While in residency at the University of Kansas Hospital, Dr. Althaus was able to acquire a broad knowledge of the surgical and non-surgical management of many orthopaedic conditions. This is demonstrated by his performance on standardized exams during training including scoring in the 99th percentile on the Orthopaedic In-Training Exam and the 96th percentile on the written portion of the Orthopaedic Board Exam.

He completed a fellowship with the Insall Scott Kelly Institute for Orthopaedics and Sports Medicine at the NYU Hospital for Joint Diseases in New York City where he learned state-of-the-art techniques for the management of injuries and arthritic conditions involving the hip, knee, and shoulder. At ISK, he worked with some of the best knee surgeons in the country and was exposed to the philosophy and legacy of Dr. John Insall, who is regarded as the father of knee replacement surgery. During this fellowship, he received additional training in shoulder reconstruction, rotator cuff, and labral surgery as well as hip arthroscopy for the treatment of labral tears and hip impingement. He has experience with all of the common approaches to the hip including the direct anterior, lateral, and posterior.

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Dr. Anand values ongoing education and remains connected to his professional organizations and peers by serving as an active reviewer for a number of Orthopaedic Journals. As a member of the American Academy of Orthopedic Surgeons, American Orthopedic Society for Sports Medicine and the American Orthopedic Foot and Ankle Society, Dr. Anand remains in touch with current best practices and actively utilizes these resources to serve his patients.

He believes firmly in evidence based medicine and provides honest professional opinions informed by his vast experience and commitment to a thorough approach to evaluation, diagnosis and treatment.

During his fellowship, Dr. Anand published several peer reviewed articles and also presented his research at the Arthroscopy Association of North America annual meeting. His fellowship also provided him the opportunity to serve as assistant team physician for the Baltimore Ravens football team and the Washington Nationals baseball team.

Beginning his practice in 2012 in Illinois, Dr. Anand was the sole orthopaedic surgeon in the area and has seen, treated and evaluated thousands of non-operative and surgical patients.

Dr. Anand’s current medical involvement:

• AOFAS Program Committee Member(2020-2022)
• Associate Editor of EJOST Journal(2021-present)
• Editor in Chief of Statpearl’s Orthopedic specialty(2020-present)
• Editorial Board of Arthroscopy Journal (2021-present)

Dr. Anand is married, has two children, loves to travel, and plays tennis and cricket.

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Dr. Bissell completed his residency in orthopaedic surgery at the University of Vermont in Burlington, VT, where he also served as chief resident for one year. In 2010, he completed an orthopaedic sports medicine/shoulder fellowship at the University of Michigan in Ann Arbor, MI. This fellowship included hip, shoulder, and knee arthroscopy.

Prior to joining CNOS, Dr. Bissell worked with various athletic teams and at sporting events to treat injured athletes, including the University of Michigan, Eastern Michigan University, the University of Vermont, the Sugarbush Ski Injury Clinic and the Big 10 Wrestling Tournament. Dr. Bissell serves regional athletic teams including Wayne State University, Briar Cliff University, and multiple area high schools. He enjoys outdoor activities like biking, camping, hunting, fishing and snowboarding with his wife and four children.

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Dr. Carreau joined CNOS in 2016 after completing his fellowship in Orthopaedic Sports Medicine at the University of Iowa. He is originally from Colorado where he attended Colorado State University for his undergraduate education. Thereafter, he pursued medical school at Creighton University in Omaha, Nebraska, and in 2009 traveled to San Diego to complete his orthopaedic surgery residency at the University of California, San Diego. There he received extensive training in adult and pediatric trauma and joint replacement surgery. He developed a special interest in advanced arthroscopy and the treatment of athletic injuries, thus chose to pursue fellowship training in Sports Medicine through the University of Iowa.

At the University of Iowa, Dr. Carreau was trained by national leaders in the practice of advanced arthroscopic techniques, cartilage transplantation, shoulder instability, patellofemoral problems, ligamentous injury of the knee and shoulder replacement surgery. He also received extensive training in the treatment of all athletes at the University of Iowa and was assistant team physician to the Hawkeye Football Team during their historic 2015 season.

He currently serves as Orthopaedic team physician to the Wayne State Wildcats and assists with multiple local high schools. Dr. Carreau has published papers on various orthopaedic topics and is a member of the American Academy of Orthopaedic Surgery, the American Orthopaedic Society for Sports Medicine and the Arthroscopy Association of North America. Dr. Carreau is an avid fisherman and enjoys the outdoors and sending time with his wife and children.

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Dr. Case received his medical degree from the University of Illinois College of Medicine in Chicago. His board certifications include Neurology, Sleep Medicine (ABPN, ABSM), Clinical Neurophysiology (APBN) (EEG, Electroencephalography, Electromyography, Evoked Potentials), and Electrodiagnostic Medicine (ABEM). He also holds qualification in neurovascular ultrasound (carotid duplex and transcranial Doppler monitoring) from the American Society of Neuroimaging.

Dr. Case serves as the Medical Director of Neurodiagnostics and Sleep Disorders Laboratory at UnityPoint Health – St. Luke’s. He performs a monthly Neurology and EMG outreach clinic at Sioux Center Community Hospital.

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Dr. Justin Deans is a board certified orthopaedic surgeon specializing in adult reconstruction and  joint replacement surgeries.

Dr. Deans earned his Bachelor’s degree at the University of Minnesota, Twin Cities, and his medical degree at the Touro University Nevada in Henderson, NV. He completed his Orthopaedic Surgery Internship at Larkin Community Hospital, South Miami, FL, and his residency at Doctors Medical Center in Modesto, CA. Dr. Deans completed his Adult Reconstruction Fellowship at Lenox Hill Hospital in New York City and is licensed in Iowa, Nebraska, and South Dakota.

Dr. Deans is married and some of his hobbies include boating fishing and golfing. He and his wife are happy to return back to the Midwest!

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She earned her Bachelor’s Degree in Biology from the University of St. Thomas in St. Paul, MN, and her medical degree from the University of South Dakota Sanford School of Medicine. Dr. Delaney-Nelson completed her internal medicine residency at the Gundersen Health System in La Crosse, WI, where she also served as Chief Resident for one year. In 2020, Dr. Delaney-Nelson completed her Rheumatology Fellowship from the University of Missouri. Prior to joining CNOS, Dr. Delaney-Nelson was a Hospitalist for the Gundersen Health System.

Dr. Delaney-Nelson grew up in North Sioux City, SD, on McCook Lake. She enjoys boating, fishing, watching sports, and spending time with her husband and daughter.

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Dr. Diaz-Aguilar joined CNOS in 2025 after completing his neurosurgery residency at the University of California, Los Angeles (UCLA), where he received comprehensive training in cranial and spinal surgery, trauma, neuro-oncology, and complex spinal disorders. He is originally from San Diego, California, and earned his undergraduate degree in Neuroscience from Johns Hopkins University. He later returned to California to pursue his medical degree at the David Geffen School of Medicine at UCLA.

Throughout his training, Dr. Diaz-Aguilar developed a particular focus on spine surgery, including degenerative spine disease, spinal deformity, and peripheral nerve disorders. During residency, he was active in surgical innovation, patient-centered care initiatives, and teaching medical students and junior residents. He was also a contributing author on research exploring outcomes in minimally invasive and outpatient spine surgery.

He is excited to bring his expertise to the Siouxland community and believes in a multidisciplinary, evidence-based approach to spine care. Dr. Diaz-Aguilar is a member of the Congress of Neurological Surgeons and the North American Spine Society. Outside of work, he enjoys spending time with his wife and four young children, writing, and exploring the outdoors.

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