Rotasjonsproblematikk

Sist oppdatert: 20.10.2021
Utgiver: Vestre Viken HF
Versjon: 0.6
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Beskrivelse 

  • Mange barn har inntåing med/uten innkneing uten at de har plager av dette.
  • Vanligvis normaliseres rotasjonsforholdene i underekstremitetene i løpet av vekst og alder.
  • Hos voksne er gjennomsnittlig femuranteversjon 15° og extern tibiatorsjon 10°.
  • På hvilket nivå befinner rotasjonsavviket seg?

Klinikk 

Barn med inn-rotasjonsdeformitet vil gjerne klage over

  • snubletendens
  • knærne går i hverandre ("knock knees")
  • vansker med løing, beina går som "hjulvisper" under løp
  • vansker med å sparke fotball med innsiden av skoen
  • vansker med å gå på ski (gå fiskebein)
  • vansker med å gå på skøyter
  • andre funksjonelle vansker

 

Små barn med økt femuranteversjon har lett for å sitte i W-stilling på gulvet. Dette er ikke skadelig (slik enkelte mener), men er et uttrykk for den økte innrotasjonen i hoftene.

Diagnostikk 

Hvilket nivå befinner rotasjonsavviket seg?

 

Klinisk undersøkelse:

  • Femur (forøket femuranterversjon) med stor asymmetri i rotasjonsutslag, ROM utrotasjon < 20 gr
  • Tibia (økt intern tibiatorsjon) med rettstilte knær og redusert bimalleolær vinkel ROM < 20 gr
  • Foten (vanligvis pes adduktus)

 

Sjekk også for andre akseavvik i UX, for eksempel varus/valgus og anisomeli og hoftedysplasi.

 

Fra Lynn Staheli's bok om barneortopedi: Fundamentals of Pediatric Orthopedics, Seattle 2008.

 

Det vil vanligvis ikke være indikasjon for deroterende osteotomi dersom femuranteversjonen målt på CT er under 40 grader.

 

Utregning av rotasjonsforholdene på CT mål kan gjøres ved hjelp av denne kalkulatoren: http://uwmsk.org/legrotation.html

 

Femuranteversjonen endres i løpet av vekst og alder, se kurve under. Det er derfor fornuftig å avvente operasjon til pasienten nærmer seg utvokst, for eksempel i 12-13 års alder.

 

 

Sjekk også for andre akseavvik i UX, for eksempel varus/valgus og anisomeli og hoftedysplasi.

 

Alle barn som vurderes for operasjon skal ha tatt rtg bekken front og CT rotasjonsmål av UX.

 

Normalgrense for femuranteversjon er < 40°, for tibia >15° utrotasjon.

 

Barn med inntåing kan vurderes for operasjon (deroterende femurosteotomi) dersom de;

  • er over 10 år (helst 11-12 år)
  • har funksjonelle plager eller smerter assosiert med inntåingen
  • Utrotasjon i hoften er < 20 grader

 

Barn med inntåing kan vurderes for operasjon (deroterende distal tibiaosteotomi) dersom de;

  • Bimalleolærvinkel er < 20 grader

 

Dersom rotasjonsdeformiteten sitter på

  • femur-nivå gjøres proksimal deroterende femurosteotomi ca 30 grader.
  • legg-nivå gjøres distal deroterende tibiaosteotomi ca 15-30 grader. Ved behov gjøres skråosteotomi av fibula midt på leggen.
  • Fot-nivå gjøres korrigerende fotkirurgi, eksempelvis dobbeltosteotomi i forfoten.

Behandling 

Barn med inntåing kan som regel vurderes for operasjon (deroterende osteotomi) dersom de;

  • er over 10 år (helst 11-12 år)
  • har redusert funksjon eller smerter assosiert med inntåingen
  • Utrotasjon i hoften er < 20 grader eller
  • Bimalleolærvinkel er < 20 grader

 

Dersom rotasjonsdeformiteten sitter på

  • femur-nivå: proksimal deroterende femurosteotomi 30-40 grader, alternativt distal detorerende femurosteotomi eller midt-diafysært.
  • legg-nivå: distal deroterende tibiaosteotomi 20-30 grader. Ved behov, vanligvis ved derotasjon over 20 grader, gjøres skråosteotomi av fibula midt på leggen.
  • fot-nivå: korrigerende fotkirurgi, eksempelvis dobbeltosteotomi i forfoten.

 

Ved midt-diafysær eller subtrokantær rotasjonsosteotomi benyttes IM trokantær nagle. Fordelen med denne metoden er at den er perkutan og at pasienten som regel kan mobiliseres og belaste inntil smertegrensen umiddelbart etter operasjonen. Ved mer proksimal osteotomi, hvor det for eksempel skal gjøres mer kombinerte korreksjoner (varus/ekstenderende, osv) er det rimelig å benytte låseplate/hofteplate.

 

Dersom det samtidig er indikasjon for varisering i hoften kan man vurdere å benytte en rett IM nagle, for eksempel en humerus-nagle. Vi har så langt gode erfaringer med en slik rett nagle. Metoden har mange av de samme fordelene som ved lang IM nagle og proksimal/midt-diafysær osteotomi, men mobiliseringen og belastningen kan da bli mer begrenset og må vurderes individuelt.

 

I proksimale femur bruker vi primært en IM nagle, evenutelt en Pediatric Hip Plate 120-130 grader (flere tilgjengelige leverandører).

I distale femur benyttes femurkondylplate (flere leverandører).


Implantantene skal matche pasientens vekt, det vil vanligvis bety 3.5 mm plate ved vekt < 35 kg og 5.0 mm plate ved vekt > 35 kg.

Etterbehandling 

Grad av belastning er avhengig av valg av operasjonsmetode.

  • Ved osteotomi med IM nagle kan pasienten fullbelaste inntil smertegrensen umiddelbart etter operasjonen.
  • Ved proksimal eller distal osteotomi med platefiksasjon kan pasienten avlaste benet med krykker under tilhelingen. Det kan tillates touch-belastning, max 5-10 kg.

 

Eventuell oppfølging av lokal fysioterapeut. Rekvisisjon er ikke nødvendig.

Kontroll 

  • Kontroll tilheling 6 uker postoperativt.
  • Klinisk og radiologisk kontroll.
  • Etter tilheling kan pasienten tillates full belastning, men anbefaler gradvis opptrening.
  • Pasienten kan ved behov kontakte lokal fysioterapeut for hjelp med opptreningen med vekt på styrke, stabilitet, balanse.
  • Ved ukomplisert tilheling etter 6 uker er det ikke påkrevet med videre kontroller.

Prognose  

  • God prognose. Ved korrekt utført derotasjonsosteotomi oppnår man endring tilsvarende utført derotasjon. Pasienten blir som regel mindre slitne av aktivitet fordi de nå ikke trenger å bruke aksessorisk muskulatur for å opprettholde kliniske akser under aktiviteten.
  • Pasienten gjøres oppmerksom på å tape (Norgesplaster) såret det første postoperative året for å unngå uheldig/overdreven arrdannelse.
  • Dersom derotasjonen utføres i tidlig barnealder - for eksempel i 6-7 års alderen - er det en risiko for tilbakefall av femuranteversjonen.
  • Det er ikke kjent at man kan ha tilsvarende tilbakefall etter en deroterende distal tibiaosteotomi, muligens på grunn av lavere vekst i distale tibia.
  • Ved fotkorreksjoner vil det være avgjørende å velge riktig operasjon. Det vil vanligvis være tilstrekkelig med korrigerende dobbeltosteotomi gjennom midtfoten ved pes adduktus-deformitet, men som alltid må man også se på foten som helhet på leting etter andre eventuell tilhørende deformiteter, for eksempel cavovarus.

Komplikasjoner 

  • Største risiko ved korreksjon av rotasjonsdeformitet er feil valg av prosedyre.
  • Man ser svært sjelden osteosyntesesvikt, infeksjoner, blødniner eller sårproblemer ved korrekt utført kirurgi.

Litteratur 

Oversikt

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  2. Staheli LT, Corbett M, Wyss C, et al. Lower-extremity rotational problems in children: normal values to guide management. J Bone Joint Surg Am. 1985 Jan;67(1):39-47.Abstract external link opens in a new window

 

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