# Hip RAPID score (Hevesi)

RAPID hip

Status: LIVE
Price: $0.005 USDC
`GET /api/calc/rapid_hip`
HTML: https://magentlab.com/docs/rapid-hip
Markdown: https://magentlab.com/docs/rapid-hip.md

Not a medical device. Not a diagnosis, dose, or listing recommendation.

## What it computes

Sum the Hevesi 2018 RAPID points from sex, Tonnis grade, and cam morphology and return the published low, intermediate, or high band.

## When to use

When an agent already has sex, Tonnis grade 0-2, and a caller-assigned cam flag for hip arthroscopy counseling and must not invent a diagnosis or operative plan.

## When not to use

- Not a medical device. Not a diagnosis, ALAD grade, or operative plan. magent does not read radiographs or measure alpha angle.
- Hevesi 2018 hip RAPID only (acetabular chondrolabral disruption). Not Rahman 2014 RAPID for pleural infection.
- Age is not in the score (univariate only in the paper). Tonnis grade 3 is not scored. Cam is a caller-assigned flag (paper univariate used alpha angle >55°).
- Published high-grade (ALAD 3-4) damage rates are returned only for score 0 (10.5%) and score 5 (88.0%). Scores 1-4 omit that field; do not treat cohort share as damage risk.

## Formula

```
RAPID = sex_points + tonnis_points + cam_points; female 0 male 1; Tonnis 0=0, 1=2, 2=3; cam present 1; max 5; bands 0-1 low, 2-3 intermediate, 4-5 high (Hevesi 2018 Table 3 / Figure 2)
```

## Citation

[The Rapidly Assessed Predictor of Intraoperative Damage (RAPID) Score: An In-Clinic Predictive Model for High-Grade Acetabular Chondrolabral Disruption](https://doi.org/10.1177/2325967118799068)
Hevesi M, Hartigan DE, Wu IT, et al.
Orthop J Sports Med. 2018;6(10):2325967118799068
DOI: [10.1177/2325967118799068](https://doi.org/10.1177/2325967118799068)

## Worked example

### Female, Tonnis 0, no cam

Given: `cam_morphology=false, sex=female, tonnis_grade=0`

1. female → 0; Tonnis 0 → 0; cam absent → 0
2. score = 0
3. risk_band low; high-grade damage 10.5%


### Male, Tonnis 2, cam present

Given: `cam_morphology=true, sex=male, tonnis_grade=2`

1. male → 1; Tonnis 2 → 3; cam present → 1
2. score = 5
3. risk_band high; high-grade damage 88.0%


## Also searched as

- hip RAPID
- Hevesi RAPID
- acetabular RAPID
- RAPID chondrolabral
- Rapidly Assessed Predictor of Intraoperative Damage
- Hevesi 2018 RAPID
- hip arthroscopy RAPID
- Tonnis RAPID hip
- cam morphology RAPID

## Parameters

- `sex` (string, required): female or male (Hevesi 2018 Table 3). Male scores 1; female scores 0.
- `tonnis_grade` (integer, required): Caller-assigned Tonnis osteoarthritis grade 0, 1, or 2 (Hevesi 2018 Table 3). Grade 0 scores 0; grade 1 scores 2; grade 2 scores 3. Grade 3 is invalid (the derivation had no grade 3). magent does not read radiographs.
- `cam_morphology` (boolean, required): Caller-assigned cam morphology. true scores 1; false scores 0. Paper univariate used alpha angle >55°; magent does not measure alpha angle. true or false.

## Bulk (POST)

POST the same path with a JSON items array. The first item is the GET unit; each additional item is $0.002. Invalid items return HTTP 400 before settlement.

Method: `POST /api/calc/rapid_hip`
Max items: 25
Price: unit_amount + extra_item_amount * (n - 1) (unit 5000 atomic, extra 2000 atomic)
Status: PREVIEW

- 1 to 25 items. Each item uses the same keys as the GET query parameters.
- POST of 1 item costs the same as GET. Lists longer than 25: chunk into multiple POSTs. Extra items still execute; do not pad dummy rows.
- The first invalid item fails the whole request (index in the 400 JSON). You are not charged.
- HTTP 200 is {count, path, items}. Each items[i] is the GET 200 body for that row.
- Catalog misses (empty matches, found=false) stay paid 200s inside that slot.
- x402 resource URL is this path plus n and body_sha256. Browsers that prefer text/html get the same paywall as GET; Pay retries POST with the same items.

Example request:

```json
{
  "items": [
    {
      "cam_morphology": "false",
      "sex": "female",
      "tonnis_grade": "0"
    },
    {
      "cam_morphology": "false",
      "sex": "female",
      "tonnis_grade": "0"
    }
  ]
}
```

Human paywall (two-item fixture): https://api.magentlab.com/paywall/bulk/rapid-hip

Example 200:

```json
{
  "count": 2,
  "path": "/api/calc/rapid_hip",
  "items": [
    {
      "components": [
        {
          "value": "female",
          "factor": "sex",
          "points": 0,
          "present": false
        },
        {
          "value": 0,
          "factor": "tonnis_grade",
          "points": 0,
          "present": false
        },
        {
          "factor": "cam_morphology",
          "points": 0,
          "present": false
        }
      ],
      "disclaimer": "Not a medical device. Deterministic published-formula or published-code output for autonomous agents. A licensed clinician remains responsible for patient care and billing submissions.",
      "citation": {
        "authors": "Hevesi M, Hartigan DE, Wu IT, et al.",
        "doi": "10.1177/2325967118799068",
        "id": "hevesi-2018",
        "pmid": "30302348",
        "source": "Orthop J Sports Med. 2018;6(10):2325967118799068",
        "title": "The Rapidly Assessed Predictor of Intraoperative Damage (RAPID) Score: An In-Clinic Predictive Model for High-Grade Acetabular Chondrolabral Disruption"
      },
      "formula": "rapid_hip",
      "formula_expression": "RAPID = sex_points + tonnis_points + cam_points; female 0 male 1; Tonnis 0=0, 1=2, 2=3; cam present 1; max 5; bands 0-1 low, 2-3 intermediate, 4-5 high (Hevesi 2018 Table 3 / Figure 2)",
      "max_score": 5,
      "score": 0,
      "risk_band": "low",
      "sex": "female",
      "cam_morphology": false,
      "tonnis_grade": 0,
      "high_grade_damage_percent": 10.5
    },
    {
      "components": [
        {
          "value": "female",
          "factor": "sex",
          "points": 0,
          "present": false
        },
        {
          "value": 0,
          "factor": "tonnis_grade",
          "points": 0,
          "present": false
        },
        {
          "factor": "cam_morphology",
          "points": 0,
          "present": false
        }
      ],
      "disclaimer": "Not a medical device. Deterministic published-formula or published-code output for autonomous agents. A licensed clinician remains responsible for patient care and billing submissions.",
      "citation": {
        "authors": "Hevesi M, Hartigan DE, Wu IT, et al.",
        "doi": "10.1177/2325967118799068",
        "id": "hevesi-2018",
        "pmid": "30302348",
        "source": "Orthop J Sports Med. 2018;6(10):2325967118799068",
        "title": "The Rapidly Assessed Predictor of Intraoperative Damage (RAPID) Score: An In-Clinic Predictive Model for High-Grade Acetabular Chondrolabral Disruption"
      },
      "formula": "rapid_hip",
      "formula_expression": "RAPID = sex_points + tonnis_points + cam_points; female 0 male 1; Tonnis 0=0, 1=2, 2=3; cam present 1; max 5; bands 0-1 low, 2-3 intermediate, 4-5 high (Hevesi 2018 Table 3 / Figure 2)",
      "max_score": 5,
      "score": 0,
      "risk_band": "low",
      "sex": "female",
      "cam_morphology": false,
      "tonnis_grade": 0,
      "high_grade_damage_percent": 10.5
    }
  ]
}
```

## Response fields

- `formula` (string): rapid_hip
- `formula_expression` (string): Exact expression used
- `score` (integer): Hevesi 2018 RAPID points 0-5
- `max_score` (integer): Always 5
- `risk_band` (string): Figure 2 band: low (0-1), intermediate (2-3), or high (4-5)
- `high_grade_damage_percent` (number): Published high-grade (ALAD 3-4) damage rate: 10.5 at score 0 and 88.0 at score 5. Omitted for scores 1-4 (no published rate).
- `sex` (string): Sex used: female or male
- `tonnis_grade` (integer): Tonnis grade used (0, 1, or 2)
- `cam_morphology` (boolean): Whether caller-assigned cam morphology was scored
- `components` (array): Per-factor points
- `citation` (object): Hevesi et al. OJSM 2018 citation
- `disclaimer` (string): Not-a-device notice

## Example JSON

Frozen fixture. Not a live lookup.

```json
{
  "components": [
    {
      "value": "female",
      "factor": "sex",
      "points": 0,
      "present": false
    },
    {
      "value": 0,
      "factor": "tonnis_grade",
      "points": 0,
      "present": false
    },
    {
      "factor": "cam_morphology",
      "points": 0,
      "present": false
    }
  ],
  "disclaimer": "Not a medical device. Deterministic published-formula or published-code output for autonomous agents. A licensed clinician remains responsible for patient care and billing submissions.",
  "citation": {
    "authors": "Hevesi M, Hartigan DE, Wu IT, et al.",
    "doi": "10.1177/2325967118799068",
    "id": "hevesi-2018",
    "pmid": "30302348",
    "source": "Orthop J Sports Med. 2018;6(10):2325967118799068",
    "title": "The Rapidly Assessed Predictor of Intraoperative Damage (RAPID) Score: An In-Clinic Predictive Model for High-Grade Acetabular Chondrolabral Disruption"
  },
  "formula": "rapid_hip",
  "formula_expression": "RAPID = sex_points + tonnis_points + cam_points; female 0 male 1; Tonnis 0=0, 1=2, 2=3; cam present 1; max 5; bands 0-1 low, 2-3 intermediate, 4-5 high (Hevesi 2018 Table 3 / Figure 2)",
  "max_score": 5,
  "score": 0,
  "risk_band": "low",
  "sex": "female",
  "cam_morphology": false,
  "tonnis_grade": 0,
  "high_grade_damage_percent": 10.5
}
```

## Errors

- HTTP 400 `invalid_sex`: sex must be female or male Returned before settlement; you are not charged.
- HTTP 400 `invalid_tonnis`: tonnis_grade must be 0, 1, or 2 (Hevesi 2018 RAPID; grade 3 is not scored). Returned before settlement; you are not charged.
- HTTP 400 `invalid_flag`: boolean clinical flags must be true or false Returned before settlement; you are not charged.
- HTTP 400 `invalid_items`: POST body must be a JSON object with only an items array Returned before settlement; you are not charged.
- HTTP 400 `invalid_item_count`: items must be an array of 1 to 25 objects Returned before settlement; you are not charged.
- HTTP 400 `invalid_item`: each items entry must be a JSON object Returned before settlement; you are not charged.

Shared HTTP 402 and 503: https://magentlab.com/docs/payments

## Related tools

- [NHFS](https://magentlab.com/docs/nhfs) — Sum the Maxwell 2008 Nottingham hip fracture score from seven preoperative variables and return the integer total (max 10).
- [Mirels](https://magentlab.com/docs/mirels) — Sum the Mirels 1989 score for diagnosing impending pathologic fractures in long-bone metastatic disease from four caller-assigned items and return the published 4–12 integer total and band (≤7 / 8 / ≥9). Not an operative order and not SINS.

## Payment

Unpaid requests return HTTP 402 even if query parameters or POST items are missing or invalid, so CDP and agents can index the path. After a PAYMENT-SIGNATURE, invalid params return HTTP 400 JSON before settlement. magent does not charge. Fix the params, then request a new 402 quote for that complete URL. Catalog misses (empty matches, found=false) are valid paid 200s.

- GET the tool with Accept: application/json (do not send Accept: text/html unless you want the human paywall).
- HTTP 402 means you have not paid. Decode the base64 PAYMENT-REQUIRED header. HTTP 503 is not a new quote.
- Sign accepts[0] (exact, EIP-3009) with validBefore = now + maxTimeoutSeconds (600 seconds), or accepts[1] (batch-settlement deposit/voucher) on product GET. Ping and POST {items} stay exact. Magent retries transient facilitator 429/5xx before answering.
- Retry the same URL with PAYMENT-SIGNATURE (base64 JSON of accepted and payload). Magent attaches canonical extensions.bazaar on CDP verify/settle; echoing 402 bazaar is optional.
- Success is HTTP 200 JSON plus PAYMENT-RESPONSE. exact settles before the tool. batch-settlement verifies (and deposit-settles) before the tool and commits the charge after HTTP 2xx. HTTP 503: retry the same PAYMENT-SIGNATURE. Mint a new exact nonce only after a new HTTP 402.

- offered `exact` on eip155:8453: Fixed-price USDC on Base. The buyer authorizes the advertised amount (EIP-3009). magent settles before the tool runs (paymentFlow upfront). extra.assetTransferMethod=eip3009 extra.paymentFlow=upfront.
- offered `batch-settlement` on eip155:8453: Payment-channel vouchers claimed later in batches. Exact stays accepts[0]. Same-path POST {items} is still exact. extra.assetTransferMethod=eip3009 extra.paymentFlow=authorization.

- not offered `upto`: Not offered. Usage-based: buyer authorizes a ceiling, seller settles the actual amount after work. Reserved for a future metered tool. Not for current calculators or code search.

Same-path POST {items} is still scheme exact: one EIP-3009 authorization for GET unit plus $0.002 per extra item. That is not x402 batch-settlement (payment channels / vouchers).

Shared HTTP 402 and 503 table: https://magentlab.com/docs/payments

Stdio MCP (one process per host): https://magentlab.com/docs/mcp

## Guarantees

- HTTP 402 is unpaid, including a missing query. After PAYMENT-SIGNATURE, invalid parameters return HTTP 400 before settlement. You are not charged. HTTP 402 never includes the tool JSON.
- exact: settlement finishes before the tool (paymentFlow upfront). batch-settlement: verify/deposit before the tool; chargedCumulativeAmount commits after HTTP 2xx. Uncertain or failed settlement fails closed (HTTP 503). Retry the same PAYMENT-SIGNATURE.
- HTTP 402 is unpaid only. Do not sign a second authorization because of a 503.
- Execution is timeout-bounded and concurrency-capped.
- Calculator inputs are stored encrypted for allowlisted operators (Magent Console). They are not in public logs, SSH lookups, catalog, or rollups. Request logs store path without query.