To answer Chickenman from a page back. The visible pop I would explain one of two ways. If a the tibial motion is rotatory and the meniscus tears, the femur falls into the defect as the meniscus displaces and the pop is that the bones get closer together. This would likely mean a large peripheral tear that could require a repair with a 3-6 month recovery. A small peripheral tear would have a much smaller recovery time if it only required some trimming.
The second possibility, after watching a few more times, is the the motion of the tibia was posterior (toward the back), which would likely mean a PCL tear. This would likely require reconstruction in an athlete of this age. The question would be whether he could wrestle out the season and then do it or do it now depending on functional capacity of the knee and pain levels, similar to what Lee did for the end of his high school schedule.
I'm also worried about the PCL for the reasons you mentioned. A PCL injury most often occurs when a force is applied to the anterior aspect of the proximal tibia when the knee is flexed. Hyperextension and rotational or varus/valgus stress mechanisms also may be responsible for PCL tears. The most common way a PCL tear occurs outside of sports is in a car accident when your knee/shin hits the dashboard.
Here, Nolf's knee was flexed, force was being applied to the tibia via the hold on the ankle, and Nolf was forcing his femur forward over the flexed tibia. There was also rotational force being applied via the knee being crossed in front of Nolf's body and the opposing forces of Nolf trying to get up and his opponent holding the shin/ankle against himself.
Another concerning aspect for a PCL injury is that when Nolf is pulling back after the stoppage, it looks like his lower leg is sagging back compared to his femur, which would mean the PCL has torn, allowing the lower leg to move backwards. It also looked like a posterior drawer sign test was being performed by the trainer/doc (bend the knee, push back on the shin and see if there is laxity.. as opposed to the anterior drawer sign for an ACL where they bend the knee and pull forward on the shin to see if there is laxity in that direction).
Finally, there was a post on twitter last night from some woman named Lu Ann Dalessio (
https://twitter.com/LuAnnDalessio) saying that Nolf possibly tore his PCL and has a doctor's appointment at 8am this morning. She has since deleted the tweet
However, if you look at her profile, her last tweet was in 3/2017 and also about Nolf. She follows 5 accounts, 4 of those are B1Gwrestling, Flowrestling, Penn State Wrestling, and Samantha Nolf. I did some googling for a Lu Ann Dalessio and a woman by that name works on the Indiana County Municipal Services Authority.. a half hour drive from Nolf's hometown of Yatesboro. (
https://www.prwa.com/people/icmsaluann)
Here is a screen grab of the tweet preview from a text message i sent last night when the tweet was still up.
If it's a PCL, theres no way he's wrestling this year, IMO.
If you guys really want to know the answer, everyone needs to start tweeting at @ProFootballDoc with links to the video (you can use this Christian Pyles tweet
for a link to the video) It would also be helpful to send videos of the trainer examining Nolf and Nolf trying to walk. We already have the opinion of a Duke Professor/Orthopedic Surgeon in Dr. Selene Parekh, but he only saw the initial video that CP tweeted, and not the exam, etc. One other thing that points to the patella is that you can see the trainer feeling the right patella and comparing it to the left when he examines Nolf. However, I'm worried that if it is the patella, its a torn patellar tendon, not a dislocated patella. In my opinion you can pretty clearly see the trainer say to Cael 2x "it's torn" after Nolf stands up. In addition, it looks like Cody says "it's torn" when Nolf is still on the ground being examined.