Genu Valgum Treatment & Surgery

Knock KneesGenu

Valgum

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DEFINITION• Defined by position of knees such that,

when standing with knees together, the medial malleoli are not touching.

Normal Development• Most children are “bowlegged” from birth

until around 3 years old, then become “knock kneed” until age 4 to 5, and straighten towards adult alignment by age 6 to 7.

CAUSESUnilateral

• Asymmetric growth:

1-Trauma.

2-Infection.

3-Tumor to tibia.

Bilateral• Physiological: common• Metabolic: renal

osteodystrophy, rickets, hypophosphatemia.

• Neuromuscular: cerebral palsy.

• Haemotological: myelodysplsia

• Skeletal dysplasia: congenital dislocation of patella

Presentation• Knees touch each other while

standing.• Legs are curved inwardly.• Too much distance between feet.

EXAMINATIONIn the consultation room:

1- Always compare the two knees.

2- Watch the patient walk.

3- Looks at the knees whilst standing.

Measurement of intermalleolar distance

• intermalleolar distance is a Distance between two malleoli when the knees are gently touching with legs in adduction.

• Up to 3 and a half inches (9 centimeters) with child lying down is acceptable.

Possible Complications

• Difficulty walking (very rare).

• Self-esteem changes related to cosmetic appearance of knock knees.

• If left untreated (for patients with intermalleolar distance which is more than 9 cm and for age group < 7 years), knock knees can lead to early arthritis of the knee.

Management

RAPRIOP

Reassurance1- Most parents are happy to be reassured that their child's

deformity is within normal limits and will disappear.

2- Some may need their confidence boosted by returning for fresh measurements to be made six-monthly until they are convinced it is disappearing.

3- For those who are still sceptical, radiographic examination may be sufficient to alleviate their anxiety with or without the addition of an orthopaedic opinion.

Advice• To measure natural

improvement, Advice Parents to take photographs of the child in standing with their kneecaps pointing forward every 6 months.

Prescription (Treatment)

Non-Operative• Special shoes,

exercise programs, splints and braces are not recommended, as these conditions usually correct and improve over time with normal growth.

Operative

• Epiphysiodesis (physeal stapling) of medial side, or corrective osteotomy in children < 10 years old with intermalleolar distance < 10 cm.

When to Refer ?• Age > 7 years with knock knees.

• Unilateral problem i.e Asymmetry of legs.

• Intermalleolar distance > 3.5 inches (9 cms).

• Associated symptoms e.g Pain, Limp.

InvestigationsX-rays

• No X-ray required until < 18 months of age, then AP and lateral standing full leg length views.

Laboratory tests• CBC, phosphorus,

creatinine and alkaline phosphotase may be ordered if a systemic or metabolic abnormality is suspected.

Observe (Follow Up)

• Observe the patient every 6 months.

Prevention• There is no known prevention for normal

knock knees.

Thank you• .

Genu Valgum Treatment & Surgery

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