Femur epiphysiodesis and altered biomechanics

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Hi
I'm looking for advice.
13 year old female with Hemihypertrophy causing overgrowth to left tibia. Epiphysiodesis at 11 years using eight plates to the femur distal growth plate, to correct a 2-3cm limb length discrepancy. Plates were removed earlier this year as growth plates had fully developed. As expected the left knee is now 2.5cm higher than right knee but as the limb length discrepancy diminished the left knee has developed hyperextension which now measures 10 degrees of hyperextension. The surgeon has suggested this has been caused by damage to the growth plate on plate removal and that posterior growth at distal femur is faster than anterior growth. A medial/lateral knee x ray showed some growth plate still available and yet x ray from anterior knee earlier this year showed no growth plate. Surgeon is suggesting further eight plates to posterior distal femur to stop growth and allow anterior distal femur to catch up which will take a year. I am concerned about the clinical picture the two different x rays have shown as there may not be enough growth to allow the surgery to work and also whether or not hyperextension would be expected in someone with different position knees.