Final answer:
The exact percentage of physis damage necessitating epiphysiodesis is not provided, but the procedure is considered based on the extent of damage and the clinical scenario. Understanding the ossification process of bones, especially the timing of epiphyseal plate closure, is crucial in making decisions about such interventions.
Step-by-step explanation:
The question of what percentage of the physes (epiphyseal plates) must be damaged before epiphysiodesis is indicated is not explicitly answered by the provided material. Epiphysiodesis is a surgical procedure to arrest growth in a bone by destroying the growth plate. The decision to perform this procedure typically depends on the specific clinical scenario, including factors such as the extent of damage to the growth plate, the expected impact on future bone growth, and the presence of leg length discrepancies or angular deformities.
If a significant portion of the physis is damaged and growth alteration is anticipated, epiphysiodesis may be considered as an intervention to prevent further deformity. However, the provided content loaded with information about the development and ossification of bones such as the process involving the femur and its secondary ossification centers would be critical in understanding the timing of potential epiphysiodesis procedures. Knowledge of when different epiphyseal plates close is important for interpreting pediatric radiographs and making informed decisions about interventions like epiphysiodesis. Damage to these plates can lead to incorrect fusion and bone growth problems. Therefore the percentage of damage requiring epiphysiodesis would be determined by the treating orthopedic surgeon based on a thorough evaluation of each individual case.