Hi,
You did not mention the age of your brother in law and for what reason, he underwent
knee replacement.
Assuming that he was suffering from
osteoarthritis these could be the causes of his calf pain.
1. The most common one in osteoarthritis patients is varus deformity i.e. legs starts bending inwards, if that was the reason, he will be relieved with calf
muscle pain now as he underwent the replacement surgery in which deformity is also corrected.
2. Calcium and vitamins deficiencies are also one of the cause, so start taking supplements.
3. Sodium potassium imbalance is also a cause for calf muscle pain, so take oral rehydration salt to correct it.
4. Wrongly designed footwear is also a cause of calf muscle pain.
5. Chronic venous malformations in calf muscles like
varicose veins, or venous incompetence can be a cause so to rule out getting a colour doppler done.
Hope I have answered your query. Let me know if I can assist you further.
Regards,
Dr. Jaideep Gaver,
Orthopaedic Surgeon