{
  "slug": "kitchen-knife-serious-hand-injury",
  "question": "What are the odds of a kitchen-knife cut serious enough to damage a tendon or nerve?",
  "quick_answer": "Knife injuries send about 434,000 Americans a year to the ER, two-thirds of them to a finger or thumb, and kitchen knives account for 36%. Cuts deep enough to sever a hand tendon or a finger nerve are far rarer: a rough estimate of 0.26% lifetime for kitchen knives, about 1 in 380, against about 1 in 30 for any ER-treated kitchen-knife injury.\n",
  "category": "health",
  "tags": [
    "household",
    "food"
  ],
  "no_reliable_estimate": false,
  "perceived": {
    "description": "Nearly everyone who cooks has nicked a finger, so the minor cut is a familiar, almost routine event. The deeper version, a slip that goes through to a tendon or a finger nerve and ends in a hand surgeon's operating room, is rarely thought about until it happens. No US survey asks how likely people think a disabling kitchen-knife injury is, so no perceived number is offered here; the intuition is simply that serious knife injuries belong to assaults and butchers, not to someone slicing an onion.\n",
    "kind": "intuition"
  },
  "native": {
    "display": "~4.4 knife-caused hand tendon or finger-nerve injuries per 100,000 people per year attributable to kitchen knives",
    "numerator": 4.4,
    "denominator": 100000,
    "unit": "per year",
    "population": "US population (tendon incidence from Olmsted County, MN, 2001-2010; nerve incidence from Stockholm adults, 2012-2018; kitchen share from US NEISS 1990-2008)"
  },
  "normalized": {
    "lifetime_us_adult": 0.0026,
    "display": "~1 in 380 lifetime",
    "log_value": -2.59,
    "assumptions": "Built from three pieces, each from a different source. (1) de Jong et al. found acute traumatic hand/wrist tendon injuries at 33.2 per 100,000 person-years in Olmsted County, MN (all ages); knife was the leading mechanism with 129 of 458 cases. Mechanism was not recorded in 40 cases, so the knife share is 28.2% of all cases or 30.9% of those with a recorded mechanism; about 30% is used. Knife-caused tendon injuries: 33.2 x 0.30 = about 10.0 per 100,000 per year. (2) Evertsson et al. found surgically repaired digital-nerve injuries at 8.3 per 100,000 adult person-years in Stockholm, 47% caused by a knife. 40% of their 1,004 patients also had a flexor tendon injury, and those patients would already be counted in a tendon rate, so only the 60% without one is added: 8.3 x 0.60 x 0.47 = about 2.3 per 100,000 (the knife share of this subgroup is not reported separately; the overall 47% is assumed). Any knife: 10.0 + 2.3 = about 12.3 per 100,000 per year. (3) Neither deep-injury study separates kitchen knives from pocket, utility, or work knives. The only available kitchen share is Smith et al.'s NEISS figure that cooking/kitchen knives were 36% of ER-treated knife injuries whose knife type was recorded, which is applied here: 12.3 x 0.36 = about 4.4 per 100,000 per year (annual probability ~0.000044). Lifetime over 59 adult years: 1 - (1 - 0.000044)^59 = about 0.0026 (~1 in 380). Bounds: the high end (0.01) covers the any-knife rate with no kitchen discount and no flexor-tendon discount on the nerve rate (10.0 + 8.3 x 0.47 = about 13.9 per 100,000; 1 - (1 - 0.000139)^59 = 0.0082), padded for the all-ages Olmsted rate understating an adult rate that peaks at ages 20-29. The low end (0.001) combines two downward pressures: de Jong's tendon rate fell during the study from 42.9 per 100,000 in 2002 to 24.1 in 2010, and the kitchen share of deep knife injuries could be nearer 20% than 36%. At the 2010 rate and a 20% share: (24.1 x 0.30 + 2.34) x 0.20 = ~1.9 per 100,000; 1 - (1 - 0.000019)^59 = ~0.0011. Fingertip amputations are not included because no source used here gives a knife-specific rate for them.\n",
    "uncertainty": {
      "low": 0.001,
      "high": 0.01
    },
    "scope": "us_adult_lifetime"
  },
  "sources": [
    {
      "url": "https://pubmed.ncbi.nlm.nih.gov/24900902/",
      "title": "The Incidence of Acute Traumatic Tendon Injuries in the Hand and Wrist: A 10-Year Population-based Study",
      "publisher": "Clinics in Orthopedic Surgery (de Jong et al., Mayo Clinic)",
      "source_type": "peer_reviewed",
      "statistic": "Acute traumatic hand/wrist tendon injuries: 33.2 per 100,000 person-years; knife was the most frequent mechanism (n = 129); age-adjusted 56.3 per 100,000 in males vs 10.7 in females",
      "excerpt": "\"During the 10-year study period there was an incidence rate of 33.2 injuries per 100,000 person-years.\" ... \"During the 10-year study period, 458 cases of acute traumatic tendon injuries of the hand and wrist were identified.\" ... \"A variety of mechanisms accounted for acute traumatic tendon injuries and included: knife (n = 129), glass or mirror (n = 71), any kind of saw (n = 68), crush injury (n = 27), degloving injury (n = 5), and bite injury (n = 3).\" ... \"Tendon injuries related to violence or physical altercations were seen in 27 cases (6.4%).\"\n",
      "source_date": "2014-06-01",
      "source_accessed": "2026-09-26",
      "calculation_notes": "Excerpt sentences checked on 2026-09-26 against the Europe PMC full text (PMC4040381). Knife share: 129 knife cases out of 458 (28.2%), or out of the 418 with a recorded mechanism (30.9%); ~30% is used. 33.2 x 0.30 = ~10.0 knife-caused tendon injuries per 100,000 per year. The age-adjusted sex split (56.3 male vs 10.7 female per 100,000) is for all mechanisms, not knives specifically, and is used only for the personal multipliers. The Olmsted rate includes all ages, and the highest incidence was at 20-29 years. Of the 27 violence-related cases, 10 involved a knife, so a few of the 129 knife cases are assaults rather than accidental cuts; the kitchen share in step (3) absorbs this only approximately.\n"
    },
    {
      "url": "https://pmc.ncbi.nlm.nih.gov/articles/PMC10081734/",
      "title": "Incidence, demographics and rehabilitation after digital nerve injury: A population-based study of 1004 adult patients in Sweden",
      "publisher": "PLOS One (Evertsson, Carlsson, Turesson, Ezer, Arner, Mellstrand Navarro)",
      "source_type": "peer_reviewed",
      "statistic": "Surgically repaired digital-nerve injury: 8.3 per 100,000 person-years (Stockholm adults, 2012-2018; the paper says isolated but computes incidence over all injured patients); knife caused 47%; a knife slipping while splitting an avocado caused 6% (n = 61); 40% had a concomitant flexor tendon injury",
      "excerpt": "\"From 2012 to 2018, 1004 patients with a surgically repaired digital nerve injury resident in the Stockholm region were identified in the Swedish national quality registry for hand surgery.\" ... \"The incidence rate of surgical repair of an isolated digital nerve injury was 8.3 per 100 000 person-years.\" ... \"The most common cause of injury was a knife (47%, n = 473), followed by glass (21%, n = 213).\" ... \"Concomitant flexor tendon injuries occurred in 398 patients (40%)\"\n",
      "source_date": "2023-04-07",
      "source_accessed": "2026-09-26",
      "calculation_notes": "Excerpt sentences were checked on 2026-09-26 against the Europe PMC full text of the open-access article. The methods state that \"Incidence was calculated as the number of injured patients divided by the population at risk\", and 1,004 patients over 7 years in a Stockholm adult population of roughly 1.8 million gives about 8 per 100,000, so the 8.3 covers the whole cohort, including the 398 patients (40%) with a concomitant flexor tendon injury, despite the word \"isolated\"; to avoid counting the same injury twice, only the 60% without a flexor tendon injury is added: 8.3 x 0.60 x 0.47 = ~2.3 knife-caused nerve-only repairs per 100,000 adult person-years. If the 8.3 is in fact restricted to isolated nerve injuries, as the wording says, the flexor-tendon cases are already excluded and the 0.60 discount subtracts them a second time; the knife-caused nerve rate would then be 8.3 x 0.47 = ~3.9 per 100,000 and the any-knife total ~13.9 rather than ~12.3. The headline keeps the discounted figure; normalized.uncertainty.high is set to cover the undiscounted any-knife case (~0.8% lifetime) with padding. Swedish rates are applied to the US without adjustment; this is a transfer assumption, not a measured US rate.\n",
      "independence_note": "Independent of the Olmsted County tendon study (different country, registry, and injury type). Nerve injuries with a concomitant flexor tendon injury (40%) are removed before the two rates are summed, to avoid double counting patients who would appear in both.\n"
    },
    {
      "url": "https://pubmed.ncbi.nlm.nih.gov/23849364/",
      "title": "Knife-related injuries treated in United States emergency departments, 1990-2008",
      "publisher": "Journal of Emergency Medicine (Smith et al., Center for Injury Research and Policy, Nationwide Children's Hospital)",
      "source_type": "peer_reviewed",
      "statistic": "~434,259 knife-related ER visits per year (1990-2008); fingers/thumbs 66%; lacerations 94%; pocket/utility knives 47%, cooking/kitchen knives 36%",
      "excerpt": "\"An estimated 8,250,914 (95% confidence interval [CI] 7,149,074-9,352,755) knife-related injuries were treated in US EDs from 1990 to 2008, averaging 434,259 (95% CI 427,198-441,322) injuries annually, or 1190 per day.\" ... \"Fingers/thumbs (66%; 5,447,467 of 8,249,410) were injured most often, and lacerations (94%; 7,793,487 of 8,249,553) were the most common type of injury.\" ... \"Pocket/utility knives were associated with injury most often (47%; 1,169,960 of 2,481,994), followed by cooking/kitchen knives (36%; 900,812 of 2,481,994).\"\n",
      "source_date": "2013-09-01",
      "source_accessed": "2026-09-26",
      "calculation_notes": "Abstract checked on 2026-09-26 via Europe PMC. The knife-type split is computed over the 2,481,994 injuries (about 30% of the total) where the knife type was recorded, so the 36% kitchen share assumes unrecorded cases split the same way. Context anchor: 434,259 / ~277 million (mean US population 1990-2008) = ~1.57 per 1,000 per year for any knife. Kitchen knives: 1.57 x 0.36 = ~0.56 per 1,000; lifetime 1 - (1 - 0.00056)^59 = ~3.3%, about 1 in 30 (an all-ages ER rate applied to adult years, so approximate). The 36% is also the kitchen share applied to the deep-injury rate in the headline.\n",
      "independence_note": "NEISS is a national probability sample of US emergency departments run by the Consumer Product Safety Commission; independent of both deep-injury cohorts.\n"
    },
    {
      "url": "https://pubmed.ncbi.nlm.nih.gov/35177285/",
      "title": "The Epidemiology of Hand and Finger Lacerations in United States Emergency Departments",
      "publisher": "Journal of Emergency Medicine",
      "source_type": "peer_reviewed",
      "statistic": "Knives were the product most linked to ER-treated hand and finger lacerations (30.5%), NEISS 2015-2019",
      "excerpt": "\"The top three products linked to hand and finger lacerations are knives (30.5%), metal containers (4.2%), and drinkware (3.8%).\" ... \"men are less likely to have injuries from these products than women, especially knives (odds ratio 0.76; 95% confidence interval 0.60-0.96; p < 0.02).\" ... \"Affected patients are frequently White (70.5%), male (63.4%), and aged 18 through 44 years (46.3%).\"\n",
      "source_date": "2022-06-01",
      "source_accessed": "2026-09-26",
      "calculation_notes": "Abstract checked on 2026-09-26 via Europe PMC. Not used in the headline arithmetic. Confirms with more recent NEISS data (2015-2019) that knives remain by far the leading product behind hand and finger lacerations, a factor of about seven above the next product. The odds ratio of 0.76 compares the share of lacerations caused by knives among male patients with that share among female patients; it is not an incidence ratio. Men are 63.4% of the patients, so back-solving from the 30.5% overall knife share gives roughly 28% of men's and 34% of women's lacerations caused by knives, and men still account for about 1.4 times as many knife-laceration visits as women. This is used only to temper the all-mechanism sex multipliers, not in the headline.\n"
    }
  ],
  "comparison_anchors": [
    {
      "label": "Any ER-treated kitchen-knife injury (lifetime, US)",
      "lifetime_us_adult": 0.033
    },
    {
      "label": "Injured by fireworks (lifetime, US)",
      "lifetime_us_adult": 0.0026
    },
    {
      "label": "Knife-involved aggravated assault (lifetime, US)",
      "lifetime_us_adult": 0.027
    }
  ],
  "personal_factor_multipliers": [
    {
      "factor": "Female",
      "multiplier": 0.32,
      "notes": "de Jong et al. (Olmsted County): age-adjusted hand/wrist tendon injury 10.7 per 100,000 in females vs 33.2 overall; the overall figure is age- and sex-adjusted. All mechanisms, not knife-specific. In the 2022 NEISS hand/finger laceration study, men made about 1.4 times as many knife-laceration ER visits as women (back-solved from its 63.4% male share and an odds ratio of 0.76 for knife as the cause), a much smaller gap than the all-cause tendon figures, so for kitchen knives the female discount is probably overstated."
    },
    {
      "factor": "Male",
      "multiplier": 1.7,
      "notes": "de Jong et al. (Olmsted County): age-adjusted 56.3 per 100,000 in males vs 33.2 overall; the overall figure is age- and sex-adjusted. All mechanisms, not knife-specific; men also dominate work and saw injuries. In the 2022 NEISS hand/finger laceration study, men made about 1.4 times as many knife-laceration ER visits as women (back-solved from its 63.4% male share and an odds ratio of 0.76 for knife as the cause), so the knife-only male excess probably exists but is smaller than 1.7x."
    }
  ],
  "short_label": "Kitchen knife tendon cut",
  "outcome_severity": "serious_harm",
  "exposure_pattern": "recurring",
  "outcome_type": "recoverable_injury",
  "valence": "negative",
  "caveats": "The headline stitches together three studies from different places and decades: a Minnesota county's tendon injuries (2001-2010), Stockholm's repaired digital-nerve injuries (2012-2018), and a US ER sample of knife injuries (1990-2008). No study located here counts tendon or nerve injuries caused specifically by kitchen knives during food preparation, so the 36% kitchen share from ER data (itself computed only over the 30% of ER visits where knife type was recorded) is borrowed and applied to deep injuries; if kitchen knives make up a larger share of deep home cuts than of all ER-treated knife injuries, the true figure is higher, and the upper bound (1%) assumes every knife-caused tendon or nerve injury counts and that the Stockholm nerve rate needs no double-counting discount. The Olmsted tendon rate covers all ages, while the lifetime window is adult years only; since incidence peaks at ages 20-29, the adult rate is probably somewhat higher. Nerve injuries that came with a flexor tendon injury (40% in Stockholm) are removed to avoid double counting, but nerve injuries alongside an extensor tendon injury cannot be separated and may still be counted twice. Fingertip amputations and injuries treated only as outpatients without surgery may be missed. The excerpts were checked on 2026-09-26 against Europe PMC full text (de Jong, Evertsson) or abstracts (both NEISS studies). Only two personal multipliers are given, both for sex and both for all-mechanism tendon injuries. The 2022 NEISS laceration data point the same way but more weakly: a smaller share of men's hand lacerations are knife cuts, yet men still make about 1.4 times as many knife-laceration ER visits as women, so the knife-specific sex gap is probably narrower than 1.7x versus 0.32x. Fewer than three factors are given because no source reachable here quantifies the effect of age, knife type, cutting technique or alcohol on knife-specific deep hand injuries as a rate ratio; de Jong reports the highest crude incidence at ages 20-29 but does not give it for knife injuries alone. The Olmsted tendon rate also fell during the study, from 42.9 per 100,000 in 2002 to 24.1 in 2010; the headline uses the decade average, so if the decline continued the current rate is lower, which is why the low bound sits at 0.1%.\n",
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    "scored_at": "2026-09-27",
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  "reviewer": "8d-eval-2026-09-27",
  "last_reviewed": "2026-09-27",
  "reviewed": true,
  "generated_at": "2026-09-26",
  "image": {
    "alt": "A chef's knife beside a halved onion on a wooden cutting board, flat vector illustration in muted tones."
  },
  "attribution": "Likelier — https://likelier.app",
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