hmmm, trauma can cause a LCL to hurt, but this should result in a swelling of the whole knee, not only to the lateral side of the knee, although the LCL is an extracapsulair structure. If the LCL ruptures, this should also have impact on the other lateral structures, capsula. If an LCL is ruptured you may have instability, but not only when climbing or descending the stairs, but also with normal walking and turning. Especially on an uneven surface. Then still an ibuprofen is not the way to treat it. It only reduces the first events of inflammation, and then mainly on pain.....not on recovery. Strengthening the muscles is then the way to go, together with external support of the knee with a brace or something that gives (mental) support to head and knee ;-)
You did not perform any exercise what so ever? You only took ibuprofen and started jogging? And continue to live and use the knee in an normal way, without giving it an extra rest? Then still I would think that swelling would become less, as PT/exercises only reinforces (if performed on the right level) natural recovery...it is not initiating it. I still have enough questions and options for alternative diagnostics.
To my idea these are the options, in random order and with no order in importance:
1. IT band
2. LCL rupture in stead of sprain
2b LCL rupture with an avulsion fracture of its insertion on the head of the fibula
3. lateral meniscus
4. Myofascial trigger point in the lateral head of the mm. quadriceps
My questions:
Is the swelling of the knee the whole knee or just the lateral aspect?
Which activities except from jogging and using the stairs do aggravate the pain?
Is there a difference in ascending or descending the stairs?
Does your knee lock? (are you sometimes not able to flex or extent it?)
Is the function of the knee impaired? When you compare you left with the right knee, do they perform the same or is for example the extension (straight) less?
Does is hurt more when you it more?
Does it become worse of less when you continue to use it?
Are you able to palpate the pain? If yes, where is the most painful spot?
Are you able to fully squat?
Is there a difference in size between left or right upper leg? Use a centimeter approx. 5 cm above (cranial) of the knee cap?
Is there a marked difference in getting up from a chair using your left or right leg only?
Life is not easy over the internet. I prefer to see the patient in sight....but it is fun to get the brain working
Sietze