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Hip symptoms are a common source of secondary care referrals from primary care. Common presenting complaints include pain in the hip or a limping child.1 However, some children may have difficulty localising the pain and thus complain of pain in their groin, knee or leg.1 In all patients, a thorough history and examination of the hip should be undertaken. Here, we have compiled a list of the most common paediatric hip disorders you are likely to see or discuss on your orthopaedic surgery rotation.
Anatomy of the Hip
The hip is a ball-in-socket joint that provides the movements of flexion, extension, abduction, adduction, internal and external rotation and circumduction. The head of the femur sits in the acetabulum, joined centrally by the ligamentum teres (ligament of the head of the femur), carrying the acetabular branch of the obturator artery. The acetabular fossa is lined by the acetabular labrum, joined inferiorly by the transverse acetabular ligament. Surrounding these structures is the synovial joint capsule (Figure 1). Three external ligaments support the hip – iliofemoral, ischiofemoral, pubofemoral- named respectively for the part of the hip bone from which they originate, and their insertion into the femur. An x-ray will usually be sought for a child presenting with a hip problem, therefore it is important to also have a basic understanding of radiographic anatomy (Figure 2).
Developmental Dysplasia of the Hip (DDH) 4
What is it?
A disorder of abnormal development resulting in dysplasia and possible subluxation or dislocation of the hip secondary to capsular laxity and mechanical factors.5
DDH is the most common abnormality in newborn infants. Due to the nature of how the baby sits in the womb, the left hip is more commonly affected.4 DDH is more commonly seen in Native Americans and Laplanders.
The exact cause of DDH is unknown but there are many risk factors associated with it, including:
Family history of DDH
Female baby- more sensitive to mother’s hormones that make ligaments lax
Fixed foot deformity- less space in the womb
Torticollis- less space in the womb
There is no singular way to prevent DDH. Interestingly though, in some cultures, the incidence of DDH may be influenced by local child-rearing practices, as certain swaddling and baby-carrying techniques have been shown to correlate with a decline in this disorder.6
If DDH is suspected, an examination of the hip should be undertaken. Findings in 3-6-month-olds include: leg length discrepancy and limitations in hip abduction due to contractures. In older children (>1year), a Trendelenburg gait and toe walking may also be seen. Further findings at any age include:
Asymmetrical buttock creases
The Ortolani and Barlow tests are used to screen babies for hip dysplasia at 3-6 months old (Figure 3).
An ultrasound can be performed in infants less than 4-6months old, while an antero-posterior (AP) pelvic radiograph should be performed in children greater than 4-6months old, when the femoral head ossification centre is visible (Figure 4).
Less than 6 months old
6-18months old or failure of Pavlik Harness
Closed Reduction and Spica Casting
Greater than 18 months old or failure of closed reduction
Operative management (open reduction + hip reconstruction)
Transient femoral nerve palsy with excessive flexion during Pavlik bracing
Avascular necrosis. Why? Because of retrograde femoral head blood flow. Most commonly affects the median circumflex femoral artery.
Figure 3. DDH Screening tests. The Ortolani and Barlow screening tests for DDH are performed at the 3-6month infant check-up.
Legg-Calve-Perthes (Perthes) Disease 9
What is it?
Idiopathic avascular necrosis of proximal femoral epiphysis in children.
In the UK, the incidence of Legg-Calve-Perthes disease is 7.8 per 100,000 children aged 0-14. 10
The exact cause of Perthes disease is unknown but there are some risk factors associated with it, including:
Limp (can be painless)
Hip stiffness- loss of internal rotation and abduction
Leg length discrepancy (late finding)
A bilateral AP pelvic x-ray and frog-leg lateral x-ray are used to diagnose Perthes disease (Figure 5). A bone scan or MRI can sometimes also be used if the diagnosis is unclear. This can also provide information on the extent of femoral head involvement. Key radiographic signs of Perthes disease include:11
Asymmetrical femoral epiphyseal size
Increased density of femoral head epiphysis
Coxa Plana- femoral head widening and flatting (shown clearly in Figure 5)
Coxa Magna- proximal femoral neck deformity
“Sagging Rope Sign”- thin sclerotic line running across the femoral neck
*Crescent’s Sign is a specific finding on radiograph in late stages of the disease and represents a subchondral fracture.
Casting and bracing
Surgery (osteotomy) is considered by the orthopaedic surgeon, based upon the patient’s age, radiographic findings and clinical features. The following would increase the likelihood of the need for surgical intervention:9
>50% femoral head damaged
Nonsurgical management has been unsuccessful
General joint stiffness and immobility
Premature physeal arrest, degenerative arthritis
Unequal, shortened limb length
Slipped Capital Femoral Epiphysis (SCFE) 13
What is it?
SCFE is when the metaphysis of the femur displaces anteriorly and superiorly, leading to the displacement of the capital femoral epiphysis.
SCFE is the most common hip disorder in adolescents. 14
The exact cause of SCFE is unknown but there are some risk factors associated with it, including:
Obesity- increases stress on physis
Puberty/Endocrine disorders- hormones weaken physis, making it more prone to displacement
Abnormal leg alignment- external rotation
Abnormal gait/limp- may have Trendelenburg gait
Decreased range of movement
Weakness and muscle atrophy
SCFE is diagnosed by obtaining bilateral AP pelvic x-rays, along with a frog-leg lateral x-ray (Figure 6). You may wish to consider ordering hormone blood tests like TFTs or GH in the presence of a conjunctive endocrine disorder.
In situ fixation of epiphysis with screw
Bone graft epiphysiodesis
In situ fixation with multiple pins
SCFE in the contralateral hip
Pin associated fracture
Transient Synovitis 18
What is it?
An intermittent inflammatory disorder of the synovium of the hip, common in paediatric populations.
Up to 3% of children have an episode of transient synovitis at some point during their life.18
The exact cause of transient synovitis is unknown; however many children develop the disease secondary to a viral upper respiratory infection.
Hip presents in flexion, abduction and external rotation
Limited range of motion- most commonly, hip abduction
FBC- ↑WCC (>12,000cells/mm3)
↑ ESR, CRP for inflammation
AP, lateral or frog-leg X-ray to rule out other paediatric hip disorders
Ultrasound can be performed if there is suspicion of septic arthritis
*Note- The most important differential diagnosis to rule out is septic arthritis. Therefore, always review Kocher’s criteria and perform an ultrasound if there is clinical suspicion of this severe pathological process.19
Transient synovitis is a self-limiting disorder that typically lasts 7-10 days, therefore management is focused on relieving the patient’s symptoms:
Bed rest (short time)
*Avoid aspirin in children due to the risk of Reye’s syndrome
There are rarely any complications of transient synovitis.
The signs and symptoms of the various paediatric hip disorders often overlap. In order to help distinguish between pathologies during exams and OSCEs, it is beneficial to think about each condition in the context of the age range most commonly affected (Table 1).
Table 1. Breakdown of Common Paediatric Hip Disorders by Age Range 20
Age range (years)
Perthes Transient Synovitis
Below find a brief summary table of the common paediatric hip disorders we have discussed (Table 2). Use this summary table as a non-exclusive, quick review for revision purposes. Common symptoms experienced across all conditions are pain and/or limping.
Table 2. Summary of Common Paediatric Hip Disorders
Female, breech delivery, family hx
<4-6 months = U/S
4-6 months = X-Ray
<6 months + reducible hip = Pavlik harness
AP Pelvic X-Ray Frog-Leg Lateral X-Ray
May be non-surgical or surgical depending on patient factors
Male, obese, endocrine disorder
AP Pelvic X-Ray Frog Leg X-Ray
FBC, ESR, CRP US if suspicion of septic arthritis
Miss Kirsty MacLeod
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