaedic Surgery. He is also a Consulting Reviewer for the Journal of Bone and Joint Surgery and for the Journal of Arthroplasty. His professional associations include the American Academy of Orthopaedic Surgeons, the American Association of Hip and Knee Surgeons, and the Society for Arthritic Joint Surgery.

Dr. Polakoff graduated from Cornell University with Distinction in All Subjects, and was elected Phi Beta Kappa. He received his M.D. degree at Weill Cornell Medical College, New York. His Orthopaedic Surgery residency was completed at the University of Texas Southwestern Medical Center - Parkland Memorial Hospital, Dallas, Texas. Dr. Polakoff was selected for a post-residency fellowship in joint replacement and arthritis surgery at Harvard Medical School-Brigham and Women’s Hospital, Boston, Massachusetts.

Commitment to Serving Our Community

The founders of MBO came back to serve their community. This original principle has never been compromised. We provide our patients unparalleled accessibility to orthopaedic specialists, without long delays. We have a solid reputation for being approachable and compassionate. We really care about what's best for our patients. We also participate in two free clinics in two different hospitals every week for patients without insurance. We believe that our patients are an extension of our own families, so we treat them with the utmost respect and attentiveness.

For more information about our practice, please visit our website at