Thanks for asking me to respond. Xray only rules or injury to the bones. Ligament injuries are also common around joints. Contusion injures to the muscular tissues can also result in pain. If pain persists beyond a week, then it would be worthwhile to visit the nearest ortho surgeon who can examine you physically and obtain the appropriate investigations. I the meanwhile you can rest your leg and nor walk around too much. I cannot prescribe meds as Practo prohibits me from doing so. Get well soon!

May be muscular injury, takes three weeks to heal ,take rest and pain killers, consult orthopedic surgeon get treated