Cleared Traditional

NATURAL-KNEE II UNICOMPARTMENTALKNEE SYSTEM (K955778) - FDA 510(k) Clearance

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

K955778 · Intermedics Orthopedics · Orthopedic device
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Mar 1996
Decision
79d
Days
Class 2
Risk

K955778 is an FDA 510(k) clearance for the NATURAL-KNEE II UNICOMPARTMENTALKNEE SYSTEM. Classified as Prosthesis, Knee, Femorotibial, Semi-constrained, Cemented, Metal/polymer (product code HRY), Class II - Special Controls.

Submitted by Intermedics Orthopedics (Austin, US). The FDA issued a Cleared decision on March 8, 1996 after a review of 79 days - a notably fast clearance cycle.

This device falls under the Orthopedic FDA review panel, regulated under 21 CFR 888.3530 - 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: Fast-track predicate clearance. Standard predicate reliance. The short review cycle indicates strong predicate alignment - the FDA found sufficient equivalence without extended technical review.

View all Intermedics Orthopedics devices

Submission Details

510(k) Number K955778 FDA.gov
FDA Decision Cleared Substantially Equivalent - NSE Converted (SN)
Date Received December 20, 1995
Decision Date March 08, 1996
Days to Decision 79 days
Submission Type Traditional
Review Panel Orthopedic (OR)
Summary -
Third-party Review No - reviewed directly by FDA
Regulatory Context
Review time vs. panel average
43d faster than avg
Panel avg: 122d · This submission: 79d
Pathway characteristics
Predicate-based equivalence. No clinical trials required.

Device Classification

Product Code HRY Prosthesis, Knee, Femorotibial, Semi-constrained, Cemented, Metal/polymer
Device Class Class 2 - Special Controls
CFR Regulation 21 CFR 888.3530
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 Peers - HRY Prosthesis, Knee, Femorotibial, Semi-constrained, Cemented, Metal/polymer

All 51
Devices cleared under the same product code (HRY) and FDA review panel - the closest regulatory comparables to K955778.
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