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Meet Our Surgeon

David R. Lionberger, MD

David R. Lionberger, MD
Board Certified
Orthopedic Surgeon

  • Total Knee Replacement
  • Total Hip Replacement
  • Shoulder Surgery
  • Arthroscopy of the Knee & Shoulder
  • Computer-Assisted Surgery Surgery of the Knee
  • Minimally Invasive Surgery
  • Partial Knee Replacement
    Hospital Affiliation:
  • The Methodist Hospital

Meet Our Staff

Maria Rojas

Maria Rojas
Office Manager / Surgery Coordinator

Maria began her career in the medical field when she joined David R. Lionberger, MD's practice in 1995. Maria schedules all surgical procedures and coordinates Dr. Lionberger's clinics. Maria works closely with the patients, and she reviews the details of surgery as well as gives detailed information on pre-operative instructions.

Sarah Cornelius, MPAS, PA-C

Sarah Cornelius, MPAS, PA-C
Physician Assistant

Sarah is our Physician Assistant and began working with Dr. Lionberger in January 2014. She attended Texas A&M University where she got a Bachelor of Science in Biomedical Sciences. Following her undergraduate degree, she received her Masters of Physician Assistant Studies from the University of Texas Medical Branch. As a PA, Sarah assists Dr. Lionberger in all surgical procedures, sees patients in her clinic where she provides pre-operative and post-operative care, administers injections in the hip and knee joints, and helps to coordinate surgeries and hospital care.

Cynthia Medrano

Cynthia Medrano
Office/Clinical Assistant

Cynthia joined Southwest Orthopedic Group in 2005 and Dr. Lionberger’s practice in 2013. Cynthia schedules surgical procedures as well as gets surgery pre-certifications and coordinates the Physician Assistant’s Clinic. Cynthia also schedules appointments and helps with insurance verifications.