Hi there , thanks for your question at HCM. The swelling, bruise and the pain will reduce gradually over 7 to 10 days. Rest, Ice and bandage application with limb elevation on two pillows accelerates the process of healing over first 2 to 3 days.I would ask you to follow these four things. However by third day you should experience considerable pain relief and should be able to walk with mild pain.Since you are already able to walk, any major injury/ fracture can be ruled out. Pain after bending for some time and after prolonged extension of knee , can suggests internal derangement of soft tissue structures inside your knee. This can cause pain on movements like bending, squating, geting up from a chair, twisting movements associated with going up and down stairs.In more severe forms it can be associated wity stiffness of knee wity inability to bend fully, giving way or popping sensation and more severe pain.If you cannot manage your daily routine without pain, it will be prudent to meet a sport physician and let her/him evaluate your knee. Also pain while going up and down the stairs can suggest some injury to associated ligaments of the knee. Hope this helps. All the best.Regards. Dr.SBK