There is some good news for Detroit Lions linebacker Jack Campbell, per the team, but details of his condition and whether he has motion in his extremities remain scarce following Monday's latest update.The Lions on Monday announced "preliminary indications are positive" for Campbell's condition.But "out of respect for Jack and his family we will not share further information at this time."PACKERS WR CHRISTIAN WATSON GETS CHECKED AT HOSPITAL AFTER SCARY INJURY, SOMEHOW RETURNS TO LAMBEAU FIELDAnd while this is somewhat uplifting and paints a picture that the player's medical situation is trending in a good direction, it leaves a lot unclear.Specifically, no one has said whether Campbell has regained full or any mobility since he was removed from the Ford Field turf on Sunday on an immobility stretcher and cart.This was the third update on Campbell's status the Lions have delivered since the end of their game against the Minnesota Vikings on Sunday.The first update said Campbell was being transported to a local hospital to be evaluated for a neck injury. The second update announced he would remain hospitalized overnight for "continued evaluation and monitoring."Neither of those updates relieved concerns about whether Campbell had movement in his extremities, either. And that is usually the first thing NFL teams want to say when violent collisions happen and players leave the field immobilized.That message, if it is to come at all, will have to continue to wait, perhaps out of caution that what is finally reported remains true.Uncertainty was very much a worry to anyone who saw the play that led to Campbell's problem.Vikings tight end T.J. Hockenson caught a pass in the middle of the field and was soon sandwiched by two Lions' defenders, including Campbell. The problem is Campbell arrived at the contact while falling to his knees and appeared to have his head slanted upward, so he made contact with his facemask rather than his shoulders and arms.Campbell immediately collapsed and lay motionless, his arms dropping to his side. On a positive note, Campbell did not require help breathing.The Lions are uncomfortably too familiar with neck and spinal cord injuries that derail NFL careers and change the direction of players' lives.Mike Utley’s career ended on Nov. 17, 1991, when the Lions guard fell forward and landed on his head while blocking against the Los Angeles Rams at the Pontiac Silverdome.Utley fractured the vertebrae in his neck and severely damaged his spinal cord. Utley was paralyzed from the chest down despite the fact he famously flashed a thumbs-up sign as he was taken from the field, a gesture that became a symbol of his determination.THE CRAIG CARTON SHOW–UNFILTERED, UNAPOLOGETIC AND UNMISSABLE. DOWNLOAD HIS DAILY PODCAST NOW!Utley later founded the Mike Utley Foundation, which supports spinal-cord-injury research, rehabilitation and adaptive sports.Reggie Brown’s career ended on Dec. 21, 1997, when the Lions linebacker struck his head while making a tackle during a victory over the New York Jets.This one was a life-threatening incident because Brown bruised his spinal cord and briefly stopped breathing. He received emergency resuscitation, neck surgery and extensive rehabilitation.Brown eventually regained the ability to walk and remains active in Texas, where he has worked in auto-dealership management and occasionally speaks about his recovery and football career, including to Texas A&M audiences.FOLLOW ARMANDO SALGUERO ON X: @ARMANDOSALGUERO