# Zimmer Biomet ROSA ONE Brain 3.1 Class I recall: software could drive instruments to a wrong trajectory revision history

Append-only Arc G field-change log. Forward-only honesty: events accrue from Arc G adoption.

Incident: [Zimmer Biomet ROSA ONE Brain 3.1 Class I recall: software could drive instruments to a wrong trajectory](/incidents/rosa-one-brain-trajectory-recall-2021.md)

## Recorded posture

- First recorded event: 2026-06-04
- Last material change: 2026-06-04
- Material event count: 1
- Editorial event count: 0

## Material events (1)

- **2026-06-04**: created (source: baseline:arc-g)

## Forward-only note

Arc G is forward-only. The event log accrues from the Arc G adoption point. Fields with no events post-baseline equal the current cached value and are not independently verified at any prior date.

_Canonical URL: /incidents/rosa-one-brain-trajectory-recall-2021/history. REST: /v1/incidents/186fb155-6c2e-4812-907c-fd241200cad9/history. HTML: [/incidents/rosa-one-brain-trajectory-recall-2021/history](/incidents/rosa-one-brain-trajectory-recall-2021/history)._