Knee
Dr. David Tonnies, M.D.
Dr. David Tonnies is a board-certified orthopedic surgeon practicing in Hermitage, Pennsylvania. Dr. Tonnies has performed 13 Medicare-verified knee replacements, ranking #288 in Pennsylvania.
In Pennsylvania, Dr. Tonnies performs below average in knee (13 vs 45 avg).
Dr. Tonnies's Medicare data shows a focused knee replacement practice with 13 verified procedures. Surgeons who concentrate on a single procedure type often develop deep procedural expertise, though total practice volume may include additional procedures not captured in Medicare fee-for-service data.
Hermitage is home to 4 orthopedic surgeons in the current Medicare dataset. Patients in the Hermitage area can compare surgeon volume and procedure specialization to find the right fit for their joint replacement needs.
Dr. Tonnies's Medicare data spans 10 years, beginning in 2013. Volume peaked at 23 procedures in 2017 before settling at 13 in the most recent data. Changes in Medicare reporting, payer mix shifts, or practice focus adjustments can all influence year-to-year volume.
Dr. Tonnies's 13 knee replacement procedures is below the national average of 45 among 6,720 surgeons. Medicare data captures roughly a third of all joint replacements, so actual volume is likely higher.
Verified Medicare Cases
How is this estimated?
Medicare Part B fee-for-service claims represent approximately 33–37% of all joint replacements performed nationally (source: CMS data, AJRR). This range estimates the surgeon's total practice volume across all payers. The verified Medicare count above is the definitive, audited figure.
How Dr. Tonnies Compares
Procedure volume compared to the Pennsylvania state average.
Contact & Location
Hermitage, PA 16148
Verified Case Volume Trends (2013-Current)
Volume Trend Analysis
Dr. Tonnies's recorded volume peaked at 23 procedures in 2017 and stood at 13 in the most recent data. Year-to-year variation can reflect changes in payer mix, practice scope, or Medicare billing patterns.
Hospital Affiliations & Quality
Quality ratings and complication rates are hospital-level metrics from CMS Hospital Compare and do not reflect individual surgeon performance. Star ratings updated quarterly. Complication data covers a rolling 3-year period.
Patient Resources: Preparing for Knee Replacement
If you are considering knee replacement surgery, these evidence-based guides can help you prepare and recover:
An overview of current surgical approaches including robotic-assisted and minimally invasive techniques, implant options, and expected outcomes.
Prehabilitation: Preparing Your Body for SurgeryEvidence-based exercises and lifestyle adjustments that can improve surgical outcomes and speed recovery when started weeks before your procedure.
Rehabilitation Roadmap: Your Complete Recovery GuideA structured physical therapy progression from the first post-op exercises through full strength and mobility restoration over 3 to 6 months.
Medicare Bundled Payment Programs for Joint ReplacementHow bundled payment models affect your joint replacement costs and care coordination, and what it means for hospital and surgeon selection.
Knee Replacement Recovery Overview
Recovery timelines vary by patient, but here is a general overview of what to expect after knee replacement surgery:
Individual recovery varies based on overall health, age, and adherence to physical therapy. View full knee replacement recovery guide and product recommendations
Frequently Asked Questions About Dr. Tonnies
How does Dr. Tonnies's procedure volume compare to other Pennsylvania surgeons?
Dr. Tonnies has performed 13 Medicare-verified joint replacement procedures. The Pennsylvania average is 63 procedures per surgeon. Medicare data captures roughly one-third of all joint replacements, so total volume may be higher. Dr. Tonnies ranks #356 out of 388 orthopedic surgeons in Pennsylvania.
What types of joint replacement does Dr. Tonnies perform?
Dr. Tonnies's reported Medicare volume is focused on knee replacement, with 13 verified procedures. Some surgeons choose to concentrate on a single joint type to build deep procedural expertise.
Are there other orthopedic surgeons near Dr. Tonnies in Hermitage?
Yes. There are 4 orthopedic surgeons in Hermitage in the current Medicare dataset. Patients can compare procedure volumes and specializations to choose the surgeon who best fits their needs. Use the state page to view all Pennsylvania surgeons.
What does the Medicare data for Dr. Tonnies represent?
The procedure counts shown are based on the most recent Medicare Part B fee-for-service claims data, published by the Centers for Medicare and Medicaid Services (CMS). This captures approximately 33–37% of all joint replacements performed nationally. Dr. Tonnies's total practice volume — including private insurance and Medicare Advantage patients — is likely higher than the 13 procedures shown here.
Has Dr. Tonnies's procedure volume changed over time?
Dr. Tonnies's Medicare-recorded volume peaked at 23 procedures in 2017 and was 13 in the most recent data. Volume fluctuations can reflect changes in payer mix, practice focus, or Medicare reporting rather than a change in overall surgical activity.
Which hospitals is Dr. Tonnies affiliated with?
According to CMS facility affiliation data, Dr. Tonnies is affiliated with Edgewood Surgical Hospital, Upmc Horizon, Sharon Regional Medical Center, Grove City Hospital.
How does Dr. Tonnies compare to other orthopedic surgeons in Hermitage?
Among the 4 orthopedic surgeons in Hermitage, Dr. Tonnies ranks #4 by total Medicare procedure volume. The highest-volume surgeon in Hermitage has 77 verified Medicare procedures.
What are the quality ratings for hospitals where Dr. Tonnies practices?
Edgewood Surgical Hospital (hip/knee complication rate similar to national average); Upmc Horizon (3 out of 5 CMS stars, hip/knee complication rate similar to national average); Sharon Regional Medical Center (2 out of 5 CMS stars, hip/knee complication rate similar to national average). These are hospital-level quality metrics from CMS Hospital Compare and do not reflect individual surgeon outcomes.
Other Orthopedic Surgeons in Hermitage, Pennsylvania
Dr. Tonnies's 13 Medicare procedures are below the Hermitage average of 43. The table below compares verified procedure volumes for orthopedic surgeons practicing in Hermitage.
| Surgeon | Procedures | Specialties |
|---|---|---|
| Dr. Mark Gardner | 77 | Hip, Knee, Shoulder |
| Dr. Bryan Hooks | 49 | Hip, Knee |
| Dr. Brian Shannon | 33 | Hip, Knee |
Patient Reviews & Ratings
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