{"uid":"cap_SM_F4d8EoHS2CiOyxvl_S","slug":"hevesi-2019-rip-score-calculator-e3263038","name":"Hevesi 2019 RIP Score Calculator","description":"Hevesi 2019 Recurrent Instability of the Patella (RIP) after first-time dislocation. Age <25 scores 2; skeletal immaturity / open physes 1; trochlear dysplasia Dejour A–D (caller-assigned present) 1; TT-TG/PL ratio ≥0.5 scores 1. Max 5. Bands 0–1 low, 2–3 intermediate, 4+ high (10-year recurrent instability 0.0%, 30.6%, 79.2%). Not a surgical order. Not Balcarek 2013 or later PIP models. magent does not read radiographs.","url":"https://api.magentlab.com/api/calc/rip","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET","HEAD","DELETE"],"type":"string"},"headers":{"type":"object","additionalProperties":{"type":"string"}},"queryParams":{"type":"object","required":["age","skeletal_immature","trochlear_dysplasia","tt_tg_pl_ratio"],"properties":{"age":{"type":"integer","description":"Age in years (integer 8-80; magent clamp, not a published range). Hevesi 2019: age <25 → 2 points; age ≥25 → 0. magent does not assign age."},"tt_tg_pl_ratio":{"type":"number","description":"Caller-assigned tibial tubercle–trochlear groove / patellar length (TT-TG/PL) ratio (Hevesi 2019). ≥0.5 inclusive scores 1. Magent clamp 0.1-2.0, not a published range. magent does not measure TT-TG or patellar length."},"skeletal_immature":{"type":"boolean","description":"Caller-assigned skeletal immaturity / open physes (Hevesi 2019). true scores 1. magent does not read radiographs or assign physeal status. true or false."},"trochlear_dysplasia":{"type":"boolean","description":"Caller-assigned trochlear dysplasia Dejour A–D present (Hevesi 2019). true scores 1. magent does not grade trochlea or read radiographs. true or false."}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.005","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.005/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_ReVJIHbcC6OpGZ5ZI7inL","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.005","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Computes the Recurrent Instability of the Patella (RIP) score per Hevesi 2019 from caller-supplied age, skeletal maturity, trochlear dysplasia status, and TT-TG/PL ratio, returning a total score and risk band.","exampleAgentPrompt":"Calculate the Hevesi 2019 RIP score for a 22-year-old patient with open physes, trochlear dysplasia present, and a TT-TG/PL ratio of 0.55 — they just had their first patellar dislocation.","exampleUseCases":[{"title":"Adolescent first patellar dislocation triage","prompt":"My 17-year-old patient just had their first patellar dislocation. They have open physes, I'm classifying trochlear dysplasia as present (Dejour B), and the TT-TG/PL ratio I measured is 0.6. Can you run the Hevesi RIP score and tell me their 10-year recurrence risk band?"},{"title":"Adult low-risk instability check","prompt":"I have a 30-year-old with a first-time patella dislocation, skeletally mature, no trochlear dysplasia, and a TT-TG/PL ratio of 0.35. What does the 2019 Hevesi RIP model give them for recurrent instability risk?"},{"title":"High-risk young athlete documentation","prompt":"Document the RIP score for a 19-year-old athlete — skeletally immature, trochlear dysplasia present, TT-TG/PL ratio is 0.52 — so I can include it in the surgical consultation note."}],"resultDescription":"Returns the Hevesi 2019 RIP total score (integer 0–5), the corresponding risk band (low 0–1, intermediate 2–3, high 4–5), and the published 10-year recurrent instability probability (0.0%, 30.6%, or 79.2%) associated with that band. Does not include imaging interpretation or surgical recommendations.","failureModes":["Missing required query parameters (age, skeletal_immature, trochlear_dysplasia, tt_tg_pl_ratio) returns a 400 error","Age outside clamped range 8–80 may be rejected or clamped by the service","TT-TG/PL ratio outside clamped range 0.1–2.0 may be rejected or clamped","Non-integer age value returns a validation error","Incorrect boolean format for skeletal_immature or trochlear_dysplasia causes a parsing error","Payment failure (x402 protocol) prevents the call from completing"],"whenToPreferThis":"Use this endpoint when you need to apply the Hevesi 2019 RIP scoring rule specifically — not the Balcarek 2013 rule or other patellar instability prediction models. Ideal for automating orthopedic clinical documentation after a first-time patellar dislocation where the clinician has already assigned trochlear dysplasia grade and measured TT-TG/PL ratio. Note that this endpoint does not interpret imaging; callers must supply all inputs from their own assessment.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T06:56:11.499Z","isFirstParty":false}