# Codebook: FDA reports that mention a knee scooter or knee walker

Written before any report in the set was coded. Mobility Atlas study, October 2026.

## Pool
Every FDA MAUDE device report, under any product code, whose text contains "knee scooter", "knee scooters", "knee walker", "knee walkers" or "kneewalker", received at any date up to the latest openFDA update read on 19 October 2026.

## What you record for each report
One line per report: `report_key,device,problem,injury,fall,user,finding,note`

### DEVICE (one letter): what the report is about
- K: a KNEE SCOOTER OR KNEE WALKER is the device the event happened with (a wheeled frame with a knee pad and handlebar for a person keeping weight off one foot or lower leg).
- O: another device is the subject; a knee scooter is only mentioned (for example the user also owns one, or uses one later).
- N: no event.

### PROBLEM (one letter): what the report says went wrong FIRST (code the allegation even if the maker found no fault). If several apply, use the first in this list.
- S: STEERING OR HANDLEBAR: the steering column, handlebar, fork or stem loosened, turned, came off or broke; steering locked or did not steer.
- B: BRAKE: a hand brake or parking brake failed, did not hold, locked up or the cable broke.
- W: WHEEL, TIRE OR AXLE: a wheel, caster, tire, bearing or axle broke, came off, locked or wobbled.
- P: KNEE PAD OR PLATFORM: the knee pad, platform or its post came off, loosened, tilted, slid or broke.
- F: FRAME, FOLDING OR HEIGHT ADJUSTMENT: the frame, a weld, the folding joint or a height adjustment broke, collapsed or released.
- T: TIP OR FALL WITHOUT A FAULT: the scooter tipped or the user fell (turning, a curb, a slope, a bump, getting on or off) and no part is said to have failed.
- Q: a device problem is alleged but no part is named.
- X: an event is described but nothing failed and nothing above fits.
- N: no event.

### FLAGS (y or n)
- injury: harm to the body or medical care is stated (bruise, cut, fracture, re-injury of the foot, stitches, hospital, death; pain alone counts). y when the event type is Death.
- fall: the user fell or went to the ground.
- user: the report says the user or a third party caused it (misuse, wrong assembly, a part not tightened by the user, weight over the limit, a modification), as the cause or the maker's conclusion.

### FINDING (one letter): what the maker found
- D: a fault was found or confirmed, or a part was replaced because it was faulty.
- N: no fault found, worked as designed, or the cause was outside the device.
- X: not evaluated, not returned, or nothing stated.

### note
At most 15 words: device, problem, what made it hard. No quotes longer than 6 words. No personal details.

## Output format
CSV with header `report_key,device,problem,injury,fall,user,finding,note`, one row per report, nothing else.