About Masi Clinic
Orthopedics with a Regenerative Edge
At Masi Clinic, healing begins with a personalized, whole-person approach that goes beyond traditional orthopedics. While Dr. Masi Reynolds and his team are highly skilled in advanced joint replacement procedures—including knee, shoulder, and total hip replacements—they are equally committed to preserving the integrity of the natural joint whenever possible.
For conditions such as shoulder pain, knee pain, hip arthritis, and sports-related injuries, the clinic offers leading-edge joint preservation therapies, including hyaluronic acid injections and osteochondral autograft transplantation surgery (OATS). The practice also integrates regenerative solutions like PRP, stem cells, peptides, and anti-inflammatory protocols to accelerate healing at the cellular level.
Masi Clinic blends top-tier surgical expertise with a regenerative mindset—focusing on recovery, performance, and long-term optimization. From meniscus and ACL injuries to rotator cuff repairs, patients are met with a clear treatment plan and collaborative care model that values their goals and lifestyle.
With onsite imaging (X-rays and MRIs), same-day appointments, and a fully equipped surgical center offering minimally invasive and robotic-assisted procedures, Masi Clinic makes world-class orthopedic and regenerative care both accessible and efficient—empowering patients to move forward with strength, resilience, and confidence.
Our Values
At the heart of the Masi Clinic are three core values: Compassion for People, Commitment to Excellence, and Empowered Collaboration. We treat every individual—patients and team members alike—with dignity, care, a sense of family, and a genuine desire to support their well-being. We uphold the highest standards of care through a transparent, quality-driven process that builds trust and delivers consistent results. And we believe in empowering patients through education, ensuring they are informed, involved, and aligned every step of the way for better outcomes and lasting impact.
Our Team
Masi Reynolds, DO
Orthopedic Surgeon, Sports Medicine, Founder of MASI Clinic
Dr. Masi Reynolds is an orthopedic surgeon and sports medicine physician, and the founder of Masi Clinic. He is fellowship-trained in sports medicine and advanced arthroscopy, having a special interest in treating the active population, including athletes at all levels, and volunteer orthoaedic surgery mission work in underserved countries. Born and raised outside of Seattle, Washington, Dr. Reynolds attended Oregon State University on a baseball scholarship, where his initial interest in orthopedic surgery and sports medicine was cultivated. Learn more
April Mancuso, DO
Director of Wellness
Dr. April Mancuso, DO is a board-certified physician and the Director of Wellness at MASI Clinic, an orthopedic and regenerative medicine practice. She earned her medical degree from Touro University California, completed her internship at Henry Ford Macomb Hospital, and completed her Physical Medicine and Rehabilitation residency at the University of Toledo. Certified through Koniver Wellness, A4M, and the International Peptide Society, and trained in Ozone Therapy under Dr. Frank Shallenberger, Dr. Mancuso blends medical expertise with modern wellness to support recovery, vitality, and longevity. A devoted mom of three and wife of over 15 years to Dr. Kerisimasi Reynolds, she brings both compassion and precision to her leadership at MASI Clinic. Learn more
Janice Cooper RN,
MSN, NP-C
Nurse Practioner
Janice is an AANP board certified Nurse Practitioner, having received her undergraduate degree from UC Berkeley and Masters in Nursing from Samuel Merritt College in Oakland, and starting her career at the University of California San Francisco Medical Center in the neurosurgery spine department. Janice has extensive experience with the pre and post-operative support care of patients undergoing shoulder, knee, hip, elbow, and hand surgeries, and is also skilled in therapeutic injections of the shoulders, knees, and hands. Learn more
Jonathan Davies, PA-C
Physician Assistant
Jonathan Davies, PA-C, is a nationally certified Physician Assistant specializing in orthopedic care, injury prevention, and wellness-focused medicine. With a strong foundation in both clinical expertise and patient-centered care, Jonathan is passionate about helping individuals move better, feel stronger, and regain control of their health. Learn more
Becca Lopez
Director of Operations
Born and raised in San Jose, California, Becca Lopez is a dedicated and dynamic leader with a deep-rooted passion for connection, communication, and personal growth. She currently serves as the Director of Operations at MASI Clinic, where her journey began as a receptionist. Through years of hard work, curiosity, and hands-on experience, Becca steadily advanced through every level of clinic operations—gaining a comprehensive understanding of the practice and the people it serves.
Brendan Czarnecki, ATC
Athletic Trainer
Brendan Czarnecki is a residency-trained athletic trainer with a hands-on, patient-centered approach. He manages all aspects of the clinic’s day-to-day flow including detailed medical history intake, physical examinations, and coordination of imaging, physical therapy, and patient communications. He also assists in the operating room and oversees the clinic’s regenerative medicine program, including PRP, bone marrow aspirate concentrate (BMAC), peptides, and orthobiologic protocol development.
Angela Ruiz
Chief Billing Officer
Angela Ruiz is the Chief Billing Officer at Masi Clinic, bringing over a decade of experience in medical billing. She grew up on the Peninsula and has built her career by focusing on accuracy, efficiency, and really understanding how the healthcare billing process works from start to finish. Known for her strategic approach, Angela plays a key role in streamlining billing practices and ensuring regulatory compliance. Her leadership helps support both patient satisfaction and the financial health of the organization.
Tracy Kalning
Medical Assistant
Tracy Kalning is a Certified Medical Assistant with over 30 years of experience in orthopedics. She leads with compassion, a positive attitude, and a deep commitment to patient care. Tracy is known for building strong relations with patients and staff, creating a supportive and empathetic clinical environment. Outside of work she enjoys the outdoors, walking, listening to music, and spending time with her family and especially her granddaughter.
Brenda Botello
Front Desk Receptionist
Brenda Botello is a warm and welcoming receptionist at MASI Clinic, known for her bubbly personality and genuine love for connecting with people. With a natural talent for communication and fluency in both English and Spanish, she makes every patient and visitor feel right at home from the moment they walk through the door or pick up the phone.
Angelea Raynor
Front Desk Receptionist
Angelea Raynor is a receptionist and entrepreneur, currently exploring a new field of study and expanding my professional horizons. I’m passionate about helping others, staying organized, and creating a welcoming experience for patients. When I’m not at work or studying, I’m usually outdoors — surfing, trail running, or playing basketball.
Dylan Loquist
Media Director
Dylan is the clinic’s media director, leading media strategy, video and podcast production, and studio operations across channels. He is passionate about empowering patients with educational content so they understand their injuries and take an active role in recovery.
