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[[File:Hematomasubungual.png|thumb|Subungal haematoma of a toe]] |
[[File:Hematomasubungual.png|thumb|Subungal haematoma of a toe]] |
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A '''subungual hematoma''' is a collection of [[blood]] ([[hematoma]]) underneath a [[Nail (anatomy)|toenail or fingernail]] |
A '''subungual hematoma''' is a collection of [[blood]] ([[hematoma]]) underneath a [[Nail (anatomy)|toenail or fingernail]]. It can be extremely painful for an injury of its size, although otherwise it is not a serious medical condition. |
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==Nature== |
==Nature== |
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A [[wound|laceration]] of the [[nail (anatomy)#Parts of the nail|nail bed]] causes bleeding into the constricted area underneath the hard [[nail plate]].<ref>{{cite book |vauthors=Selbst SM, Attia M |title=Textbook Of Pediatric Emergency Medicine |publisher=Lippincott Williams & Wilkins |location=Hagerstown, MD |year=2006 |isbn=978-0-7817-5074-5 |page=1571 |chapter=Lacerations}}</ref> The blood pools under the nail, giving a reddish, brownish, blueish, or grey/blackish discoloration. The blood puts pressure to the nailbed causing pain which can be throbbing in quality and disappears when the pressure on the nail bed is relieved.<ref>{{Cite book|url=https://www.ncbi.nlm.nih.gov/books/NBK482508/ |title = Subungual Hematoma Drainage - StatPearls - NCBI Bookshelf| year=2022 | pmid=29494114 | last1=Pingel | first1=C. | last2=McDowell | first2=C. | chapter=Subungual Hematoma Drainage | publisher=StatPearls }}</ref> |
A [[wound|laceration]] of the [[nail (anatomy)#Parts of the nail|nail bed]] causes bleeding into the constricted area underneath the hard [[Nail (anatomy)|nail plate]].<ref>{{cite book |vauthors=Selbst SM, Attia M |title=Textbook Of Pediatric Emergency Medicine |publisher=Lippincott Williams & Wilkins |location=Hagerstown, MD |year=2006 |isbn=978-0-7817-5074-5 |page=1571 |chapter=Lacerations}}</ref> The blood pools under the nail, giving a reddish, brownish, blueish, or grey/blackish discoloration. The blood puts pressure to the nailbed causing pain which can be throbbing in quality and disappears when the pressure on the nail bed is relieved.<ref>{{Cite book|url=https://www.ncbi.nlm.nih.gov/books/NBK482508/ |title = Subungual Hematoma Drainage - StatPearls - NCBI Bookshelf| year=2022 | pmid=29494114 | last1=Pingel | first1=C. | last2=McDowell | first2=C. | chapter=Subungual Hematoma Drainage | publisher=StatPearls }}</ref> |
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Subungual hematomas typically heal without incident, though [[infection]] may occur. The pressure of the blood blister may cause separation of [[nail plate]] from the [[Matrix (nail)|nail bed]] ([[onycholysis]]), but the nail should not be pulled off, as this can cause scarring of the nailbed and deformed nails.<ref name=cleveland>{{cite web |title=3 Tips to Protect Your Toenails If You're a Hard-Core Runner |url=https://health.clevelandclinic.org/3-tips-protect-toenails-youre-hard-core-runner/ |website=Health Essentials from Cleveland Clinic |date=3 December 2015}}</ref> Nail discolouration may last some months.<ref name=marathon/> |
Subungual hematomas typically heal without incident, though [[infection]] may occur. The pressure of the blood blister may cause separation of [[Nail (anatomy)|nail plate]] from the [[Matrix (nail)|nail bed]] ([[onycholysis]]), but the nail should not be pulled off, as this can cause scarring of the nailbed and deformed nails.<ref name=cleveland>{{cite web |title=3 Tips to Protect Your Toenails If You're a Hard-Core Runner |url=https://health.clevelandclinic.org/3-tips-protect-toenails-youre-hard-core-runner/ |website=Health Essentials from Cleveland Clinic |date=3 December 2015}}</ref> Nail discolouration may last some months.<ref name=marathon/> |
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The nail plate may also become thicker and more brittle as a result of the injury ([[Onychauxis|onychochauxis]]). The deformed nail plate will gradually grow out and be replaced by new, normal-appearing |
The nail plate may also become thicker and more brittle as a result of the injury ([[Onychauxis|onychochauxis]]). The deformed nail plate will gradually grow out and be replaced by a new, normal-appearing one in several months' time. Infrequently, the nail may become painful and require surgical drainage.<ref name=statpearls>{{cite journal |last1=Pingel |first1=C |last2=McDowell |first2=C |title=Subungual Hematoma Drainage |date=January 2019 |pmid=29494114 |journal=StatPearls [Internet] |url=https://www.ncbi.nlm.nih.gov/books/NBK482508/}}</ref> |
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==Causes== |
==Causes== |
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[[File:Preventing black toenail subungual hematoma.svg|thumb|left| |
[[File:Preventing black toenail subungual hematoma.svg|thumb|left|Right: Shoe is loose, slides. Center: Too little [[Ease (sewing)|ease]] for foot to extend. Left: Proper fit]] |
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[[File:Runners_toe.jpg|thumb|A foot which has lost a toenail, due to running injuries exacerbated by poorly-fitting shoes, badly-cut nails, and mild [[Morton's toe]]]] |
[[File:Runners_toe.jpg|thumb|A foot which has lost a toenail, due to running injuries exacerbated by poorly-fitting shoes, badly-cut nails, and mild [[Morton's toe]]]] |
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The condition is caused by a [[Physical trauma|traumatic injury]], such as slamming a [[finger]] in a door,<ref>{{cite web |title=Subungual Hematoma: Care Instructions |url=https://myhealth.alberta.ca/Health/aftercareinformation/pages/conditions.aspx?hwid=zc1301 |website=myhealth.alberta.ca}}</ref> or from sports activities, especially those involving sudden accelerations, such as soccer, basketball, and tennis, or going downhill, such as running or hiking rugged terrain, |
The condition is caused by a [[Physical trauma|traumatic injury]], such as slamming a [[finger]] in a door,<ref>{{cite web |title=Subungual Hematoma: Care Instructions |url=https://myhealth.alberta.ca/Health/aftercareinformation/pages/conditions.aspx?hwid=zc1301 |website=myhealth.alberta.ca}}</ref> or from sports activities, especially those involving sudden accelerations, such as soccer, basketball, and tennis, or going downhill, such as running or hiking rugged terrain, and ill-fitting footwear.<ref name=marathon/><ref name=cleveland/><ref name=usmilit />{{rp|52,135}} |
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Repeatedly thrusting the toes against a shoe's [[toe box]] can cause a subungual hematoma called jogger's toe,<ref>{{cite journal |pages=498–501 |doi=10.1136/bjsm.2004.011874 |title=The wear and tear of 26.2: dermatological injuries reported on marathon day |year=2004 |last1=Mailler |first1=E A |journal=British Journal of Sports Medicine |volume=38 |issue=4 |pmid=15273194 |last2=Adams |first2=BB |pmc=1724877}}</ref> runner's toe, or black toenail. In a marathon, several percent of [[Running|runners]] may be affected.<ref name=marathon/> Wearing footwear which fits helps prevent runner's toe.<ref name=marathon/> |
Repeatedly thrusting the toes against a shoe's [[toe box]] can cause a subungual hematoma called jogger's toe,<ref>{{cite journal |pages=498–501 |doi=10.1136/bjsm.2004.011874 |title=The wear and tear of 26.2: dermatological injuries reported on marathon day |year=2004 |last1=Mailler |first1=E A |journal=British Journal of Sports Medicine |volume=38 |issue=4 |pmid=15273194 |last2=Adams |first2=BB |pmc=1724877}}</ref> runner's toe, or black toenail. In a marathon, several percent of [[Running|runners]] may be affected.<ref name=marathon/> Wearing footwear which fits helps prevent runner's toe.<ref name=marathon/> |
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Separately, if there is not enough space around the toes, the toes will also hit the toebox repeatedly.<ref name=marathon/> Feet become longer and wider when weight is put on them, because the arches flatten, and the toes also splay and bend.<ref name=usmilit>{{cite book |last1=Munson |first1=Edward Lyman |title=The soldier's foot and the military shoe; a handbook for officers and noncommissioned officers of the line |date=1912 |location=Menasha, Wis.|publisher=Press of the George Banta publishing company |url=https://archive.org/details/soldiersfootmili00munsrich}} (this is the publication of a four-year review into the footwear of the US military by the Army Shoe Board, of which [[Edward Lyman Munson|the author]], a physician and senior officer of the [[United States Army Medical Corps]], is president.</ref>{{rp|p15,18,72–73}} At the end of a long journey on foot, the arches flatten, the metatarsals spread, and the foot swells more than after a short one.<ref name=usmilit />{{rp|52}} The toes also need vertical space; a toe cap which is low enough to press on the top of the toe may also cause bruising under the nail, especially if the toe cap is stiff. If the toebox is pointed, the toes may be wedged forwards into the area with inadequate height.<ref name=usmilit />{{rp|52–53,135}} |
Separately, if there is not enough space around the toes, the toes will also hit the toebox repeatedly.<ref name=marathon/> Feet become longer and wider when weight is put on them, because the arches flatten, and the toes also splay and bend.<ref name=usmilit>{{cite book |last1=Munson |first1=Edward Lyman |title=The soldier's foot and the military shoe; a handbook for officers and noncommissioned officers of the line |date=1912 |location=Menasha, Wis.|publisher=Press of the George Banta publishing company |url=https://archive.org/details/soldiersfootmili00munsrich}} (this is the publication of a four-year review into the footwear of the US military by the Army Shoe Board, of which [[Edward Lyman Munson|the author]], a physician and senior officer of the [[United States Army Medical Corps]], is president.</ref>{{rp|p15,18,72–73}} At the end of a long journey on foot, the arches flatten, the metatarsals spread, and the foot swells more than after a short one.<ref name=usmilit />{{rp|52}} The toes also need vertical space; a toe cap which is low enough to press on the top of the toe may also cause bruising under the nail, especially if the toe cap is stiff. If the toebox is pointed, the toes may be wedged forwards into the area with inadequate height.<ref name=usmilit />{{rp|52–53,135}} |
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Toenails which protrude unevenly may concentrate force on the toenail; [[ingrown toenail|properly-cut nails]] are therefore also important.<ref name=marathon>{{cite journal |last1=Mailler |first1=EA |last2=Adams |first2=BB |title=The wear and tear of 26.2: dermatological injuries reported on marathon day. |journal=British Journal of Sports Medicine |date=August 2004 |volume=38 |issue=4 |pages=498–501 |doi=10.1136/bjsm.2004.011874 |pmid=15273194 |pmc=1724877 }}</ref> |
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Some susceptible runners may also have [[Morton's toe]]. In this variant of human foot anatomy, the second toe extends further out than the [[Hallux|great toe]]. This can make it harder to find shoes with adequate space around the toes.{{citation needed|date=January 2020}} |
Some susceptible runners may also have [[Morton's toe]]. In this variant of human foot anatomy, the second toe extends further out than the [[Hallux|great toe]]. This can make it harder to find shoes with adequate space around the toes.{{citation needed|date=January 2020}} |
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Subungual hematomas can resolve on their own, without treatment being necessary.<ref name=marathon/> If they are acutely painful,<ref name=2012_review>{{cite journal |last1=Dean |first1=B |last2=Becker |first2=G |last3=Little |first3=C |title=The management of the acute traumatic subungual haematoma: a systematic review |journal=Hand Surgery |date=2012 |volume=17 |issue=1 |pages=151–4 |doi=10.1142/S021881041230001X |pmid=22351556}}</ref> they may be drained.<ref name=statpearls /> |
Subungual hematomas can resolve on their own, without treatment being necessary.<ref name=marathon/> If they are acutely painful,<ref name=2012_review>{{cite journal |last1=Dean |first1=B |last2=Becker |first2=G |last3=Little |first3=C |title=The management of the acute traumatic subungual haematoma: a systematic review |journal=Hand Surgery |date=2012 |volume=17 |issue=1 |pages=151–4 |doi=10.1142/S021881041230001X |pmid=22351556}}</ref> they may be drained.<ref name=statpearls /> |
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Subungual hematomas are treated by either making a hole through the nail into the hematoma ([[Trepanation|trephining]]) within 48 hours of injury, draining the blood and releasing the pressure,<ref name=statpearls/> or, less conservatively, |
Subungual hematomas are treated by either making a hole through the nail into the hematoma ([[Trepanation|trephining]]) within 48 hours of injury, draining the blood and releasing the pressure,<ref name=statpearls/> or, less conservatively, by removing the entire nail.<ref>{{cite web|author=<!--Staff writer(s); no by-line.-->|title=Primary Care Procedures: Trephination of Subungual Hematoma|url=http://www.consultantlive.com/skin-diseases/primary-care-procedures-trephination-subungual-hematoma|archive-url=https://web.archive.org/web/20160821165953/http://www.consultantlive.com/skin-diseases/primary-care-procedures-trephination-subungual-hematoma|archive-date=21 August 2016|access-date=30 July 2016|website=consultantlive|publisher=UBM Medica, LLC}}</ref> |
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In hospital or medical setting, trephining is generally accomplished by using an electrocautery device or an 18-gauge needle |
In a hospital or medical setting, trephining is generally accomplished by using an [[electrocautery]] device or an 18-gauge needle. The hole is covered with sterile dressing and must be kept dry afterwards.<ref name=statpearls /> |
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Removal of the nail is typically done when the nail itself is disrupted, a large laceration requiring [[surgical suture|suturing]] is suspected, or a [[Fracture (bone)|fracture]] of the tip of the finger occurs. Although general [[anesthesia]] is generally not required, a [[digital nerve block]] is recommended if the nail is to be removed.{{citation needed|date=January 2020}} For trephination, the block is often more painful than the procedure.<ref name=statpearls/> |
Removal of the nail is typically done when the nail itself is disrupted, a large laceration requiring [[surgical suture|suturing]] is suspected, or a [[Fracture (bone)|fracture]] of the tip of the finger occurs. Although general [[anesthesia]] is generally not required, a [[digital nerve block]] is recommended if the nail is to be removed.{{citation needed|date=January 2020}} For trephination, the block is often more painful than the procedure.<ref name=statpearls/> |
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| ⚫ | |||
Hématome sous ungéal 01.jpg|alt=Discoloured thumbnail, grey at the roots, blueish in the center, normal-looking towards the outside edge|Thumb before drainage. |
Hématome sous ungéal 01.jpg|alt=Discoloured thumbnail, grey at the roots, blueish in the center, normal-looking towards the outside edge|Thumb before drainage. |
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| ⚫ | |||
PaperclipRedHotSmall.jpg|alt=Paper clip turned red as a result of the flam|Red hot paper clip. |
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| ⚫ | |||
Percage-ongle-par-trombone.jpg|Holes in nail. |
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</gallery> |
</gallery> |
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| ⚫ | |||
== See also == |
== See also == |
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Latest revision as of 23:44, 30 August 2024
| Subungual hematoma | |
|---|---|
| Other names | Runner's toe, tennis toe, skier's toe |
 | |
| Subungal haematoma of the fourth finger | |
| Specialty | Internal medicine, Podiatry |
| Symptoms | Discoloration of nail, pain |
| Risk factors | Poorly fitting foot wear, overtraining particularly hiking and running |
| Treatment | Usually unmerited, blood drainage or nail removal in serious cases |
| Prognosis | Usually self-resolving as nail grows out |
A subungual hematoma is a collection of blood (hematoma) underneath a toenail or fingernail. It can be extremely painful for an injury of its size, although otherwise it is not a serious medical condition.
Nature
[edit]A laceration of the nail bed causes bleeding into the constricted area underneath the hard nail plate.[1] The blood pools under the nail, giving a reddish, brownish, blueish, or grey/blackish discoloration. The blood puts pressure to the nailbed causing pain which can be throbbing in quality and disappears when the pressure on the nail bed is relieved.[2]
Subungual hematomas typically heal without incident, though infection may occur. The pressure of the blood blister may cause separation of nail plate from the nail bed (onycholysis), but the nail should not be pulled off, as this can cause scarring of the nailbed and deformed nails.[3] Nail discolouration may last some months.[4]
The nail plate may also become thicker and more brittle as a result of the injury (onychochauxis). The deformed nail plate will gradually grow out and be replaced by a new, normal-appearing one in several months' time. Infrequently, the nail may become painful and require surgical drainage.[5]
Causes
[edit]
The condition is caused by a traumatic injury, such as slamming a finger in a door,[6] or from sports activities, especially those involving sudden accelerations, such as soccer, basketball, and tennis, or going downhill, such as running or hiking rugged terrain, and ill-fitting footwear.[4][3][7]: 52, 135
Repeatedly thrusting the toes against a shoe's toe box can cause a subungual hematoma called jogger's toe,[8] runner's toe, or black toenail. In a marathon, several percent of runners may be affected.[4] Wearing footwear which fits helps prevent runner's toe.[4]
If the shoe is too loose on the midfoot, the foot can slide forwards in the shoe, especially when going downhill. This may jam the toes into the end of the toebox.[4] If the foot is sliding forwards because the shoe is too loose around the midfoot, it may be restrained by lacing the shoe carefully, or placing bulky padding between the tongue and the lacing, or by wrapping a strap in a figure-eight around the foot and ankle (image).[7]: 86–87, 128, 142 Excessively tight or uneven fit around the midfoot may, however, cause tendon problems.[7]: 125 [better source needed]
Separately, if there is not enough space around the toes, the toes will also hit the toebox repeatedly.[4] Feet become longer and wider when weight is put on them, because the arches flatten, and the toes also splay and bend.[7]: p15, 18, 72–73 At the end of a long journey on foot, the arches flatten, the metatarsals spread, and the foot swells more than after a short one.[7]: 52 The toes also need vertical space; a toe cap which is low enough to press on the top of the toe may also cause bruising under the nail, especially if the toe cap is stiff. If the toebox is pointed, the toes may be wedged forwards into the area with inadequate height.[7]: 52–53, 135
Toenails which protrude unevenly may concentrate force on the toenail; properly-cut nails are therefore also important.[4]
Some susceptible runners may also have Morton's toe. In this variant of human foot anatomy, the second toe extends further out than the great toe. This can make it harder to find shoes with adequate space around the toes.[citation needed]
Treatment
[edit]Subungual hematomas can resolve on their own, without treatment being necessary.[4] If they are acutely painful,[9] they may be drained.[5]
Subungual hematomas are treated by either making a hole through the nail into the hematoma (trephining) within 48 hours of injury, draining the blood and releasing the pressure,[5] or, less conservatively, by removing the entire nail.[10]
In a hospital or medical setting, trephining is generally accomplished by using an electrocautery device or an 18-gauge needle. The hole is covered with sterile dressing and must be kept dry afterwards.[5]
Removal of the nail is typically done when the nail itself is disrupted, a large laceration requiring suturing is suspected, or a fracture of the tip of the finger occurs. Although general anesthesia is generally not required, a digital nerve block is recommended if the nail is to be removed.[citation needed] For trephination, the block is often more painful than the procedure.[5]
Complication rates from both forms of treatment are low, and the nail generally recovers to a normal appearance.[9]
-
Thumb before drainage. -
After drainage; note drainage hole.
.png){kind=link}
See also
[edit]
Wikimedia Commons has media related to Subungual hematoma of finger.
References
[edit]- ^ Selbst SM, Attia M (2006). "Lacerations". Textbook Of Pediatric Emergency Medicine. Hagerstown, MD: Lippincott Williams & Wilkins. p. 1571. ISBN 978-0-7817-5074-5.
- ^ Pingel, C.; McDowell, C. (2022). "Subungual Hematoma Drainage". Subungual Hematoma Drainage - StatPearls - NCBI Bookshelf. StatPearls. PMID 29494114.
- ^ a b "3 Tips to Protect Your Toenails If You're a Hard-Core Runner". Health Essentials from Cleveland Clinic. 3 December 2015.
- ^ a b c d e f g h Mailler, EA; Adams, BB (August 2004). "The wear and tear of 26.2: dermatological injuries reported on marathon day". British Journal of Sports Medicine. 38 (4): 498–501. doi:10.1136/bjsm.2004.011874. PMC 1724877. PMID 15273194.
- ^ a b c d e Pingel, C; McDowell, C (January 2019). "Subungual Hematoma Drainage". StatPearls [Internet]. PMID 29494114.
- ^ "Subungual Hematoma: Care Instructions". myhealth.alberta.ca.
- ^ a b c d e f Munson, Edward Lyman (1912). The soldier's foot and the military shoe; a handbook for officers and noncommissioned officers of the line. Menasha, Wis.: Press of the George Banta publishing company. (this is the publication of a four-year review into the footwear of the US military by the Army Shoe Board, of which the author, a physician and senior officer of the United States Army Medical Corps, is president.
- ^ Mailler, E A; Adams, BB (2004). "The wear and tear of 26.2: dermatological injuries reported on marathon day". British Journal of Sports Medicine. 38 (4): 498–501. doi:10.1136/bjsm.2004.011874. PMC 1724877. PMID 15273194.
- ^ a b Dean, B; Becker, G; Little, C (2012). "The management of the acute traumatic subungual haematoma: a systematic review". Hand Surgery. 17 (1): 151–4. doi:10.1142/S021881041230001X. PMID 22351556.
- ^ "Primary Care Procedures: Trephination of Subungual Hematoma". consultantlive. UBM Medica, LLC. Archived from the original on 21 August 2016. Retrieved 30 July 2016.