Orthopaedic Surgical Associates

04/24/2026

Here is an example of the expertise and care that makes Orthopaedic Surgical Associates stand out.

Dr. Steven DiSegna is a fellowship-trained orthopedic surgeon who specializes in the diagnosis and treatment of hip and knee arthritis, general joint pain and problems with prior joint replacements. He regularly performs primary and revision hip and knee replacements, partial knee replacements, minimally invasive anterior approach total hip replacement, robotic surgery and outpatient total joint replacements.

Learn more about Dr. DeSegna: https://ow.ly/eyOP50YO8by

04/17/2026

Here is an example of the expertise and care that makes Orthopaedic Surgical Associates stand out.

Dr. Mark Lapp is a fellowship-trained orthopedic spine surgeon. Dr. Lapp has a broad background in caring for non-operative and surgical spinal disorders in adults and children. His areas of expertise include complex spinal reconstructive procedures, revision surgery, cervical, thoracic, and lumbar spine surgery, and minimally invasive spine procedures.

Learn more about Dr. Lapp: https://orthsurg.com/physicians/mark-a-lapp/

Dr. Mark Lapp is a board-certified, fellowship-trained orthopedic spine surgeon at Orthopaedic Surgical Associates. Dr. Lapp’s practice covers the breadth of orthopedic spine surgery. His areas of expertise include complex spinal reconstructive procedures, revision surgery, cervical, thoracic, and...

04/08/2026

Here is an example of the expertise and care that makes Orthopaedic Surgical Associates stand out.

Dr. Thomas Herron is a fellowship-trained orthopedic surgeon specializing in sports medicine. He provides comprehensive care to patients of all ages and athletic backgrounds, with expertise in advanced arthroscopic techniques of the knee, shoulder and hip. Dr. Herron also performs hip, knee, and shoulder replacements.

Learn more about Dr. Herron: https://ow.ly/SEvf50YEzE7

About Thomas Herron, DO, is a fellowship-trained orthopedic surgeon and sports medicine specialist at Orthopaedic Surgical Associates. He provides comprehensive care to patients of all ages and athletic backgrounds, specializing in advanced arthroscopic techniques of the knee, shoulder and hip. Dr.....

04/01/2026

This National Occupational Therapy Month, we recognize the vital role occupational therapy plays in helping patients regain independence and return the activities they love. Join us in celebrating Christopher Telep, OTR/L, CHT, registered and licensed occupational therapist and certified hand therapist at OSA!

03/30/2026

On this National Doctors’ Day, we are proud to celebrate the incredible group of physicians who are committed to providing compassionate, best in class care to our patients. Join us in thanking our doctors for the impact they have on our community every day!

03/19/2026

Getting the right diagnosis is now easier than ever. OSA uses advanced MRI technology to deliver more precise images with shorter scan times, so you spend less time in the scanner and get a clearer picture of your condition. Learn more about MRI services at OSA: https://ow.ly/QoGS50YvMXj

03/06/2026

On Employee Appreciation Day, we are sharing our gratitude for our team members across OSA whose dedication, compassion and expertise make exceptional care possible every day.

02/27/2026

While conditions like carpal tunnel syndrome, trigger finger, and tennis elbow are common, there are many misconceptions about causes and treatments that can delay recovery. Dr. Steven Alter, hand and upper extremity surgeon at OSA, shares the truth behind five common myths about repetitive strain injuries: https://ow.ly/E7Ok50YmZOa.

Repetitive strain injuries (RSIs) such as carpal tunnel syndrome, trigger finger, and tennis elbow are some of the most commonly treated orthopedic conditions, and are also commonly misunderstood. RSIs affect office workers, athletes, musicians, healthcare professionals, and anyone whose dail...

02/24/2026

Here is an example of the expertise and care that makes Orthopaedic Surgical Associates stand out.

Dr. Howard Wu is a fellowship-trained orthopedic surgeon specializing in sports medicine, trauma, and joint reconstruction and replacement of the shoulder, knee, and hip. He has expertise in advanced, minimally invasive arthroscopic techniques, and treats arthritis, general orthopedic injuries, and all injuries related to sports medicine.

Learn more about Dr. Wu: https://orthsurg.com/physicians/howard-wu/

Dr. Wu is board certified by the American Board of Orthopaedic Surgery and specializes in sports medicine, trauma, and minimally invasive surgeries of the shoulder and knee. He also cares for patients with general orthopedic injuries and arthritis. Dr. Wu has extensive experience with joint reconstr...

02/22/2026

Due to inclement weather, all offices will be closed on Monday, February 23.

02/13/2026

OSA and Therafit offices will be closed on Monday, 2/16 in observance of Presidents’ Day. Chelmsford imaging will be open.

02/11/2026

Here is an example of the expertise and care that makes Orthopaedic Surgical Associates stand out.

Dr. Jeremy Moses is a fellowship-trained orthopedic surgeon specializing in sports medicine. He cares for patients of all ages and athletic backgrounds. Dr. Moses has expertise in advanced arthroscopic techniques of the knee and shoulder and treats a breadth of orthopedic injuries and conditions to get patients back to their active lifestyles.

Learn more about Dr. Moses: https://orthsurg.com/physicians/jeremy-m-moses/

Jeremy Moses, MD, is fellowship-trained orthopedic surgeon and sports medicine specialist at Orthopaedic Surgical Associates. He takes care of patients of all ages and athletic backgrounds. Dr. Moses specializes in advanced arthroscopic techniques of the knee and shoulder and treats a breadth of ort...