Dr. Robert Lock, Ii, D.O.
Contact & Location
928-758-1175
Bullhead City, AZ 86442
Dr. Lock, Ii performs more knee replacement procedures than 75% of orthopedic surgeons in Arizona, based on 2024 Medicare claims volume.Derived from the state ranking shown on this page: #37 of 152 ranked knee surgeons in Arizona.
About Dr. Lock, Ii
Dr. Robert Lock, Ii is a board-certified orthopedic surgeon practicing in Bullhead City, Arizona. A Medicare provider since 2006, Dr. Lock, Ii completed 65 knee replacements (#37 in Arizona), 30 hip replacements, and 23 shoulder replacements in the latest annual CMS data, totaling 118 Medicare-verified procedures.
In Arizona, Dr. Lock, Ii performs above the state average in knee (65 vs 49), below the state average in hip (30 vs 40), below the state average in shoulder (23 vs 31).
Dr. Lock, Ii performs all three major joint replacement procedures (hip, knee, and shoulder), indicating a broad scope of orthopedic practice. The largest share is knee replacements (65 cases), followed by hip replacements (30) and shoulder replacements (23).
Bullhead City is home to 2 orthopedic surgeons in the current Medicare dataset. Patients in the Bullhead City area can compare surgeon volume and procedure specialization to find the right fit for their joint replacement needs. Dr. Lock, Ii also maintains hospital privileges in AZ and CA, indicating a regional practice that extends beyond Arizona.
Dr. Lock, Ii's Medicare data spans 12 years, beginning in 2013. Volume peaked at 194 procedures in 2020 before settling at 118 in the most recent data. Changes in Medicare reporting, payer mix shifts, or practice focus adjustments can all influence year-to-year volume.
Among 6,599 knee replacement surgeons tracked nationally, Dr. Lock, Ii's 65 verified procedures is above the national average of 45.
Verified Case Volume Trends (2013-Current)
| Year | Hip Replacement | Knee Replacement | Shoulder Replacement |
|---|---|---|---|
| 2013 | 58 | 99 | 0 |
| 2014 | 37 | 83 | 0 |
| 2015 | 41 | 77 | 0 |
| 2016 | 41 | 88 | 0 |
| 2017 | 36 | 62 | 0 |
| 2018 | 50 | 93 | 0 |
| 2019 | 50 | 101 | 0 |
| 2020 | 54 | 111 | 29 |
| 2021 | 35 | 90 | 22 |
| 2022 | 37 | 85 | 21 |
| 2023 | 39 | 95 | 22 |
| 2024 | 30 | 65 | 23 |
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, 29% to 37% for shoulder 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. Lock, Ii Compares
Procedure volume compared to the Arizona state average.
Volume Trend Analysis
Dr. Lock, Ii's recorded volume peaked at 194 procedures in 2020 and stood at 118 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.
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.
Recovery Timeline: Week-by-Week ExpectationsA detailed week-by-week guide covering pain levels, mobility milestones, physical therapy progression, and when to expect a return to daily activities.
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. Lock, Ii
How does Dr. Lock, Ii's procedure volume compare to other Arizona surgeons?
Dr. Lock, Ii has performed 118 Medicare-verified joint replacement procedures. This is significantly above the Arizona average of 72 procedures per surgeon. Dr. Lock, Ii ranks #38 out of 191 orthopedic surgeons in Arizona.
What types of joint replacement does Dr. Lock, Ii perform?
Dr. Lock, Ii performs all three major joint replacement procedures: knee replacement (65 cases), hip replacement (30 cases), shoulder replacement (23 cases). This breadth indicates a comprehensive orthopedic joint replacement practice.
Are there other orthopedic surgeons near Dr. Lock, Ii in Bullhead City?
Yes. There are 2 orthopedic surgeons in Bullhead City 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 Arizona surgeons.
What does the Medicare data for Dr. Lock, Ii 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, 29% to 37% for shoulder replacement, which puts Dr. Lock, Ii's total volume across all insurers at roughly 390 to 480 procedures against the 118 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. Lock, Ii's procedure volume changed over time?
Dr. Lock, Ii's Medicare-recorded volume peaked at 194 procedures in 2020 and was 118 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.
Does Dr. Lock, Ii perform more than one type of joint replacement?
Yes. Dr. Lock, Ii's Medicare data shows procedures in knee replacement (65 cases), hip replacement (30 cases), shoulder replacement (23 cases). Performing all three major joint replacements places Dr. Lock, Ii among the 5% of orthopedic surgeons nationally who cover hip, knee, and shoulder arthroplasty.
Which hospitals is Dr. Lock, Ii affiliated with?
According to CMS facility affiliation data, Dr. Lock, Ii is affiliated with Western Arizona Regional Medical Center, Valley View Medical Center, Kingman Regional Medical Center, Havasu Regional Medical Center, Colorado River Medical Center. Dr. Lock, Ii maintains hospital privileges across state lines, indicating a practice that serves patients in multiple states.
What are the quality ratings for hospitals where Dr. Lock, Ii practices?
Western Arizona Regional Medical Center (2 out of 5 CMS stars, hip/knee complication rate similar to national average); Valley View Medical Center (2 out of 5 CMS stars, insufficient case volume for complication rate comparison); Kingman Regional Medical Center (4 out of 5 CMS stars, insufficient case volume for complication rate comparison). These are hospital-level quality metrics from CMS Hospital Compare and do not reflect individual surgeon outcomes.
Other Orthopedic Surgeons in Bullhead City, Arizona
Dr. Lock, Ii's 118 Medicare procedures are above the Bullhead City average of 65. The table below compares verified procedure volumes for orthopedic surgeons practicing in Bullhead City.
| Surgeon | Procedures | Specialties |
|---|---|---|
| Dr. Nathan Weaver | 12 | 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.