SigInt (the brief camera shot of treating Joel's injury court side) tells jBIE's basketball spies a whole lot about Joel's back injury.
Observed treatment: Joel laid on his back and a team official treating Joel pulled his right leg over his left and appeared to stretch the lower back in a spiral/twisting motion.
jBIE Basketball Spy Analysis of Signal Intelligence (television broadcasts):
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Joel's injury seems to be located in the lower back in the frontier between the Thoracic and Lumbar vertebrae.
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He does not appear have a fracture. No one applies such stretching, twisting motion to any lower back problem related to fracture.
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Coach Self's quote in the Dodd article indicated that Joel's injury could be healed with four weeks of rest, but, Coach Self added, KU doesn't have four weeks left in this season to rest him. If it were to win the Madness, that would mean about 4 weeks of playing (note: this week with B12 tourney, and then three weeks of two game tourneys of the Madness.)
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Coach Self also indicates it is more "significant" than a sprain.
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What seems to be occurring on the video is stretching to stop a muscle spasm, or perhaps more likely an old fashioned attempt at an osteopathic "adjustment" of vertebrae of the lower back to "pop" the lower back; this usually means that some combination of disks, muscles, tendons and ligaments are allowing lower back vertebrae to shift out of alignment. In turn a nerve is probably getting pinched. The pinched nerve causes pain and weakness in the legs for awhile.
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"Treatments" of cold and warmth and anti inflams, combined with "adjustment" give relief and the sensation of the pain going away after while. Thus we see Joel with a happy face in street clothes apparently suffering no back pain.
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Alas, the instability can recur at almost any moment of lower back motion and the more stretching and treatments that are applied, the more the constellation of disk, muscle and ligaments that hold the vertebrae in place are stretched to relieve the problem, the more unstable that vertebral region becomes; i.e., the more prone it is to slip out again.
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The difference between the first hitch in his git along that afflicted Joel and the second appeared to be a much more severe pinching of the nerve that lead to greater pain, and to much more loss of leg strength (i.e., more pronounced limping).
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Healing involves ligaments and tendons resting until their normal range of elasticity is restored, and then exercises and weight training can be used to re-strengthen the muscles so that the constellation of ligaments, tendons and muscles can hold the vertebrae in proper alignment and prevent the disk and vertebrae from slipping an pinching the nerve.
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If the apparent nerve pinching were not occurring, and not appearing to worsen with each recurrence, he would rest, get treatments and play until it went out again, then rest, get treatments and play again. Alas, the worsening pinching of the nerve is what is probably cause for all the delay, uncertainty about time of return and further diagnostics.
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jBIE spies indicate that they have had this exact injury themselves when they were young and that it pretty much goes out without rhyme or reason, and leaves one essentially immobilized for a short while. During the adjustment one can actually feel a slight crick, or pop, and then experience sudden relief. Alas, the more it recurs the more likely it is to recur.
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jBIE spies indicate that there could be some cascading connection between the knee injury and the pressure the braced knee and altered range of motion communicated to the lower back, but, maddeningly, it could also be completely independent of the knee injury.
(Note: jBIE spies of course are completely and wildly speculating here and doing so without any insider information, just the fading recollection of having had such a nagging injury over 40 years ago that still, once in a great while, goes out.)
Rock Chalk!