# 📐  L2 Spec — Knee / Hip Osteoarthritis Kellgren-Lawrence Grading (PWDR) — Spec Skeleton

**ID:** `L2-527-001` · **Status:** ⊙ Testnet (genesis catalog)
**Parents:** ⬆ Principle [`L1-527`](/artifact/l1/L1-527)

> **🎯 Tolerance (ε):** expression
> **⚖ Difficulty score:** 0.5 · **Delta tier:** 5
> **⛓ On-chain block:** 41552981

---

## 1. Domain Ω

**Type:** `range`

| Parameter | Unit | Range |
|---|---|---|
| H | px | 1024 – 4096 |
| W | px | 1024 – 4096 |
| Kvp | — | [NEEDS_HAND_AUTHORING: bounds] |
| Mas | — | [NEEDS_HAND_AUTHORING: bounds] |
| View | — | [NEEDS_HAND_AUTHORING: bounds] |
| Snr db | dB | [NEEDS_HAND_AUTHORING: bounds] |
| Rotation artifact | — | [NEEDS_HAND_AUTHORING: bounds] |
| Pixel resolution um | µm | [NEEDS_HAND_AUTHORING: bounds] |
| Weight bearing state | — | [NEEDS_HAND_AUTHORING: bounds] |
| Joint positioning error | — | [NEEDS_HAND_AUTHORING: bounds] |
| Early oa subtle features | — | [NEEDS_HAND_AUTHORING: bounds] |
| Incidental chondrocalcinosis | — | [NEEDS_HAND_AUTHORING: bounds] |
| Manual grader inter rater kappa | — | [NEEDS_HAND_AUTHORING: bounds] |

## 2. Tolerance (ε)

**Type:** `fn`

```
0.75_accuracy
```

## 3. Difficulty

| Property | Value |
|---|---|
| Difficulty score | 0.5 |
| Delta tier | 5 |

## 4. Fingerprint

`5b31b990ca5e89c8921f7596da1539e1ad7d36d86e8bbe5166b29f4db39ad0d9`

## 5. On-chain Registration

- **Chain hash:** `0x41ceb868e6802a63caf18f3db49b932587f86aa3f5367d6750783147f4d5733e`
- **Chain tx hash:** `0x4ac669dacf3bf7d0c3fa4a17b8158de3343586d3dd33a2bfaa7c494d90f68663`
- **Chain block:** `41552981`

---

## File Mapping

This bundle consists of: `L2-527-001.md`, `L2-527-001.json`.

| File | Role | How to regenerate |
|------|------|-------------------|
| `L2-527-001.md` | Source of truth — edit this | Human or LLM |
| `L2-527-001.json` | Structured metadata for the registry | LLM regenerates from the sections above |

**Prompt for your LLM after editing this Markdown:**

> Read the attached Markdown. Regenerate the sibling `.json` so every field matches.
> Preserve the schema documented in the rows above.
> Output each file in its own fenced code block tagged with the filename.
> Output only the JSON object.

_This Markdown was auto-synthesized from the catalog row for `L2-527-001`._
_Edit it, regenerate the JSON, and submit at [/submit](/submit) to claim the artifact._