I'd inspect the leg for bruising, a bump or uneven area that may indicate a break.
If it's not swollen, you can try stabilizing the leg by wrapping it with some sports wrap, but it's a must that you monitor the wrappings at least a couple of times a day to make sure they are not too tight or the leg is not swelling up.
The Marek's vaccine does not prevent infection from the virus, so birds often can and do become symptomatic and present with leg issues or various other forms of the disease. The vaccine can help reduce the formation of tumors on internal organs.
If it's not swollen, you can try stabilizing the leg by wrapping it with some sports wrap, but it's a must that you monitor the wrappings at least a couple of times a day to make sure they are not too tight or the leg is not swelling up.
The Marek's vaccine does not prevent infection from the virus, so birds often can and do become symptomatic and present with leg issues or various other forms of the disease. The vaccine can help reduce the formation of tumors on internal organs.