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Transient synovitis

transient synovitis, transient synovitis pain in children
Transient synovitis of the hip also called toxic synovitis; see below for more synonyms is a self-limiting condition in which there is an inflammation of the inner lining the synovium of the capsule of the hip joint The term irritable hip refers to the syndrome of acute hip pain, joint stiffness, limp or non-weightbearing, indicative of an underlying condition such as transient synovitis or orthopedic infections like septic arthritis or osteomyelitis1 In everyday clinical practice however, irritable hip is commonly used as a synonym for transient synovitis It should not be confused with sciatica, a condition describing hip and lower back pain much more common to adults than transient synovitis but with similar signs and symptoms

Transient synovitis usually affects children between three and ten years old but it has been reported in a 3-month-old infant and in some adults2 It is the most common cause of sudden hip pain and limp in young children34 Boys are affected two to four times as often as girls456 The exact cause is unknown A recent viral infection most commonly an upper respiratory tract infection or a trauma have been postulated as precipitating events, although these are reported only in 30% and 5% of cases, respectively6

Transient synovitis is a diagnosis of exclusion3 The diagnosis can be made in the typical setting of pain or limp in a young child who is not generally unwell and has no recent trauma There is a limited range of motion of the hip joint Blood tests may show mild inflammation An ultrasound scan of the hip joint can show a fluid collection effusion Treatment is with non-steroidal anti-inflammatory drugs and limited weight-bearing The condition usually clears by itself within seven to ten days,4 but a small group of patients will continue to have symptoms for several weeks The recurrence rate is 4–17%, most of which is in the first six months7

Contents

  • 1 Synonyms
  • 2 Symptoms and signs
  • 3 Differential diagnosis
  • 4 Diagnosis
  • 5 Treatment
  • 6 Complications
  • 7 References
  • 8 External links

Synonymsedit

In addition to the terms mentioned above, irritable hip has historically been termed transitory coxitis, coxitis fugax, acute transient epiphysitis, coxitis serosa seu simplex, phantom hip disease and observation hip8

Symptoms and signsedit

Transient synovitis causes pain in the hip, thigh, groin or knee on the affected side4 There may be a limp or abnormal crawling in infants with or without pain In small infants, the presenting complaint can be unexplained crying for example, when changing a diaper The condition is nearly always limited to one side4 The pain and limp can range from mild to severe

Some children may have a slightly raised temperature; high fever and general malaise point to other, more serious conditions On clinical examination, the child typically holds the hip slightly bent, turned outwards and away from the middle line flexion, external rotation and abduction6 Active and passive movements may be limited because of pain, especially abduction and internal rotation The hip can be tender to palpation The log roll test involves gently rotating the entire lower limb inwards and outwards with the patient on his back, to check when muscle guarding occurs The unaffected hip and the knees, ankles, feet and spine are found to be normal7

Differential diagnosisedit

Pain in or around the hip and/or limp in children can be due to a large number of conditions Septic arthritis a bacterial infection of the joint is the most important differential diagnosis, because it can quickly cause irreversible damage to the hip joint3 Fever, raised inflammatory markers on blood tests and severe symptoms inability to bear weight, pronounced muscle guarding all point to septic arthritis,910 but a high index of suspicion remains necessary even if these are not present4 Osteomyelitis infection of the bone tissue can also cause pain and limp

Bone fractures, such as a toddler's fracture spiral fracture of the shin bone, can also cause pain and limp, but are uncommon around the hip joint Soft tissue injuries can be evident when bruises are present Muscle or ligament injuries can be contracted during heavy physical activity —however, it is important not to miss a slipped upper femoral epiphysis Avascular necrosis of the femoral head Legg-Calvé-Perthes disease typically occurs in children aged 4–8, and is also more common in boys There may be an effusion on ultrasound, similar to transient synovitis11

Neurological conditions can also present with a limp If developmental dysplasia of the hip is missed early in life, it can come to attention later in this way Pain in the groin can also be caused by diseases of the organs in the abdomen such as a psoas abscess or by testicular disease Rarely, there is an underlying rheumatic condition juvenile idiopathic arthritis, Lyme arthritis, gonococcal arthritis, or bone tumour

Diagnosisedit

There are no set standards for the diagnosis of suspected transient synovitis, so the amount of investigations will depend on the need to exclude other, more serious diseases

Inflammatory parameters in the blood may be slightly raised these include erythrocyte sedimentation rate, C-reactive protein and white blood cell count, but raised inflammatory markers are strong predictors of other more serious conditions such as septic arthritis910

X-ray imaging of the hip is most often unremarkable Subtle radiographic signs include an accentuated pericapsular shadow, widening of the medial joint space, lateral displacement of the femoral epiphyses with surface flattening Waldenström sign, prominent obturatordisambiguation needed shadow, diminution of soft tissue planes around the hip joint or slight demineralisation of the proximal femur The main reason for radiographic examination is to exclude bony lesions such as occult fractures, slipped upper femoral epiphysis or bone tumours such as osteoid osteoma An anteroposterior and frog lateral Lauenstein view of the pelvis and both hips is advisable12

An ultrasound scan of the hip can easily demonstrate fluid inside the joint capsule Fabella sign, although this is not always present in transient synovitis613 However, it cannot reliably distinguish between septic arthritis and transient synovitis1415 If septic arthritis needs to be ruled out, needle aspiration of the fluid can be performed under ultrasound guidance16 In transient synovitis, the joint fluid will be clear4 In septic arthritis, there will be pus in the joint, which can be sent for bacterial culture and antibiotic sensitivity testing

More advanced imaging techniques can be used if the clinical picture is unclear; the exact role of different imaging modalities remains uncertain Some studies have demonstrated findings on magnetic resonance imaging MRI scan that can differentiate between septic arthritis and transient synovitis for example, signal intensity of adjacent bone marrow171819 Skeletal scintigraphy can be entirely normal in transient synovitis, and scintigraphic findings do not distinguish transient synovitis from other joint conditions in children20 CT scanning does not appear helpful

Treatmentedit

Treatment consists of rest, non-weightbearing and painkillers when needed A small study showed that the non-steroidal anti-inflammatory drug ibuprofen could shorten the disease course from 45 to 2 days and provide pain control with minimal side effects mainly gastrointestinal disturbances21 If fever occurs or the symptoms persist, other diagnoses need to be considered7

Complicationsedit

In the past, there have been speculations about possible complications after transient synovitis The current consensus however is that there is no proof of an increased risk of complications after transient synovitis22

One such previously suspected complication was coxa magna, which is an overgrowth of the femoral head and broadening of the femoral neck, accompanied by changes in the acetabulum, which may lead to subluxation of the femur723 There was also some controversy about whether continuous high intra-articular pressure in transient synovitis could cause avascular necrosis of the femoral head Legg-Calvé-Perthes disease, but further studies did not confirm any link between the two conditions24

Referencesedit

  1. ^ Fischer SU, Beattie TF Nov 1999 "The limping child: epidemiology, assessment and outcome" J Bone Joint Surg Br 81 6: 1029–34 PMID 10615981 doi:101302/0301-620X81B69607 
  2. ^ Quintos-Macasa AM, Serebro L, Menon Y Feb 2006 "Transient synovitis of the hip in an adult" South Med J 99 2: 184–5 PMID 16509560 doi:101097/01smj0000199746290094c 
  3. ^ a b c Hart JJ Oct 1996 "Transient synovitis of the hip in children" Am Fam Physician 54 5: 1587–91, 1595–6 PMID 8857781 
  4. ^ a b c d e f g Scott Moses, MD "Transient hip tenosynovitis" Family practice notebook Revision of August 9, 2007 Retrieved December 22, 2007
  5. ^ Vijlbrief AS, Bruijnzeels MA, van der Wouden JC, van Suijlekom-Smit LW Oct 1992 "Incidence and management of transient synovitis of the hip: a study in Dutch general practice" The British journal of general practice : the journal of the Royal College of General Practitioners 42 363: 426–8 PMC 1372234  PMID 1466922 
  6. ^ a b c d Irritable hip General Practice Notebook Retrieved December 22, 2007
  7. ^ a b c d ped/1676 at eMedicine
  8. ^ Do TT Feb 2000 "Transient synovitis as a cause of painful limps in children" Current Opinion in Pediatrics 12 1: 48–51 PMID 10676774 doi:101097/00008480-200002000-00010 
  9. ^ a b Caird MS, Flynn JM, Leung YL, Millman JE, D'Italia JG, Dormans JP Jun 2006 "Factors distinguishing septic arthritis from transient synovitis of the hip in children A prospective study" J Bone Joint Surg Am 88 6: 1251–7 PMID 16757758 doi:102106/JBJSE00216 
  10. ^ a b Kocher MS, Mandiga R, Zurakowski D, Barnewolt C, Kasser JR Aug 2004 "Validation of a clinical prediction rule for the differentiation between septic arthritis and transient synovitis of the hip in children" J Bone Joint Surg Am 86–A 8: 1629–35 PMID 15292409 
  11. ^ Legg-Calve-Perthes Disease at eMedicine
  12. ^ Gough-Palmer A, McHugh K Jun 2007 "Investigating hip pain in a well child" BMJ 334 7605: 1216–7 PMC 1892599  PMID 17556478 doi:101136/bmj3918851574147 
  13. ^ Nicola Wright, Vince Choudhery Ultrasound is better than x-ray at detecting hip effusions in the limping child BestBETsorg Retrieved December 22, 2007
  14. ^ Zamzam MM Nov 2006 "The role of ultrasound in differentiating septic arthritis from transient synovitis of the hip in children" J Pediatr Orthop B 15 6: 418–22 PMID 17001248 doi:101097/01bpb0000228388321847f 
  15. ^ Bienvenu-Perrard M, de Suremain N, Wicart P, et al Mar 2007 "Benefit of hip ultrasound in management of the limping child" Benefit of hip ultrasound in management of the limping child J Radiol in French 88 3 Pt 1: 377–83 PMID 17457269 doi:101016/S0221-03630789834-9 
  16. ^ Skinner J, Glancy S, Beattie TF, Hendry GM Mar 2002 "Transient synovitis: is there a need to aspirate hip joint effusions" Eur J Emerg Med 9 1: 15–8 PMID 11989490 doi:101097/00063110-200203000-00005 
  17. ^ Kwack KS, Cho JH, Lee JH, Cho JH, Oh KK, Kim SY Aug 2007 "Septic arthritis versus transient synovitis of the hip: gadolinium-enhanced MRI finding of decreased perfusion at the femoral epiphysis" AJR Am J Roentgenol 189 2: 437–45 PMID 17646472 doi:102214/AJR072080 
  18. ^ Yang WJ, Im SA, Lim GY, et al Nov 2006 "MR imaging of transient synovitis: differentiation from septic arthritis" Pediatr Radiol 36 11: 1154–8 PMID 17019590 doi:101007/s00247-006-0289-9 
  19. ^ Lee SK, Suh KJ, Kim YW, et al May 1999 "Septic arthritis versus transient synovitis at MR imaging: preliminary assessment with signal intensity alterations in bone marrow" Radiology 211 2: 459–65 PMID 10228529 doi:101148/radiology2112r99ma47459 
  20. ^ Connolly LP, Treves ST Jun 1998 "Assessing the limping child with skeletal scintigraphy" J Nucl Med 39 6: 1056–61 PMID 9627343 
  21. ^ Kermond S, Fink M, Graham K, Carlin JB, Barnett P Sep 2002 "A randomized clinical trial: should the child with transient synovitis of the hip be treated with nonsteroidal anti-inflammatory drugs" Annals of Emergency Medicine 40 3: 294–9 PMID 12192353 doi:101067/mem2002126171 
  22. ^ Mattick A, Turner A, Ferguson J, Beattie T, Sharp J Sep 1999 "Seven year follow up of children presenting to the accident and emergency department with irritable hip" J Accid Emerg Med 16 5: 345–7 PMC 1347055  PMID 10505915 doi:101136/emj165345 
  23. ^ Sharwood PF Dec 1981 "The irritable hip syndrome in children A long-term follow-up" Acta Orthop Scand 52 6: 633–8 PMID 7331801 doi:103109/17453678108992159 
  24. ^ Kallio P, Ryöppy S, Kunnamo I Nov 1986 "Transient synovitis and Perthes' disease Is there an aetiological connection" J Bone Joint Surg Br 68 5: 808–11 PMID 3782251 

External linksedit

  • Leet AI, Skaggs DL Feb 2000 "Evaluation of the acutely limping child" Am Fam Physician 61 4: 1011–8 PMID 10706154 : An illustrated, free full-text review with emphasis on clinical examination of the acutely limping child
  • Irritable hip - NHS Direct - Health encyclopaedia
  • Transient Synovitis of the Hip: A Cause of Hip Pain in Children - by Familydoctororg, a web site operated by the American Academy of Family Physicians

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