Peds Flashcards
Treatment for teenage patient w/ hx of perthes? Deformity has healed and hip can no longer be contained
Chiari and/or shelf pelvic osteotomies for hips that can no longer be contained.
Containment strategies: proximal femoral varus and Salter innominate osteotomies aimed at improving containment are not indicated.
Proximal femoral valgus osteotomy unlikely if head is severe deformed
The clinical factors shown to most significantly predict the long-term outcome of Perthes disease of the hip include which of the following?
Age at presentation, range of motion of the hip
Younger patients and patients who maintain range of motion of the hip are more likely to have a good outcome. In Herring’s study, children with a chronologic age of younger than 8 years or a bone age of less than 6 years had significantly more favorable outcomes compared with older children. Limited hip range of motion may be due to muscle spasm early on, or synovitis; but in late disease, it may reflect incongruity of the joint. Classifications based on femoral head shape have also been correlated to prognosis. Significant shortening of the affected hip is not common.
5 y/o with bilateral symmetric femoral head epiphyseal changes warrants what additional work up?
Skeletal Survey: radiographs of knees and spine
Bilateral flattening of the femoral heads suggests multiple epiphyseal dysplasia; therefore, a skeletal survey is indicated to look for involvement of other epiphyses. Unilateral flattening of the femoral head would suggest Legg-Perthes disease.
bilateral Perthes of the hips occurs in 11% of cases, in patients with symmetric changes/stages, other diagnoses must be considered such as Meyers dysplasia. Multiple epiphyseal dysplasia is most readily diagnosed by evaluation of other radiographs, in particular of the knee and, if confirmatory, of the spine to assess for spondyloepiphyseal dysplasia.
What is LCPD
Osteonecrosis of proximal femoral epiphysis
Summary: idiopathic AVN of proximal femoral epiphysis, Suspect w/ radiographs but MRI required for occult or early disease. Observe in children less than 8; femoral and or pelvis osteotomy in children greater than 8.
LCPD associated factors? If bilateral hip involvement seen what is the next step?
How does it present.
- Associated factors: FHx 1.6-20%, ADHD 33%, 89% are skeletally immature, 50-75% w/ coagulopathy
- present in 10% to 15% of patients. If both hips are in the same stage of disease, Xrays for skeletal dysplasia.
- ○ More common- Boys 4-8 (5:1 M:F)
○ Hip, groin, or thigh pain, knee pain, effusion (synovitis), limp
○ Exam: decrease hip abduction and IR,
§ trendelenburg gait (head collapse leads to decreased tension of abductors)
LCPD: Whats the most predictive best agreed upon radiographic finding?
Lateral Pillar of capital femoral epiphysis during fragmentation stage. 6 months after onset of symptoms, base on height of lateral pillar of capital femoral epiphysis on AP pelvis.
What is the lateral pillar classification of legg calve perthes?
- group A, normal height of lateral pillar is maintained. Good outcomes
- group B, more than 50% of height of lateral pillar is maintained. Good outcomes younger <6 y/o, poorer outcomes in older pop
- group B/C (borderline), lateral pillar is 50% or less in height, but (1) it is very narrow (2 to 3 mm wide), (2) it has very little ossification, or (3) it has depressions in comparison with the central pillar.
- group C, less than 50% of height of lateral pillar is maintained. Poor prognosis
The definition of normal pillars was derived by noting the lines of demarcation between the central sequestrum and the remainder of the epiphysis on the anteroposterior radiograph
LCPD Prognostic factors: what is essential in achieving a good result,
- Maintain sphericity of femoral head most important factor in achieving a good result.
- Early DJD w/ aspherical femoral head
- Poor prognosis: age >6, F, lateral column C, decreased abduction
Tx of LCPD:
* What are the goals of treatment?Who can be treated non surgically?
- Goals: symptom relief, restore ROM, contain hip
- Patients younger than 6 years without complete collapse of the lateral pillar generally can be treated nonsurgically. Most patients achieve Stulberg grade I or grade II hips at maturity, with 80% achieving a good outcome.
- Patients older than 8 years appear to benefit from surgically provided containment of the femoral head. This is particularly true lateral pillar group B and group B/C border hips.
LCPD: what is the significance of hinged abduction and how is it treated?
Hinged abduction, in which lateral extrusion of the femoral head results in it impinging on the edge of the acetabulum with abduction, may be present. Treatment option include the following:
A valgus-flexion proximal femur osteotomy to place the concentric portion in contact with the acetabular roof.
Pelvic osteotomy procedures, such as a Chiari osteotomy, shelf arthroplasty, and shelf acetabuloplasty (labral support procedure), also may be beneficial but have very limited indications
What is the goal of treatment in LCPD?
The goal of management is to achieve a spherical femoral head and a congruent joint to minimize the risk of osteoarthritis. Containment is most crucial during stages I and II, during which the head is most vulnerable to deformation. Hip pain stems from synovitis, which leads to motion restriction. This can be relieved by NSAIDs, protected–weight bearing, and activity modifications. If ROM can be maintained, continued observation may allow for successful shaping of the femoral head. Limited motion leads to restricted molding of the femoral head by the acetabulum, leading to deformation.
LCPD: Surgical management during fragmentation stages has been shown to result in the greatest efficacy. What is the surgical strategy
- Femoral-sided containment may be achieved via a proximal femur varus osteotomy.
- Acetabular-sided containment may be achieved via a redirectional osteotomy (Salter, triple innominate), acetabular augmentation procedure (shelf arthroplasty) or Chiari osteotomy.
Operative:
Children >8, lateral pillar B & B/C
large recent studies show improved outcomes with surgery for lateral pillar B and B/C in children > 8 years (bone age >6 years)
Proximal femoral varus osteotomy (containment); Pelvic Osteotomy (Salter or Triple)
LCPD Non Op
Non-op:
observation alone, activity restriction (non-weightbearing), and physical therapy (ROM exercises)
- children < 8 years of age (bone age <6 years); young patients typically do not benefit from surgery
- lateral pillar A involvement
- Bracing/casting for containment not beneficial in large studies
Non-op outcomes: Good outcomes correlate with spherical femoral head; 60% do not require operative intervention.
Long term outcomes for LCPD
Prognosis is related to patient age at disease onset and femoral head deformity at skeletal maturity. Patients younger than 6 years at disease onset typically have a good outcome
Many studies combine grades I and II into a single group and compare outcomes with those of combined groups III, IV, and V.
The risk of premature osteoarthritis of the hip is low (zero to 16%) if the femoral head is spherical (grades I and II).
The risk of premature osteoarthritis of the hip is high (58% to 78%) if the femoral head is nonspherical (grades III through V).
The Stulberg classification is the most widely used system for outcome measurements and correlates with degenerative changes at long-term follow-up. The classification system is based on femoral head sphericity and joint congruency at skeletal maturity.
Sprengels deformity:
- small, undescended scapula often associated with scapular winging and scapular hypoplasia
- omovertebral connection between superior medial angle of scapula and c spine (30-50%)
- 1/3 of klippel-feil have it
- Physical exam: high riding medially rotated scapula, shoulder abduction severely limited as well as forward flexion.
- surgery: best between 3-8: Woodward and green procedures can improve abduction by 40-50 degrees
SCFE: demographics, Risk factors
- Obese, Males, African Americans, during puberty/growth spurt 10-14ish range
- Bilateral 17-50% avg 25%
- # 1 risk factor: obesity > #2 acetabular retroversion/femoral anteverision> hx of radiation
- …Leptin levels 4.9x increase in odds
SCFE direction of slip and pathoanatomy
- Metaphysis translates anteriorly and externally rotates
- epiphysis in acetabulum lying posterior/infeor to metaphysis.
- Slippage through hypertrophic zone. Perichondral ring thins and weakens during adolescent. Physis is still vertically oriented.
SCFE associated conditions? What needs to be worked up?
- Endocrine work up necessary if child <10 y/o and weight <50%
- Endocrine disorders:
- hypothyroidism: elevated TSH
- renal osteodystrophy: elevated BUN Cr
- GH deficiency
- panhypopituitarism
- . Downs syndrome
SCFE presentation? Why knee pain? unstable vs stable
- pain in hip (52%), groin (14%) and thigh (35%)
- 15-50% knee pain, medial obturator nerve
- Abnormal gait/limp. externally rotated foot progression anlge.
- Exam: obligatory external rotation during passive flexion.
- Stable scfe: able to bear weight w/ or w/o crutches <10% risk of osteonecrosis
- unstable: unable to ambulate (high risk of osteonecrosis (24-47%)
If xray is negative in a SCFE, order?
Hx of scfe in L hip, incidence of subsequent scfe on contralateral hip
- MRI, may diagnose preslip condition. T1 decreased signal, increased signal on T2
- In one study, nearly 40% of patients with SCFE had bilateral involvement, and of that 40%, half presented initially with a unilateral SCFE but had a subsequent SCFE on the contralateral limb. Radiographs are normal, but the MRI scan shows increased signal about the proximal femoral physis.
SCFE perc screws
- 1 vs 2 screws controversal but 2 screws biomechanically better.
- 1 screw typically sufficient and decrease risk of osteonecrosis compared to multiple.
- +/- capsulotomy do decrease pressure.
- screw insertion:
- perpendicular to physis, start on anterior surface of proximal femur to cross perpendicular to the physis. Start point should not be medial to interrochanteric line or will resulted in impingement
- > =5 threads across the physis needed, less than 5 has 41% risk of progression of slip.
SCFE contralateral hip ppx pinning
for patients at risk:
<10, open triradiate cartilage, obese males, endocrine disorders.
Risk of contralateral slip in a scfe?
Surgeons should discuss the risk of contralateral slip (25% to 60% reported incidence) using the modified Oxford bone score. An open triradiate is an indication for contralateral fixation. Radiation exposure and endocrine, chromosomal, and renal pathologies are indications for contralateral fixation.
If not ppx pinned, then monitor every 6 months
Rate of osteonecrosis stable vs unstable for SCFE?
Standard of care? Goal of surgery? Timing of surgery? Decompression? Any reduction needed?
- Unstable slips result in osteonecrosis more often (4.7% to 58%) than stable slips (zero to 1.4%).
- insitu screw epiphysiodesis. Stable SCFE may be managed via a single, fully threaded center-center screw placed perpendicular to the physis of the capital epiphysis.
- unstable: AAOS says 2 screws
- Goal to prevent additional slip, increasing deformity, and increasing risk of osteonecrosis.
- Timing is controversial
- Decompression of intra-capsular hematoma recommended in unstbale SCFE to decrease risk of osteo
- Serendipitous reduction (positional) is acceptable, closed forceful reduction contraindicated.
- some places are doing ledbeter, parsch or modified dunn teniques w/ femoral head perfusion monitored via doppler or ICP probes to decrease risk of osteo during procedure
- protected WB for 6 weeks post op
- 6.5 mm cannulated screws
- The addition of a second screw of similar size or the use of two smaller screws often is recommended in patients with unstable SCFE. Studies recommend a minimum of four threads within the epiphysis.