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Orthopaedic Surgery, Sports Medicine | More

Assistant Professor of Orthopaedic Surgery and Rehabilitation Medicine

UChicago Faculty Physicians hold faculty positions with the University of Chicago and provide care for patients on the academic health system’s main campus in Hyde Park and in care centers throughout the Chicago region.


Nicholas Maassen, MD, is an expert orthopaedic surgeon who specializes in elbow and shoulder injuries. Dr. Maassen’s primary focus is treating patients suffering from soft tissue (muscle, tendon and ligament) injuries, shoulder/elbow arthritis, and fractures in the upper extremity.

Dr. Maassen combines his clinical expertise with on-going investigative research efforts in the hopes of pioneering techniques and therapies that improve care for patients with complex orthopaedic disorders and injuries. Currently, Dr. Maassen is evaluating repair techniques for rotator cuff tears and shoulder instability so he can offer a wide range of quality treatment options. He has also been published in a number of highly respected journals, including the Journal of Shoulder and Elbow Surgery, Arthroscopy, Journal of Orthopaedic Trauma and Journal of Bone and Joint Surgery.

Areas of Expertise

  • Shoulder Injuries
  • Elbow Surgery
  • Arthritis

Medical Education

  • University of Wisconsin School of Medicine and Public Health


  • University of Wisconsin Hospital and Clinics


  • University of Wisconsin Hospital and Clinics


  • Beth Israel Deaconess Medical Center

Memberships & Medical Societies

  • Mid-America Orthopaedic Association
  • American Shoulder and Elbow Surgeons
  • American Association of Orthopaedic Surgery
  • Aetna HMO (specialists only)
  • Aetna POS
  • Aetna PPO
  • BCBS Blue Precision HMO (specialists only)
  • BCBS HMO (HMOI) (specialists only)
  • Cigna HMO
  • Cigna POS
  • Cigna PPO
  • CountyCare *see insurance page
  • Aetna Better Health *see insurance page
  • Medicare
  • Multiplan PPO
  • United Choice Plus POS/PPO
  • United Options (PPO)
  • United Select (HMO & EPO) (specialists only)
  • United W500 Emergent Wrap
  • Aetna Medicare Advantage HMO & PPO
  • BCBS Medicare Advantage HMO & PPO
  • Humana Medicare Advantage Choice PPO
  • Humana Medicare Advantage Gold Choice PFFS
  • Humana Medicare Advantage Gold Plus HMO
  • United Choice HMO (specialists only)
  • University of Chicago Health Plan (UCHP)
To Request an Appointment

Duchossois Center for Advanced Medicine (DCAM) - Hyde Park

Request an Appointment at Duchossois Center for Advanced Medicine (DCAM) - Hyde Park

UChicago Medicine Orland Park

Request an Appointment at UChicago Medicine Orland Park

To Refer a Patient

Refer a Patient

At a Glance

Practicing Since2014

Board Certifications

  • Orthopaedic Surgery

Languages Spoken

  • English