Dr. Robert Sigmund, M.D.
Contact & Location
314-849-0311
Saint Louis, MO 63128
Dr. Sigmund performs more knee replacement procedures than 80% of orthopedic surgeons in Missouri, based on 2024 Medicare claims volume.Derived from the state ranking shown on this page: #32 of 166 ranked knee surgeons in Missouri.
About Dr. Sigmund
Practice. Dr. Robert Sigmund is a board-certified orthopedic surgeon practicing in Saint Louis, Missouri. The latest annual CMS data records 62 knee replacements and 40 hip replacements, 102 procedures in all. That is #32 in Missouri for knee replacement. A Medicare provider since 2006.
Trend. Medicare records run from 2014 to 2024, 10 years. Volume rose from 29 procedures a year to 102, up 252%.
National context. Among 6,612 knee replacement surgeons tracked nationally, 62 procedures is above the national average of 45.
Local context. Saint Louis has 57 orthopedic surgeons in the current Medicare data. Comparing volume and procedure mix across them is one way to narrow a shortlist.
Verified Case Volume Trends (2013-Current)
| Year | Hip Replacement | Knee Replacement |
|---|---|---|
| 2013 | 0 | 0 |
| 2014 | 11 | 18 |
| 2015 | 0 | 13 |
| 2016 | 0 | 23 |
| 2017 | 0 | 0 |
| 2018 | 0 | 23 |
| 2019 | 15 | 35 |
| 2020 | 18 | 32 |
| 2021 | 26 | 50 |
| 2022 | 27 | 50 |
| 2023 | 34 | 64 |
| 2024 | 40 | 62 |
Verified Medicare Cases
How is this estimated?
Medicare Part B fee-for-service claims are one payer stream among several, and the share they represent differs by procedure. In 2024 it was 23% to 28% for knee replacement, 25% to 33% for hip replacement. Each verified count above is divided by its own procedure's range, and the results are added, to estimate total practice volume across all payers. The verified Medicare count is the definitive, audited figure; this is a range derived from published national volume projections, not a measurement, and an individual practice can sit well outside it: how these ranges are derived, and their sources.
How Dr. Sigmund Compares
Procedure volume compared to the Missouri state average.
Volume Trend Analysis
Dr. Sigmund's Medicare-recorded procedure volume has trended upward over 10 years, increasing 252% from 29 procedures in 2014 to 102 in the most recent data.
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.
What to Expect on the Day of SurgeryA step-by-step walkthrough of your surgical day, from pre-op preparation through anesthesia, the procedure itself, and the first hours of recovery.
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 Coverage for Joint ReplacementWhat Medicare Part A and Part B cover for joint replacement surgery, including hospital stays, surgeon fees, anesthesia, and physical therapy.
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. Sigmund
How does Dr. Sigmund's procedure volume compare to other Missouri surgeons?
Dr. Sigmund has performed 102 Medicare-verified joint replacement procedures. This is significantly above the Missouri average of 59 procedures per surgeon. Dr. Sigmund ranks #32 out of 204 orthopedic surgeons in Missouri.
What types of joint replacement does Dr. Sigmund perform?
Dr. Sigmund's Medicare data shows procedures in knee replacement (62 cases) and hip replacement (40 cases).
Are there other orthopedic surgeons near Dr. Sigmund in Saint Louis?
Yes. There are 57 orthopedic surgeons in Saint Louis 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 Missouri surgeons.
What does the Medicare data for Dr. Sigmund represent?
The procedure counts shown are based on 2024 Medicare Part B fee-for-service claims data, published by the Centers for Medicare and Medicaid Services (CMS). Medicare fee-for-service is only one payer stream, and the share of national volume it represents differs by procedure. In 2024 the share was 23% to 28% for knee replacement, 25% to 33% for hip replacement, which puts Dr. Sigmund's total volume across all insurers at roughly 340 to 430 procedures against the 102 verified here. Those shares are derived from published national volume projections rather than quoted from a single publication, and they are estimates with real uncertainty. The OrthoProcedures methodology page shows the full derivation, the sources, and the limits at orthoprocedures.com/data-methodology.html.
Has Dr. Sigmund's procedure volume changed over time?
Yes. Dr. Sigmund's Medicare-recorded volume has increased from 29 procedures in 2014 to 102 in the most recent data, a 252% increase over 10 years. This upward trend suggests an expanding joint replacement practice. Peak volume was 102 procedures in 2024.
Does Dr. Sigmund perform more than one type of joint replacement?
Yes. Dr. Sigmund's Medicare data shows procedures in knee replacement (62 cases), hip replacement (40 cases). Surgeons who perform multiple joint replacement types maintain broad technical skills across different anatomical joints.
Which hospitals is Dr. Sigmund affiliated with?
According to CMS facility affiliation data, Dr. Sigmund is affiliated with Mercy Hospital South, Mercy Hospital St Louis, St Lukes Hospital, Mercy Hospital Jefferson.
How does Dr. Sigmund compare to other orthopedic surgeons in Saint Louis?
Among the 57 orthopedic surgeons in Saint Louis, Dr. Sigmund ranks #9 by total Medicare procedure volume. The highest-volume surgeon in Saint Louis has 279 verified Medicare procedures.
What are the quality ratings for hospitals where Dr. Sigmund practices?
Mercy Hospital South (3 out of 5 CMS stars, hip/knee complication rate similar to national average); Mercy Hospital St Louis (3 out of 5 CMS stars, hip/knee complication rate similar to national average); St Lukes Hospital (4 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 Saint Louis, Missouri
Dr. Sigmund's 102 Medicare procedures are below the Saint Louis average of 156. The table below compares verified procedure volumes for orthopedic surgeons practicing in Saint Louis.
| Surgeon | Procedures | Specialties |
|---|---|---|
| Dr. Ryan Nunley | 279 | Hip, Knee |
| Dr. Christopher Palmer | 160 | Hip, Knee |
| Dr. Michael Hubbard | 144 | Hip, Knee, Shoulder |
| Dr. Coles L'hommedieu | 139 | Hip, Knee |
| Dr. Ilya Bendich | 137 | Hip, Knee |
| Dr. Christopher Mudd | 132 | Hip, Knee |
Patient Resources & Verification
Research reviews, verify credentials, and check official quality data through these trusted sources:
Medicare Care Compare and NPI Registry are official U.S. government sources. Google reviews reflect user-submitted feedback. OrthoProcedures.com does not verify the accuracy of third-party review content.