Our Team

Paul Ghattas, DO

Orthopedic Surgery
Dr. Paul Ghattas is a fellowship-trained orthopedic surgeon who specializes in arthroscopic procedures of the shoulder, elbow, and knee.

He has been in practice in the Dallas, Texas area since 2016, and is the director of shoulder and elbow surgery at Star Orthopedics and Sports Medicine. Dr. Ghattas is widely considered as an expert in reconstructive and arthroscopic surgery of the upper extremity.

Dr. Ghattas completed his medical school at Nova Southeastern University in Ft. Lauderdale, Florida. He then completed his orthopedic surgery training in Tennessee at the Wellmont/Lincoln Memorial University Orthopedic Residency Program. During his residency he trained at multiple nationally recognized institutions including: Cincinnati Children’s Hospital, the Hughston Clinic, and the University of South Florida. After residency, Dr. Ghattas completed a subspecialty fellowship at the prestigious WB Memorial Carrell Clinic here in Dallas, Texas. Dr. Ghattas has published numerous book chapters and scientific papers in peer‐reviewed journals including The American Journal of Orthopedics (AJO), Reconstructive Review, and Orthopedic Journal of Sports Medicine (OJSM). Most recently he has published book chapters on the Latarjet Procedure, History of Reverse Total shoulder, and the Superior Approach to the Shoulder.

His research has been presented at numerous regional and national conferences, including the AOAO annual meeting, and Tennessee Orthopedic Society. During his training Dr. Ghattas has served as an ancillary sports medicine physician for the SMU Mustangs and the Dallas Mavericks. He has received a number of prestigious awards and honors, including Sigma Sigma Phi National Honor Society, and the Cecil B. Hall Academic Scholar Award.

Alexander Glogau, MD

Orthopedic Surgery
Dr. Glogau is a graduate of Downstate Medical Center/State University of New York at Brooklyn and holds additional degrees from John Hopkins University and City University.

He completed his surgical residency at Maimonides Medical Center in Brooklyn, where he also served as chief resident in the final year of the program. Dr. Glogau is a board-certified and fellowship trained orthopedic surgeon who specializes in sports medicine and the arthroscopic and reconstructive surgery of the knee and shoulder with a Certificate of Added Qualification in Sports Medicine. Dr. Glogau has been the co-director of the Plano/Associated Orthopedic Sports Medicine Fellowship since 1990. In addition, he has chaired the Department of Orthopedics at Presbyterian Hospital of Plano as well as Medical Center of Plano.

He presently serves as an adjunct assistant professor of the Department of Physician Assistant Studies at the University of Texas Southwestern Medical Center and on the Executive Board. He is the official team physician for the Texas Legends professional basketball team in Frisco, Texas, Plano Senior High School and John Paul II High School.

Sean Haslam, MD

Orthopedic Surgery
Sean Haslam, MD, FRCSC is a fellowship trained orthopedic surgeon specializing in sports medicine and joint replacement.

His particular interests include knee injuries, arthritis, ACL injuries and rotator cuff tears. Dr. Haslam received his medical degree from the University of Calgary, Calgary, Alberta and completed his orthopedic residency at Queens University, Kingston, Ontario. He serves as team physician for Lone Star High School in Frisco, Texas.

Dr. Haslam serves as Department Chair for Orthopedics and Neurosurgery at Centennial Medical Center in Frisco, Texas. Dr. Haslam is a member of the American Academy of Orthopaedic Surgeons, American Orthopaedic Society for Sports Medicine, and the Texas Orthopaedic Association. He is certified by the Royal College of Physicians and Surgeons of Canada. Outside of work, Dr. Haslam enjoys spending time with his wife and six children. He enjoys football, soccer and mastering his pit barbecue skills.

Michael Khair, MD

Orthopedic Surgery
Michael Khair, MD received his medical degree from Thomas Jefferson University in Philadelphia, PA.

Full Biography
Orthopedic surgeons specialize in all aspects of musculoskeletal care. Dr. Khair received additional training in Orthopedic Sports Medicine. His practice focuses on: arthroscopic surgery of the shoulder, hip and knee, sports injuries, cartilage restoration, open shoulder surgery, shoulder replacement and trauma.

William Montgomery, MD

Orthopedic Surgery
Dr. William Montgomery is certified by the American Board of Orthopedic Surgeons.

He limits his practice to hip replacements, total knee replacements and partial knee replacements. Dr. Montgomery has been in the community for 20 years and has performed a large volume of hip and knee replacements. He believes in treating the patient as a whole and bases his practice on a personal relationship with his patient throughout the surgical process. You will routinely see him at office visits and on rounds in the hospital.

Dr. Montgomery believes that treating arthritis is a planned process and he will spend time talking with you, discussing what plan meets your needs and expectations. Dr. Montgomery will discuss if you are a candidate for a partial or total knee replacement. He also offers hip surgery using the anterior supine approach.

Dr. Montgomery grew up in Caldwell ,TX. He is married and has two sons. He enjoys raising cattle and working on the land.

Mark Muller, MD

Orthopedic Surgery
Mark Muller, MD, joined the Carrell Clinic™ in 2008 as a board-certified orthopedic surgeon with expertise in sports related injuries of the knee, hip, and shoulder.

He serves as a team physician for the Dallas Cowboys. He has previously served as the head team physician for the Dallas Stars.

As the son of an Air Force pilot and physician, Dr. Muller grew up in a number of diverse places from Alaska to Texas. His family finally settled in Austin, Texas where he attended high school and they remain in the Texas hill country today. He graduated Magna Cum Laude from Wake Forest University in North Carolina and returned home to Texas for medical training at the University of Texas Southwestern Medical School in Dallas. He remained in Dallas for a general surgery internship at Parkland Hospital prior to entering active duty in the Air Force as a flight surgeon. Dr. Muller served in the USAF Special Operations Command and was stationed at Hurlburt Field Air Force Base in Florida. During his time with this unit, Dr. Muller commanded the medical operations on multiple clandestine deployments, including trips to the Middle East, South America, and Korea. He supported one of the country’s most elite combat search and rescue squadrons and served as the unit’s leader in the medical response to chemical and biologic weapons.

Dr. Muller returned to Dallas for orthopedic surgery residency at UT Southwestern Medical Center. He received multiple distinctions for his academic and clinical performance during his orthopedic surgical training. After completing his residency, he returned to the Air Force and was stationed at Travis Air Force Base in California. He served two years as a military orthopedic surgeon in California. His assignment included a 5 month deployment to provide medical support for Operation Iraqi Freedom and Operation Enduring Freedom in Qatar and Kuwait.

After resigning his commission from the military, Dr. Muller was selected for the prestigious Sports Medicine and Shoulder Surgery Fellowship at Cornell University’s Hospital for Special Surgery in New York City. During his fellowship, Hospital for Special Surgery was selected by US News and World Report as the premiere orthopedic institution in the country. Dr. Muller trained with world-renowned experts in sports medicine and gained expertise in the latest techniques in knee, hip, shoulder, elbow, and ankle arthroscopy. His responsibilities included orthopedic coverage for the New York Giants during the Super Bowl Championship 2007-2008 season. He provided sideline coverage the entire season, including the NFC Championship Game at Lambeau Field and Super Bowl XLII in Arizona. Dr. Muller’s research included knee ligament biomechanical studies and clinical evaluation of lower extremity tendon injuries. He has published in multiple journals and presented at many local and national meetings, including the annual NFL Team Physician Society Meeting and the annual NHL Team Physician Society Meeting.

Dr. Muller is board-certified in orthopedic surgery and subspecialty certified in sports medicine by the American Board of Orthopedic Surgery. He is an active member of many professional organizations including the American Academy of Orthopedic Surgeons, the American Orthopedic Society for Sports Medicine, and the Texas Medical Association. In addition, he serves as an associate master instructor in hip arthroscopy for the Arthroscopy Association of North America.

Dr Muller enjoys spending his rare free time with his wife and two daughters.

Khalid Yousuf, MD

Orthopedic Surgery
Khalid Yousuf, MD, MS joins us from his busy practice in Chicago, IL. He is a native of Texas and has moved back to be with his family.

Dr. Yousuf’s practice focuses on hip and knee replacements. He utilizes surgical and technological advancements to offer his patients relief from joint pain, including partial knee replacements and anterior hip approach. He received advanced training in joint replacement surgery at the Mayo Clinic in Rochester, MN. Dr. Yousuf attended medical school at Louisiana State University in New Orleans and completed his orthopedic residency at the University of Oklahoma. He is board certified and recently achieved the distinction of being a Certified Physician Executive, by the American Association of Physician Leaders. In 2016, he was presented the Healing Hands award by the Little Company of Mary Hospital in Chicago, IL.

Dr. Yousuf is actively involved in teaching residents and medical students and has participated as an instructor for the American Academy of Orthopedic Surgery Residents course in Arthroplasty. He is a Fellow of the American Association of Hip and Knee Surgeons and certified to perform Robotic joint replacements.

Dr. Yousuf enjoys spending time with his wife and three daughters. They love cooking, traveling and swimming together. He is an avid car enthusiast. In his younger years, he used to quarter mile race his Camaro Z28 and Trans Am. He now rarely goes over the speed limit!