# K191358: Trident II Acetabular System

- Pathway: 510(k) (Special)
- Applicant: Howmedica Osteonics Corp. A.K.A. Stryker Orthopaedics
- Decided: Oct 24, 2019 after 156 days
- Product code: LPH (Prosthesis, Hip, Semi-Constrained, Metal/Polymer, Porous Uncemented)
- Device class: 2
- Regulation: 21 CFR 888.3358
- Recalls of this device: none
- Data: FDA decisions to Oct 25, 2026; recalls to Oct 12, 2026

## Lineage
Longest line of descent: 9 generations back to K921308 (1994). 45 ancestors in all.
6 later devices descend from it; 2 cite it directly.
0 of 52 devices in its family (counting itself) have a Class I recall.

## Predicates on the family tree (from the FDA summary)
- K171768: Trident® II Acetabular System, Howmedica Osteonics Corp. A.K.A. Stryker Orthopaedics (2017) Summary page 4.
- K942809: Acetabular Dome Hole Plugs, Osteonics Corp. (1994) Summary page 5.

## Most influential descendants
- K220376: Acetabular Dome Hole Plug (2022), 5 descendants of its own
- K233498: Stryker Orthopaedics Hip Systems Labeling Update (2023), 4 descendants of its own
- K243784: Stryker Orthopaedics Hip Devices Labeling Update (2025), 2 descendants of its own
- K261624: Omnifit® 20° Series I Insert;Omnifit® Crossfire® 10° Series II Insert; Constrained Acetabular Insert; Trident® Crossfire® 0° Polyethylene Insert; Trident ® Crossfire ® 10° Polyethylene Insert;System 12 Crossfire® 10° Insert; Trident® 0° Constrained Acetabular Insert; Trident® Constrained Acetabular Liner;Trident® All Poly Constrained Acetabular Insert; Crossfire® Eccentric Insert 10°; Artisan® Bone Plug;UHR® Universal Head Bipolar Component (2026), 0 descendants of its own
- K250989: Stryker and Serf hip devices (2025), 0 descendants of its own

## Indications for use
Painful, disabling joint disease of the hip resulting from: degenerative arthritis, rheumatoid arthritis, post-traumatic arthritis or late stage avascular necrosis. Revision of previous unsuccessful femoral head replacement, cup arthroplasty or other procedure. Clinical management problems where arthrodesis or alternative reconstructive techniques are less likely to achieve satisfactory results. Where bone stock is of poor quality or is inadequate for other reconstructive techniques as indicated by deficiencies of the acetabulum. When used with MDM® Liners Treatment of nonunion, femoral neck and trochanteric fractures of the proximal femur with head involvement that are unmanageable using other techniques. Dislocation risks When used with Constrained Liner The Trident® Constrained Acetabular Insert is indicated for use in primary and revision patients at high risk of hip dislocation due to a history of prior dislocation, bone loss, joint or soft tissue laxity, neuromuscular disease, or intraoperative instability. The Trident® II Acetabular Shells are indicated for cementless use only.

Source page: https://510kreport.com/device/K191358
Methodology: https://510kreport.com/methodology