510(k) · Cleared
ClearedConformity Stem
Data to Oct 25, 2026 (FDA decisions) Oct 12, 2026 (recalls) Sep 30, 2026 (MAUDE) refreshed weekly
United Orthopedic Corporation · LZO Prosthesis, Hip, Semi-Constrained, Metal/Ceramic/Polymer, Cemented Or Non-Porous, Uncemented
Cleared on Aug 8, 2019 as substantially equivalent to K042992 (DePuy Orthopaedics, Inc., 2005) after a 252-day review. Its family tree reaches back 6 generations to 1994. 3 later devices descend from it.
- Decided
- Aug 8, 2019
- Review
- 252 days
- Class
- Class II
- Product code
- LZO
- Recalls
- None
- Predicates
- 1
Its longest line of descent runs back 6 generations to K935452 (1994). 16 ancestors in all, the oldest K851422 (1985). 3 later devices descend from it, 3 citing it directly.
- Root · 6 generations backK935452 P.F.C. 2 Total Hip System Porous Coated Modular Femoral ComponentJohnson & Johnson Orthopaedics, Inc. · 1994
- 5 generations backK945518 P.F.C. 2 Total Hip System Porous Coated Modular Femoral ComponentJohnson & Johnson Professionals, Inc. · 1996
- 4 generations backK961939 S-Rom Femoral Hip Stem (Sizes 12 X 06 X 115 and 12 X 07 X 115)Johnson & Johnson Professionals, Inc. · 1996
- 3 generations backK974331 Uni-Rom Total Hip System Femoral StemJohnson & Johnson Professionals, Inc. · 1998
- 2 generations backK001991 Titan Porocoat Hip ProsthesisDePuy Orthopaedics, Inc. · 2000
- 1 generation backK042992 Corail Amt Hip ProsthesisDePuy Orthopaedics, Inc. · 2005 · Recalled
- This deviceK183312 Conformity StemUnited Orthopedic Corporation · 2019
- Descendant · cites it directly · 1 of its ownK242249 Conformity Stem Extension LineUnited Orthopedic Corporation · 2024
- Descendant · cites it directly · 0 of its ownK242315 Resolve Modular Revision Hip StemUnited Orthopedic Corporation · 2025
- Descendant · cites it directly · 0 of its ownK243466 Conformity Stem Extension Line, #0United Orthopedic Corporation · 2025
Most influential descendants
Showing 3 of 3 · See all- K242249Conformity Stem Extension LineUnited Orthopedic Corporation · 2024 · cites it directly1descendant
- K242315Resolve Modular Revision Hip StemUnited Orthopedic Corporation · 2025 · cites it directly0descendants
- K243466Conformity Stem Extension Line, #0United Orthopedic Corporation · 2025 · cites it directly0descendants
View FIG. 1 as a table
Line of descent and top descendants
| Generation | Number | Device | Applicant | Decided | Recalls |
|---|---|---|---|---|---|
| −6 | K935452 | P.F.C. 2 Total Hip System Porous Coated Modular Femoral Component | Johnson & Johnson Orthopaedics, Inc. | 1994 | — |
| −5 | K945518 | P.F.C. 2 Total Hip System Porous Coated Modular Femoral Component | Johnson & Johnson Professionals, Inc. | 1996 | — |
| −4 | K961939 | S-Rom Femoral Hip Stem (Sizes 12 X 06 X 115 and 12 X 07 X 115) | Johnson & Johnson Professionals, Inc. | 1996 | — |
| −3 | K974331 | Uni-Rom Total Hip System Femoral Stem | Johnson & Johnson Professionals, Inc. | 1998 | — |
| −2 | K001991 | Titan Porocoat Hip Prosthesis | DePuy Orthopaedics, Inc. | 2000 | — |
| −1 | K042992 | Corail Amt Hip Prosthesis | DePuy Orthopaedics, Inc. | 2005 | 1 |
| 0 (this device) | K183312 | Conformity Stem | United Orthopedic Corporation | 2019 | — |
| +1 | K242249 | Conformity Stem Extension Line | United Orthopedic Corporation | 2024 | — |
| +1 | K242315 | Resolve Modular Revision Hip Stem | United Orthopedic Corporation | 2025 | — |
| +1 | K243466 | Conformity Stem Extension Line, #0 | United Orthopedic Corporation | 2025 | — |
Other ancestors by year cleared
| Year cleared | Devices | With a Class I recall |
|---|---|---|
| 1985 | 1 | 0 |
| 1991 | 1 | 0 |
| 1992 | 2 | 0 |
| 1993 | 1 | 0 |
| 1994 | 2 | 0 |
| 1996 | 3 | 0 |
Descendants by year cleared
| Year cleared | Devices | With a Class I recall |
|---|---|---|
| 2024 | 1 | 0 |
| 2025 | 2 | 0 |
Sources: FDA 510(k) database (decision fields), the FDA summary (predicates and indications), FDA recall and enforcement reports, and MAUDE; processed by 510(k) Report. Verify on FDA.gov · Methodology and accuracy.
Planning a device in LZO? A 510(k) Report weighs predicate choices, recall history and review times for a new device like this one.
Top candidate predicates for a new LZO device
- #1 K192827 Quadra-Pscore 19.3 · 10 generations · no Class I recall
- #2 Held for the reportin the report
- #3 Held for the reportin the report
What was it cleared against? (1)
Devices the submitter claimed this one is substantially equivalent to (*), and reference devices cited for a specific test or feature (†), as written in the FDA summary.
| Type | Number | Device | Decided |
|---|---|---|---|
| * | K042992 | Corail Amt Hip ProsthesisSummary page 4…ss Class II Classification Panel Orthopedics Product Code LZO, MEH Predicate Device “Depuy” Corail ATM Hip Prosthesis (K042992) Reference Device “United” U2 Hip Stem, HA/ Ti plasma spray (K003237) “United” UTF Stem r… | 2005 |
| † | K003237 | U2 Hip Stem, TI Porous Coated | 2001 |
| † | K132207 | Utf Stem-Reduced, Additional Sizes | 2013 |
What descends from it? (3)
3 later devices cite it directly; ranked here by how many devices descend from each in turn.
Has anything in its family been recalled? (0 Class I)
No FDA recall names this device.
No ancestor or descendant has a Class I recall.
What does this lineage say?
- The line of descent spans 25 years and passes through 4 companies; a new generation was cleared every 2.5 years on median.
- 1 of the 16 ancestors has a recall of any class.
- Of its descendants, K242249 (United Orthopedic Corporation, 2024) has gone furthest, with 1 descendant of its own.
- 26 other devices also cite its predicate K042992.
How does its category compare?
All LZO devicesLZO Prosthesis, Hip, Semi-Constrained, Metal/Ceramic/Polymer, Cemented Or Non-Porous, Uncemented: FDA decisions, review times, recalls and adverse event reports over 20 years. 2019, this device’s year, is highlighted.
FDA decisions per year · LZO
14in 2025
2026 to Oct 25, outlined.
Median 510(k) review, days · LZO
119in 2025
Receipt to decision; years with fewer than 3 clearances left blank.
Recalls per year · LZO
1in 2025
Class I (0 since 2007) Class II/III not classified
Adverse event reports per year · LZO
3,244in 2025
MAUDE reports naming product code LZO, not matched to any one device; reports are not rates.
View these four charts as a table
| Year | Decisions | Median 510(k) review, days | Recalls (Class I) | MAUDE reports |
|---|---|---|---|---|
| 2007 | 9 | 87 | 2 | 138 |
| 2008 | 11 | 63 | 13 | 125 |
| 2009 | 7 | 83 | 42 | 189 |
| 2010 | 15 | 78 | 0 | 394 |
| 2011 | 13 | 87 | 10 | 544 |
| 2012 | 14 | 98 | 14 | 963 |
| 2013 | 26 | 100 | 0 | 1,370 |
| 2014 | 13 | 85 | 1 | 1,477 |
| 2015 | 12 | 115 | 1 | 1,348 |
| 2016 | 10 | 177 | 9 | 1,728 |
| 2017 | 16 | 257 | 5 | 2,165 |
| 2018 | 18 | 163 | 2 | 3,133 |
| 2019 | 28 | 109 | 4 | 3,066 |
| 2020 | 18 | 112 | 3 | 1,963 |
| 2021 | 12 | 170 | 0 | 2,199 |
| 2022 | 11 | 279 | 4 | 1,985 |
| 2023 | 10 | 122 | 2 | 2,066 |
| 2024 | 11 | 111 | 1 | 2,586 |
| 2025 | 14 | 119 | 1 | 3,244 |
| 2026 | 9 | 102 | 0 | — |
What is it indicated for?
The device is indicated for use in hip arthroplasty in skeletally mature patients with the following conditions:
1. A severely painful and/or disabled joint from osteoarthritis, traumatic arthritis, rheumatoid arthritis, or congenital hip
dyplasia.
2. Avascular necrosis of the femoral head.
3. Acute traumatic fracture of the femoral head or neck.
4. Failed previous hip surgery including joint reconstruction, internal fixation, arthrodesis, hemiarthroplasty, surface
replacment or total hip replacement.
5. Certain cases of ankylosis.
Conformity stem is for cementless use only.
Indications for use as stated in the FDA summary.
https://510kreport.com/device/K183312 · printed Nov 5, 2026
Cite this page
510(k) Report. “K183312: Conformity Stem.” Lineage record from FDA 510(k) data and the FDA summary. Updated Nov 3, 2026. Accessed Nov 5, 2026. https://510kreport.com/device/K183312
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Record history
- FDA decision record loaded May 2, 2026
- Summary read Oct 13, 2026 (extraction version 9eaa42aa01ed)
- Lineage and recalls computed Nov 3, 2026
- Page last updated Nov 3, 2026