This document provides an overview of Legg Calve Perthes disease, including its definition, demographics, risk factors, pathogenesis, clinical features, investigations, classifications, management, and surgical procedures. Some key points: - It is avascular necrosis of the femoral head in children, most common in ages 4-8 years. Positive family history and low birth weight are risk factors. - Clinical features include hip/thigh pain aggravated by movement. Imaging shows stages from avascular necrosis to fragmentation to regeneration/healing. - Conservative management includes bracing for young/mild cases. Surgical containment is used for more severe/older cases to encourage spherical remodeling. - Procedures

1. LEGG CALVE PERTHES DISEASE
Dr. Bipul Borthakur,
Professor,
Dept. of Orthopaedics, SMCH

2. Overview
• Definition
• Demography
• Risk and Pathology
• Vascular supply of femoral head
• Clinical features
• Classification
• Diagnosis
• Treatment
Conservative
Containment
procedure
Salvage
Procedure

3. Definition
• Idiopathic avascular necrosis of the proximal
femoral epiphysis in children.
SYNONYMS
• Legg calve perthes disease
• Legg stress fracture of femoral head
• Osteochondritis deformans juvenalis
• Osteochondrosis of hip joint
• Coxa plana
• Pseudocoxalgia

4. Demographics
• First Described by LEGG AND WALDENSTORM
• In 1909 - PERTHES
• In 1910 -CALVE
• Incidence
– 1 in 10,000 children
• Demographics
– 4-8 years M/C
– M:F is 5:1
– Higher among lower socioeconomic class
– Race
Caucasian > East Asian and African American

5. Risk Factors
• Positive family history
• Low birth weight
• Abnormal birth presentation
• Asian and Central European decent

6. Location
• Location bilateral in 12%
– Asymmetrical, asynchronous involvement
rarely at the same stage of disease
– Symmetrical involvement suggests MED (multiple
epiphyseal dysplasia)

7. Pathogenesis
• Current suggestion : Disorder of the clotting
mechanism with deficiency of factors such as
protein C or S and Factor V Leiden mutation
(MERCERS).
• Apart from AVN there is changes in ,
1. Articular cartilage
2. Growth plate
3. Synovium
4. In Established disease-Reactive
Synovitis will be present

8. Other Theories
• Repeated subclinical trauma and mechanical
overload lead to bone collapse and repair
(multiple-infarction theory)

9. Blood supply of femoral head
• Retinacular Arteries
• Metaphyseal Arteries
• Artery of teres ligament

10. Cntnue…
• IN INFANTS :
1. Medial Ascending cervical or inferior
metaphyseal arteries of trueta
2. Lateral ephiphyseal arteries
3. Lig teres –insignificant
• IN 4 months to 4 years :
1. Lateral ephiphyseal
2. Medial ephiphyseal decrease in number

11. • IN 4 to 7 Years:
1. Ephiphyseal plate forms a barrier to
metaphyseal vessels
• IN Pre-Adolescent
1. After 7 years ligament teres artery
anastomose with lateral ephiphyseal vessels

12. Pathogenesis in Head deformity

13. Clinical features
• Intermittent pain in hip and a limp
• insidious onset
• Classical presentation- Painless limp
• Restriction of abduction and internal rotation
• Nature of pain : Aggravated by movement
reileved by rest

14. Examination
• Antalgic gait
• Muscle spasm secondary to irritated hip
• Trendelenberg positive
• Short stature
• FFD

15. Stages of Perthes disease
• Stage of Avascular necrosis
• Stage of Fragmentation
• Stage of Regeneration
• Stage of Healing

16. STAGES
STAGE 1 (Early ) Avascular Necrosis 1.Asymmetric femoral epiphyseal size (smaller
on the affected side)
2.Apparent increased density of the femoral
head epiphysis
3.Widening of the medial joint space
4.Blurring of the physeal plate
5.Radiolucency of the proximal metaphysis
STAGE 2 Fragmentation 1. Subchondral lucency (crescent sign)
2. Femoral epiphysis fragments
3. Femoral head outline is difficult to make
out
4. Mottled density
5. Thickened trabeculae
STAGE
3(Reparative )
Regeneration 1.Re-ossification begins
2.Shape of the femoral head becomes better
defined
3.Bone density begins to return

17. •
STAGE 4 Healing 1.Changes depend on the
severity the femoral head
which may be nearly
normal or may
demonstrate:
-Flattening of the articular
surface, especially
superiorly
-widening of the head and
neck of the femur
CRESCENT SIGN OR SALTER
SIGN OR CAFFEY SIGN IN
STAGE 2

18. Stage 1 :AVN Stage 2 :Fragmentation
Stage 3:Regeneration Stage 4: Healing

19. Metaphyseal changes
Metaphyseal necrosis
& lucencies
(“holes of
decalcification”)
Sagging rope sign
Radiodense line in proximal
femoral metaphysis
--It’s the Metaphyseal
response to
physeal damage

20. Acetabular changes
• Bicompartmental acetabulum appears to be
composed of 2 arc partly overlapping each other –
interpreted as the subluxated femoral head
articulating only with the lateral half of the
acetabulum moulding it into 2 compartments

21. Classifications based on Extent of
Lesion
• Catterall(Based on degree of head involvement)
• Salter & thompson(Based on radiographic cresent sign)
• Herring (lateral pillar )
• Elizabeth (Epiphysis involvement )
• Stulberg (residual femoral head deformity and joint congruence)

22. • Catterall et al.
Grade <CATTERALL> Characteristics
I (good prognosis ) Only anterolateral quadrant affected
(< ½ of epiphysis affected )
II (good prognosis ) Anterior third or half of the femoral head
III (poor prognosis) Up to ¾ of the femoral head affected ,i.e
more than half of epiphysis
IV(poor prognosis ) Whole femoral head affected (entire)

24. Head at risk sign
(Group IV Catterall)
1. Gage's sign :-
A V shaped lucency in the lateral epiphysis.
1. Lateral calcification (lateral to the epiphysis loss of
lateral support)
2. Lateral subluxation of the head. (implies loss of
lateral support)
3. A horizontal growth plate. (implies a growth arrest
phenomenon and deformity)
4. Metaphyseal Cyst
GAGE
CYST

25. Salter & Thompson Group
A:
Extent of the fracture
(line) is less than
50% of the superior dome
of the
femoral head
› good results can be
expected
Salter & Thompson Group
B:
Extent of the fracture is
more than 50% of the
dome,
› fair or poor results can
be expected

26. (Herring) Lateral Pillar Classification
There is no loss in height of the lateral
1/3 of the head and minimal density change.
Fragmentation
occurs in the central segment of the head
There is lucency and loss of height in
the lateral pillar but not more that 50% of
the original
(contralateral) pillar height. there may be
some lateral extrusion
of the head

27. (Herring) Lateral Pillar Classification
There is greater than 50% loss in the
height of the lateral pillar. The lateral pillar is
lower than the
central segment early on.
Group B/C Border – Lateral pillar is narrowed
(2-3 mm) or poorly
Ossified with approximately 50% height
■ Recently added to increase consistency
and prognosis of classification

28. Herring) Lateral Pillar Classification

29. Outcome of Herring
• Herring A - all do well without treatment
• Herring B – bone age <8 years :uniform
outcome irrespective of type of treatment.
• Herring B –bone age >8 years:surgery >brace
• Herring C- bone age <8years: surgery > brace
• Herring C –bone age > 8 years: poor outcome
• irrespective of type of containment

30. Modified Elizabethtown
classification
Stage Ia: Part or whole of
the epiphysis is sclerotic.
There is no loss of height
of the epiphysis.
Stage Ib: The epiphysis is
sclerotic and there is loss
of epiphyseal height.
There is no evidence of
fragmentation of the
epiphysis.
Stage IIa: The sclerotic
epiphysis has just begun to
fragment. One or two
vertical fissures are seen in
either the AP or the lateral
view

31. Modified Elizabethtown
classification
Stage IIIa: Early new bone
formation is visible on the
periphery of the necrotic
epiphysis and covers less
than a third of the width
of the epiphysis
Stage IIb: Fragmentation is
advanced. No new bone is
visible lateral to the
fragmented epiphysis.
Stage IIIb: The new bone
is of normal texture and
has grown over a third of
the width of
theepiphysis.
Stage IV : The healing is complete and there is no radiologically identifiable avascular bone.

33. Clinical course of disease
Ref :Waldenstrom et al, Observed that clinical course is
variable. He divided into 4 stages

34. MANAGEMENT
INVESTIGATIONS TREATMENT
-CONSERVATIVE
-SURGICAL

35. INVESTIGATIONS
• Hematological parameters
• ESR
• CRP
• RA factor.
• Coagulability profile.
• X-rays
• CT scan
• MRI
• Arthrography
• Scintigraphy.

36. Role of Scintigraphy
• Effective means of diagnosing perthes disease in its early
stages much before radiographic changes are apparent.
• extent of necrosis,
• reveals revascularization and the stage of the disease.

37. Role of CT
CT is of benefit in later stages of the disease to
evaluate pain, locking of joint and other
mechanical symptoms

38. Role of USG
• Early stages of perthes disease to
demonstrate joint effusion
• Later stages to assess shape of femoral head
• Blood flow in femoral head.
• USG with microbubble contrast enhancement used to
evaluate vascularisation of femoral head

39. Arthrography
• Demonstrates actual contour of femoral head and state of
congruity of articular surfaces.
• Info ----Containment of femoral head within acetabulum.
• Major advantage is that examiner can assess
congruity of hip in different positions.

40. MRI
• Early diagnosis of perthes disease.
• Epiphyseal involvement
• Diagnostic accuracy: 97-99%.
• Revascularisation and extent of femoral head
necrosis.

41. Treatment plan
Variable Contain Do not contain
Age of onset >7 or <7 with extrusion <7 (no extrusion) or >12
Extent of
involvement
Half or more than half of
epiphysis
Less than half of the
epiphysis
Stage of the
disease
Stage I a, I b, II a Stage III a, III b, IV
Extrusion Present (in child under 12
years at onset of disease)
OR
Absent in children between
7 and 12 years
Absent (in child under 7
years
at onset of disease)
Range of hip
motion
Normal Restricted

42. PRESENTGUIDELINES
FAVOURABLE OUTCOME
(<1/2 head + no extrusion)
(Catterall I&II,Herring A,B)
UNFAVORABLE OUTCOME
(whole head + lateral extrusion)
Catterall III & IV,herring C,Head
@risk sign
<7
yrs
>7
yrs
1.Braces
2.Periodic
review
1.Surgical
containment
Symptomatic Rx
Periodic radioligical
review

43. Management
• In Active Phase(Early Stage ) ;
a. Children age 4 years – Counsel the parents -expected
duration of the disease (24 to 36 months).
Children 2 to 3 years old –No need aggressive treatment.
b. Once synovitis resolves active and assisted range-of motion
c. If loss of motion is significant, and subluxation laterally is
occurring, bed rest, skin traction, progressive passive and
active physical therapy, abduction exercises, and pool therapy,
d. If there is no improvement -percutaneous adductor longus
tenotomy, followed by an ambulatory abduction cast (Petrie)
for 6 weeks or more.

44. Goals in Management
• There is a importance of the timing and the indications
for surgery, rather than the type of procedure
• Main aim is the containment of femoral head
• Deformation occurs during the phase of
revascularization (fragmentation) & early regeneration
(ossification).
• For containment is to succeed, it would need to be
performed before the late phase of fragmentation, i.e.,
in stages of AVN or early fragmentation

45. Rationale of Containment
• Containment of the head within the acetabulum is
reported to encourage spherical remodelling during
the reossification and subsequent phases.
• However if there is total head involvement and the
lateral pillar collapses then the effect of containment
is probably less.

46. How long Containment?
Needs to be ensured until the healing process
and beyond the stage where epiphysis is
vulnerable to deformation that is until the late
stage of regeneration phase ( 2 yrs)
Conservative Surgical

47. Braces and Orthosis
(indicated <5 years of age )
• Non Ambulatory weight releiving
• 1. Abduction broomstick plaster cast
• 2. Hip spica cast
• 3. Milgram hip abduction orthosis
• Ambulatory Both limbs included
• 1. Petrie Abduction cast
• 2. Toronto orthosis
• 3. Newington orthosis
• 4. Birmingham brace
• 5. Atlanta Scotish Rite Brace
• Ambulatory unilateral
• 1. Tachdjian trilateral socket orthosis

48. Atlanta Scotish Rite
Brace
Newington
orthosis
Birmingham brace
Toronto Brace
Tachdjian
trilateral
socket orthosis
BROOMSTICK CASTS

49. Radiographic evidence of healing
1. Appearance of regular ossification in the femoral
head.
2. Increased density of femoral head should
disappear.
3. Metaphyseal rarefaction involving the lateral
cortex of the metaphysis should ossify.
4. There should be intact lateral column.
5. There should be normal trabecular bone in the
epiphysis.

50. Osteotomies

51. Varus derotation osteotomy
• If all movements are normal VDO should be
considered.
• If abduction is normal and internal rotation is
restricted, VEO should be done.
• Produces same results as pelvis osteotomy.
• It has less chances of surgical risk (sciatic nerve
injury) and no intra-articular increase in pressure.

52. • Advantages:
- Ability to obtain maximal coverage of femoral head.
- Ability to correct excessive femoral anteversion.
• Disadvantages:
- Excessive varus angulation that may not
correct with growth.
- Shortening of already shortened limb
- Non-union, implant removal, premature closure
of epiphysis.

53. Level of osteotomy level
of lesser trochanter or
slightly distal
Insertion of guide pin and
reaming of femur
Plate and compression screw
application Insertion of bone screws.
Spica cast is worn for 8-12 weeks and
internal
fixation can be removed after 1-2
years.
First depth marking flush with lateral cortex
Removal of wedge to customize it

54. Innominate Osteotomy
• Salter, Triple and shelf acetabuloplasty are
pelvic osteotomy for Perthes disease.

55. Overview of Pelvic Osteotomy

56. • Advantages :
• Anterolateral coverage of femoral head
• Lengthening of extremity
• Avoidance of second operation for plate removal
• Disadvantages:
• Possibility of improper containment of femoral head
• In acetabular and hip joint pressure --further
avascular changes in the femoral head
• In limb length on operated side which may lead to relative
adduction of the hip and femoral head uncovering.

57. Salter osteotomy
• Osteotomy made from AIIS to Greater Sciatic Notch
• Graft is taken from iliac crest and trained to the shape of a
wedge
• The distal segment is shifted forward, downward and outward
Place the graft into open segment anteriorly.
• Secure it by passing a Kwire from proximal fragment through
graft into distal fragment taking care not to enter acetabulum

58. STEEL’s TRIPLE INNOMINATE
OSTEOTOMY
1. Osteotomy made from AIIS to
Greater Sciatic notch
2. Ischial ramus is divided
posterolaterally at 45 from
perpendicular.
3. Superior pubic ramus is divided
posteromedially 15 from
perpendicular.

59. Reconstructive surgery
• Valgus extension osteotomy
• Cheilectomy
• Shelf osteotomy by staheli
• Chiari osteotomy
INDICATIONS :(In Residual stage )
1.Malformed head with femoroacetabular impingement-
Cheilectomy(Osteochondroplasty)
2.Coxa magna –Shelf Osteotomy
3.Large malformed head with subluxation – chiari ostetomy
4.Femoral capital epiphyseal arrest – Thethering Of
GT(advancement )

60. SHELF OSTEOTOMY
BY STAHELI CHIARI OSTEOTOMY
ARTHRODIASTASIS
-Late onset Perthes/severe type

61. Assesment grading by Mose
• Good- CE angle 20 degrees or more.
• Fair -CE angle of 15-19 degrees
• Poor- CE angle less than 15 degrees
LINE 1: Vertical line passing
through centre of head
LINE 2 :Perpendicular to line 1
LINE 3 :CE line from centre
of head to the edge
of acetabulum

62. PROGNOSIS
• AGE – important factor ,<6 good prognosis
• Girls poorer Prog than Boys
• Caterall –greater the degree of head inv-
poorer outcome
• Poor prognosis – “HEAD @RISK SIGN,GAGE
SIGN POSITIVE”
• HERRING group C –poor