based on the information provided, it seems like the person has been intentionally abusing one of their legs, and as a result, it is not healing properly. The other leg is healthy and considered the source of survival. The motive for the next operation could be to address the issues with the abused leg, potentially through surgery or other medical interventions, in order to restore its functionality and prevent further complications. The x-rays taken previously might be used to assess the extent of damage and the prognosis for the abused leg, aiding the medical team in making informed decisions about the appropriate treatment.
Remember, medical situations are complex, and decisions about operations and treatments should be made by healthcare professionals after a thorough evaluation of the individual's specific condition.