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Run your analysis now →https://www.patsnap.com/resources/blog/rd-blog/hip-stem-fixation-and-bone-ingrowth-patent-landscape/ · Patsnap · data cut-off 2026-07-31 · downloaded from the live page
Patent Landscape · Orthopedic ImplantsHip stem fixation and bone ingrowth patents: who holds the claims and where the field is still open
- One assignee dominates the ranked field. the leader holds 23 records against a fifth-place count of 5 and a tenth-place count of 2, a steep drop-off rather than an even spread.
- Filing has grown, not stalled. activity moved from 2 records in 2021 to 3 in 2024, a +50% rise over that three-year span, with 2023 the peak year so far at 4.
- Claims cluster tightly in implants and prostheses. 93.6% of the 78 records in scope sit in A61F, with much smaller footprints in sterilising (15.4%) and dentistry-adjacent coating classes (14.1%).
78
Published Records
+50%
Filing Growth 2021→2024
US
Leading Jurisdiction
26
Active Filers Ranked
Filing growth compares 2021 (2 records) with 2024 (3) — a three-year span. 2024 is the most recent year we treat as complete: publication lags filing by roughly 18 months, so 2025 onwards are still filling in and any growth rate that ends there would understate the field.
Published byPatsnap Research··7 min readSourced from Patsnap Eureka
Overview
What this landscape covers
This dataset tracks patent activity at the intersection of cementless femoral stem fixation and bone ingrowth — the mechanical and surface-engineering work that determines whether a hip stem achieves durable press-fit stability without bone cement. Search terms combine fixation and stem hardware language with the specific failure and success modes practitioners care about: porous coating, stress shielding, stem taper geometry, press-fit stability and stem subsidence. The scope spans 2015 through the 2026 data cut-off, covering 78 published records.
Filing offices skew heavily to the United States (34 records), with Europe (EPO, 15), WIPO/PCT (9) and Canada (6) forming a secondary tier. That distribution points to a field where US prosecution sets the pace and international filing follows selectively rather than blanketing every major jurisdiction.
Filing activity and technology composition, 2015–2026
Source: Patsnap Eureka. Assignee ranking and totals. Derived from a Patsnap search on Hip Stem Fixation and Bone Ingrowth covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
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The Data
Filing trend and technology composition
Two views of the same 78 records: how filing volume has moved year over year, and which IPC subclasses the claims actually sit in.
Filing trend, 2017–2026
Volume moved from 3 records in 2017 to a peak of 4 in 2023, with the most recent complete year, 2024, at 3 — up 50% from 2021's 2 records. 2025 and 2026 show fewer records only because publication lags filing by roughly 18 months; treat the tail end of the chart as still filling in rather than as a decline.
IPC subclass composition
A61F (implants and prostheses) covers 93.6% of the 78 records, confirming this is fundamentally an implant-hardware field. Smaller but non-trivial overlaps appear with A61L sterilising (15.4%) and A61C dentistry-adjacent coating work (14.1%), reflecting shared porous-coating and antimicrobial-surface techniques. Because records can carry multiple classes, these shares sum to well over 100% and should be read against the 78-record total, not against each other.
Shares are the percentage of the 78 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Source: Patsnap Eureka. Filing trend and technology composition. Derived from a Patsnap search on Hip Stem Fixation and Bone Ingrowth covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.
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Most-cited records in this landscape
Representative Filing
Technologies for monitoring bone ingrowth of an orthopaedic prosthesis (US20240065623A1)
DEPUY SYNTHES PRODUCTS, INC.
A system for monitoring bone ingrowth includes an orthopaedic prosthesis having a circuit configured to transmit force sensor data indicative of an amount of force applied to a stem of the orthopaedic prosthesis in response to receiving power from an external power supply. The force sensor data is indicative of bone ingrowth of the orthopaedic prosthesis, allowing a surgeon to monitor that data over time to confirm sufficient bone ingrowth has occurred.Filed by DePuy Synthes Products, Inc., published 2024-02-29 — one of the most recent substantive filings in this dataset and a departure from purely mechanical fixation claims toward instrumented, sensor-based monitoring.
Highest-citation records
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US20140363481A1 | Bone replacement implants with mechanically biocompatible cellular material | 103 |
| 2 | US20070219641A1 | Prosthetic hip implants | 94 |
| 3 | US5549702A | Flexible orthopaedic stem apparatus | 81 |
| 4 | US20080167723A1 | Prosthetic hip implants | 59 |
| 5 | US20070134287A1 | Method for coating biocompatible substrates with antibiotics | 38 |
| 6 | US8088169B2 | Prosthetic hip implants | 36 |
| 7 | WO2013091085A1 | Bone replacement implants with mechanically biocompatible cellular material | 33 |
| 8 | US7842096B2 | Hip stem prosthesis | 29 |
| 9 | US20180000598A1 | Hip stem | 23 |
| 10 | US20140330390A1 | Cementless Hip Stem | 22 |
Citation counts inside this corpus favour older filings that have simply had longer to accumulate citations — read them as a signal of influence on the field, not as a ranking of current commercial importance.
Each row carries its publication number; clicking a row searches Eureka by that number.
Source: Patsnap Eureka. Citation counts and representative records. Derived from a Patsnap search on Hip Stem Fixation and Bone Ingrowth covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
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What the numbers mean for a filing decision
Three patterns in this dataset matter more to a filing or freedom-to-operate decision than the raw counts alone.
Concentration
23 vs. 5 vs. 2
leader vs. fifth vs. tenth place
One assignee, then a steep drop
The leader's record count dwarfs the field: 23 records against 5 at fifth place and 2 at tenth. That is a single dominant portfolio holder surrounded by a long tail of much smaller filers, not an evenly contested field.
26 assignees ranked in total
Growth
+50%
2021 → 2024 records
Filing is still building, not slowing
Records rose from 2 in 2021 to 3 in 2024 — a 50% increase over that span, with 2023 the peak year so far at 4. Because publication lags filing by roughly 18 months, the lighter-looking 2025–2026 counts are incomplete, not evidence of a cooling field.
2024 is the most recent complete year
Collaboration
10 pairs
co-assignee pairs identified
A small cluster of repeat co-filers
Ten co-assignee pairs appear in the dataset, with three individual inventors — Paprosky, Rosenberg and Dorr — each pairing with one another four times. That pattern suggests a tight surgeon-inventor network rather than broad cross-company joint filing.
Strongest pairs each co-filed 4 times
Technology mix
93.6%
of 78 records in A61F
Implant hardware dominates, coating overlaps are secondary
Nearly every record touches A61F implants and prostheses. The next-largest overlaps — sterilising (15.4%) and dentistry-adjacent coating (14.1%) — point to shared porous-coating and surface-treatment techniques rather than a separate line of technology.
Shares sum above 100% because records carry multiple IPC classes
Eureka AI Agent
Looking for what nobody has claimed yet?
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to hip stem fixation and bone ingrowth, with the prior art for and against each one.
Source: Patsnap Eureka. Co-assignee relationships and derived observations. Derived from a Patsnap search on Hip Stem Fixation and Bone Ingrowth covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
Players
Who is active, and where the momentum has cooled
The ranked field is narrow — 26 assignees in total — and dominated at the top by one corporate holder, with individual surgeon-inventors forming a distinct secondary cluster through repeat co-filing.
Leader
23
records
A single dominant portfolio holder
The top-ranked assignee holds 23 of the records in this ranking, far ahead of the rest of the field. That scale suggests broad coverage across stem geometry, coating and taper claims that any new entrant needs to map before filing nearby.
Recent-year momentum: 0 filings in the latest year
Mid-tier
5
records at fifth place
A thin secondary tier
Fifth place holds only 5 records, and tenth place just 2 — a fast drop-off from the leader that leaves most of the ranked field as small, single-digit portfolios rather than sustained programmes.
26 assignees ranked in total
Inventor network
4
co-filings per strongest pair
Surgeon-inventors filing together repeatedly
Paprosky, Rosenberg and Dorr each appear together in four co-assigned filings, the strongest pairs in the dataset. That points to a small, established clinical network driving a meaningful share of non-corporate filing activity.
10 co-assignee pairs identified overall
Recent-year filing momentum by assignee
| Assignee | Recent year | YoY |
|---|---|---|
| Zimmer, Inc. | 0 | — |
| McGill University | 0 | — |
| KIRWAN DAVID PHILLIP | 0 | — |
| PAPROSKY WAYNE G | 0 | — |
| ZIMMER TECHNOLOGY INC | 0 | — |
| IP2IPO Innovations Ltd. | 0 | — |
| DePuy (Ireland) Ltd. | 0 | — |
| VALUE FORCES LTD | 0 | — |
Source: Patsnap Eureka. Assignee-level momentum. Derived from a Patsnap search on Hip Stem Fixation and Bone Ingrowth covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
What's Next
Where to take this analysis
The dataset points to specific next steps depending on whether the goal is freedom-to-operate, portfolio strategy or identifying open claim space.
Map the leader's claim boundaries
With 23 records concentrated in one portfolio, a freedom-to-operate review should start by charting exactly which stem geometries, coatings and taper configurations that holder has already claimed.
Explore assignee portfolios in EurekaTest the sensor-monitoring branch for openings
US20240065623A1 signals a shift toward instrumented bone-ingrowth monitoring. Given the small footprint of G06F-overlapping records (2.6% of the 78), this branch warrants closer claim-by-claim review.
Run a white-space search in EurekaWatch the inventor network for new filings
The Paprosky–Rosenberg–Dorr cluster shows repeat co-filing behaviour; tracking their future publications may surface incremental claims before they broaden.
Set up assignee alerts in EurekaSource: Patsnap Eureka. Forward-looking reading of the same dataset. Derived from a Patsnap search on Hip Stem Fixation and Bone Ingrowth covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
FAQ
Common questions about this landscape
One assignee leads the ranked field with 23 records, well ahead of the rest — fifth place holds only 5 and tenth place just 2. This steep drop-off means the field is not evenly contested; a single corporate portfolio covers a large share of the documented claim space, while the remaining 26 ranked assignees each hold much smaller positions. Anyone assessing freedom-to-operate should treat that leader's portfolio as the first thing to map, not an afterthought.
It is growing, based on the complete-year data available. Records rose from 2 in 2021 to 3 in 2024, a 50% increase over that span, with 2023 the peak year so far at 4. The apparent dip in 2025 and 2026 is an artefact of publication lag — publication typically trails filing by around 18 months — so those final years should not be read as a slowdown.
The overwhelming majority, 93.6% of the 78 records in scope, sit in IPC subclass A61F, which covers implants and prostheses generally. Smaller but meaningful overlaps exist with A61L sterilising and disinfecting technology (15.4%) and A61C dentistry-adjacent techniques (14.1%), both likely reflecting shared porous-coating and surface-treatment methods rather than a distinct product line. Because a single record can carry multiple IPC classes, these percentages add up to more than 100% and should each be read against the 78-record total.
It describes an orthopaedic prosthesis with a circuit that transmits force sensor data indicative of load applied to the stem, which in turn indicates whether bone ingrowth has sufficiently occurred. The system draws power from an external supply and lets a surgeon track that data over time rather than relying solely on imaging or clinical judgement. Filed by DePuy Synthes Products, Inc. and published 2024-02-29, it represents a shift from purely mechanical fixation claims toward instrumented, sensor-based verification of ingrowth.
The clearest opening is sensor-instrumented ingrowth monitoring, a branch with only a thin footprint in this dataset (G06F overlaps at 2.6% of 78 records) despite the representative DePuy Synthes filing showing commercial interest. Stem taper micro-geometry and press-fit subsidence detection methods also show limited direct coverage relative to the dense core claims in porous coating and general stem hardware. Any new filing in these areas should be checked closely against the dominant leader's existing portfolio, since broad stem-geometry claims may already sit nearby.
Answers are grounded in the same dataset. Derived from a Patsnap search on Hip Stem Fixation and Bone Ingrowth covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish.Run this in Eureka MCP
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Disclaimer. This page is generated from Patsnap Eureka data drawn from a limited snapshot of global patent and scientific-literature records, and is provided for general information and reference only.
Patent data carries inherent limitations: recent filings (typically the most recent 18–24 months) are under-counted due to standard publication lag; counts may be reported at either a patent-family or a patent-record basis and are not always directly comparable; classification, applicant-name, and citation data may contain errors, duplicates, or omissions; and the underlying search query defines and constrains the scope shown. As a result, the analysis may be incomplete or inaccurate and may not reflect the full technology landscape.
Nothing on this page constitutes an exhaustive prior-art, novelty, freedom-to-operate, or validity search, nor does it constitute legal, financial, investment, or professional advice, and it should not be relied upon as such. Any patent, commercial, or strategic decision should be verified independently and reviewed with qualified patent, legal, and domain professionals. Patsnap makes no warranties, express or implied, as to the accuracy, completeness, or fitness for any particular purpose of the information presented.
Machine translation. Assignee and organisation names originally recorded in Chinese, Japanese or Korean have been rendered into English by an AI translation step so that the tables stay readable. These renderings are best-effort and may not match a company's registered English name; the original name is what the underlying patent record carries, and it is what any Eureka query launched from this page uses.