Cleared Traditional

K243656 - U2 Total Knee System – PF+ Patella (FDA 510(k) Clearance)

Also includes:
USTAR II System– PF+ Patella

Class II Orthopedic device cleared through predicate-based substantial equivalence - typically does not require clinical trials.

K243656 · United Orthopedic Corporation · Orthopedic device
Download Printable Device Report (PDF)
Optimized for regulatory review, auditing and printing
Jul 2025
Decision
247d
Days
Class 2
Risk

K243656 is an FDA 510(k) clearance for the U2 Total Knee System – PF+ Patella. Classified as Prosthesis, Knee, Patello/femorotibial, Semi-constrained, Uncemented, Porous, Coated, Polymer/metal/polymer (product code MBH), Class II - Special Controls.

Submitted by United Orthopedic Corporation (Hsinchu City, TW). The FDA issued a Cleared decision on July 31, 2025 after a review of 247 days - an extended review cycle.

This device falls under the Orthopedic FDA review panel, regulated under 21 CFR 888.3565 - the FDA orthopedic device regulatory framework. The Traditional 510(k) pathway establishes clearance through substantial equivalence to a legally marketed predicate device, without requiring clinical trial data.

Device pattern: Standard predicate-based submission. Standard predicate reliance. This clearance follows a standard predicate-based equivalence path within the Orthopedic review framework, consistent with the majority of Class II 510(k) submissions.

View all United Orthopedic Corporation devices

Submission Details

510(k) Number K243656 FDA.gov
FDA Decision Cleared Substantially Equivalent - Traditional 510(k) (SESE)
Date Received November 26, 2024
Decision Date July 31, 2025
Days to Decision 247 days
Submission Type Traditional
Review Panel Orthopedic (OR)
Summary Summary PDF
Third-party Review No - reviewed directly by FDA
Combination Product No
PCCP Authorized No
Regulatory Context
Review time vs. panel average
125d slower than avg
Panel avg: 122d · This submission: 247d
Pathway characteristics
Predicate-based equivalence. No clinical trials required.

Device Classification

Product Code MBH Prosthesis, Knee, Patello/femorotibial, Semi-constrained, Uncemented, Porous, Coated, Polymer/metal/polymer
Device Class Class 2 - Special Controls
CFR Regulation 21 CFR 888.3565
What this classification means

Class II devices require demonstration of substantial equivalence to a legally marketed predicate device. This pathway does not require clinical trials - it relies on engineering equivalence and performance data. Most Orthopedic devices follow this clearance model.

Regulatory Consultant

NJK & Associates, Inc.
Natalie J Kennel

The regulatory consultant manages the 510(k) submission process on behalf of the applicant - coordinating technical documentation, predicate strategy and FDA communications. Identifying the consultant behind a submission is a key signal for competitive regulatory intelligence.

Regulatory Peers - MBH Prosthesis, Knee, Patello/femorotibial, Semi-constrained, Uncemented, Porous, Coated, Polymer/metal/polymer

All 141
Devices cleared under the same product code (MBH) and FDA review panel - the closest regulatory comparables to K243656.
Persona the Personalized Knee System (Persona Porous Plasma Spray PPS Femurs)
K253189 · Zimmer, Inc. · Mar 2026
GMK 3D Metal Tibial Tray Extension
K253328 · Medacta International S.A. · Feb 2026
Triathlon® Total Knee System - Triathlon® X3® Medial Stabilized Tibial Bearing Insert
K253637 · Howmedica Osteonics Corp., Dba Stryker Orthopaedics · Feb 2026
Active-V Total Knee System
K253239 · Signature Orthopaedics Pty, Ltd. · Dec 2025
Balanced Knee System TriMax Porous Femoral Components
K253161 · Ortho Development Corp. · Dec 2025
Freedom Metaphyseal Cone Implants (Metaphyseal Cones)
K252777 · Maxx Orthopedics, Inc. · Oct 2025