Deepak Chona, MD. SMA Profile picture
Data-driven injury and sports performance expert - NFL/NBA/MLB/fantasy football. Stanford, Harvard-trained sports surgeon. Featured on ESPN, NBC, The Athletic
Apr 4 10 tweets 2 min read
PSA 4 Athletes:

Becoming elite = part mechanics, part biology, part psychology

Most people train their bodies but ignore their operating systems.

If you want to perform at the highest level, you need to audit your mental and physiological frameworks. 🧵

1/10 1) The "Physiological Sigh"

Pressure creates shallow breathing, triggering "Fight or Flight" + killing fine motor skills

The Fix: Double inhale through the nose + long exhale through the mouth

The Data: Fastest way to offload CO2​ + lower your heart rate in real-time

2/10
Mar 28 10 tweets 2 min read
#NFL Injury Updates

#Buccaneers Bucky Irving - Post-injury '25: ~70% dip in rec, rec yds. ~40% dip in YAC/car. Now post-shoulder surgery. Data favors 100% pre-injury form

#Chiefs Patrick Mahomes - Likely ready Wk 1. QBs see mobility dip (but not passing) until ~12 months

1/10 #NFLDraft Jordyn Tyson - Risky. No red flag. '22 ACL-MCL-PCL = resolved. A 2nd injury to this knee could = huge drop-off

'24 clavicle fracture = no lingering risk

Now hamstring, despite no games for ~4 months. Most likely 100% by OTAs, but higher long-term risk than most

2/10
Sep 4, 2025 10 tweets 3 min read
#NFL Injury Updates

#Dolphins De'Von Achane - LP. Unless setback occurs, data strongly favors playing. Re-injury risk likely low (~10%) given that it took only 2 wks to return to practice

#Ravens Isaiah Likely - Out. Wk 2-4 return = likely. Data suggests 4 game ramp up

1/10 #Dolphins Tyreek Hill - LP. Likely playing. If LP x3, most WR stats wouldn't dip Wk 1

#Rams Matthew Stafford - Expect ~100% Wk 1. Very high in-season risk.

#Packers Micah Parsons - Different than Stafford. Facet not as severe as disc/nerve issue. Lean toward playing Wk 1

2/10
Jun 18, 2025 6 tweets 1 min read
#NFL Injury Updates:

#Giants Malik Nabers - Yellow flag. Not huge red. Chronic toe elevates risk in-season, but often see missed time in June that doesn't cause problems by Sept

#Buccaneers Chris Godwin - Expecting slow start (80% Wk 1) and progressive ramp up (90% Wk 8)

1/6
#Chiefs Isiah Pacheco - Returned only 10 wks post-ankle fracture. '24 dip = heavily expected. Now projects for 90% by Wk 1. Value potential at RB 29

#Eagles Saquon Barkley - High volume last year doesn't necessarily mean injury this yr. Injury history relatively mild

2/6
Nov 18, 2024 7 tweets 2 min read
#NFL Injury Updates:

#Cowboys CeeDee Lamb - Comments suggest mild severity. Having 2 injuries carries high re-aggravation risk. Would still start him

#Chiefs Isiah Pacheco - High risk start Wk 12. Data projects major stats dip + workload limits. Avg ramp up = 4-6 wks

1/7
#Texans Nico Collins - Data suggests we can confidently plug and play. Projects 90% of pre-injury baseline production. 15% re-injury risk next 6 wks

#Falcons Darnell Mooney - Hamstring today. Avg = 2 wks. Mild Achilles strain this wk. Wk 12 bye, but Wk 13 in doubt

2/7
Nov 11, 2024 9 tweets 2 min read
#NFL Injury Updates:

#Texans Nico Collins - Likely inactive cuz each wk lowers re-injury risk (~15% right now). If no setback, data favors Wk 11 return at 90+%

#Bills Dalton Kincaid - Video suggests contusion vs PCL sprain. MRI Mon. Suspect short-term (if any) absence

1/9
#Dolphins Tyreek Hill - Social posts suggest playing. Practice data (DNP x2) favors sitting. If active, consider him high risk for re-aggravation + extended absence

#Vikings Aaron Jones - Likely rib/chest contusion. Often played thru w/2-4 wk production dip

2/9
Nov 5, 2024 7 tweets 2 min read
#NFL Injury Updates:

#Chiefs Patrick Mahomes - Likely mild re-injury. Has played thru severe ankle before

#Eagles AJ Brown - Contusion +/- MCL. Lean to playing Wk 10 w/o major dip

#Cowboys CeeDee Lamb - Likely playing. ~20% dip projected, worse if he falls on it in-game

1/7
#Cowboys Dak Prescott - TBD, suspect IR coming

#Falcons Drake London - Data favors return Wk 10 + mild dip

#49ers Christian McCaffrey - Expect load management + strong efficiency. Lean towards Wk 10 return

2/7
Oct 17, 2024 10 tweets 2 min read
#NFL Injury Updates:

#Rams Cooper Kupp - Wk 7 TBD. Data slightly favors sitting, return Wk 8. Video below has more

#Giants Malik Nabers - Likely return Wk 7. No dip

#Patriots Drake Maye - Likely injured today. MRI pending. Doesn't necessarily mean major problem

1/10 #Browns Nick Chubb - FP. Likely playing Wk 7. Data projects ~25-50% workload + efficiency dip

#Packers Jayden Reed - LP. Anklee. Left + returned mid-Wk 6, but w/limited production. Data favors playing + mild dip Wk 7

#Saints Derek Carr - Oblique. Chance to return Wk 8

2/10
Oct 7, 2024 9 tweets 2 min read
#NFL Injury Updates:

#Texans Nico Collins - Re-aggravation avg = 2 wks. Video + comments suggest mild severity. Lean towards Wk 6-7 return. Practice = key

#Dolphins DeVon Achane - Concussion avg = 1 wk out. Wk 6 bye means most likely playing Wk 7 w/o missed time

1/9
#Chiefs Rashee Rice - Lean towards season over. Getting exam while in surgery Mon. Injury mechanism + initial concerns for ACL suggest knee is unstable. Best case ~6 wks

#49ers Christian McCaffrey - Avg ramp up = 4-6 wks. Lean towards Wk 8-10 return. High re-injury risk

2/9
Sep 17, 2024 10 tweets 2 min read
#NFL Injury Updates:

#Rams Cooper Kupp - Comments suggest severe high ankle. Avg = 5 wks. Age>30 predicts slower return. Lean towards ~Wk 8 return w/high re-injury risk

#49ers Deebo Samuel - WR calf avg = 2-3 wks. Problem = HIGH re-injury risk. Lean towards ~Wk 6 return

1/10 #Eagles AJ Brown - WR hamstring avg = 2 wks. Limited info on severity. Data slightly favors missing Wk 3 but Wed + Thurs practice reports = key. High re-injury risk next 6-8 wks

#Chiefs Isiah Pacheco - Reports = 6-8 wks. Data leans towards 8, but w/major dip for '24

2/10
Aug 15, 2024 10 tweets 2 min read
#NFL Injury Updates:

#Vikings Jordan Addison - Reports suggest low concern. Data favors Wk 1 return at ~100%. WRs carry mildly elevated re-injury risk 1st 3 wks back

#49ers Christian McCaffrey - Likely playing Wk 1 at ~100%. Slightly elevated re-injury risk thru Wk 4

1/10 #Lions Jahmyr Gibbs - Data favors playing Wk 1 at 90% efficiency. RBs do tend to see fewer touches upon initial return. In-season risk 25% higher than avg RB

#Rams Matthew Stafford - Hamstring "tightness" suggests one level below "strain". Low concern at this point

2/10
Aug 12, 2024 11 tweets 2 min read
#NFL Injury FAQ:

#Packers MarShawn Lloyd - Re-aggravation = worse than 1st time. Avg = 3 wks. Data favors playing Wk 1 but w/moderate re-injury risk thru Wk 6

#Chargers Justin Herbert - Unlikely to miss time. May see decreased mobility if foot flares up in-season

1/11 #Giants Malik Nabers - Reports suggest mild ankle sprain. If so, wouldn't expect any performance hit or lingering injury risk by Wk 1

#Steelers Roman Wilson - Images suggested high ankle. Data projects 90% by Wk 1 but re-aggravation risk elevated thru ~Wk 2

2/11
Oct 28, 2023 24 tweets 4 min read
#NFL Injury Updates:

#Dolphins Tyreek Hill - Playing. Likely was conservative management to miss practice. Data projects low performance impact

#49ers Brock Purdy - Rare, but on pace to play. Had clear performance dip Wk 7 after what was presumably hit that caused injury

1/24 #Bengals Joe Burrow - Expect major improvements in mobility and scrambling. Re-injury risk still elevated x2 weeks

#Chargers Austin Ekeler - Wk 7 video suggested new low ankle but practice participation suggests very minor. Expect 100% efficiency w/o workload limits

2/24
Oct 24, 2023 15 tweets 3 min read
#NFL Injury Updates:

#Packers Christian Watson - Comments suggest mild knee sprain. Avg = 2 wks but he will likely attempt to play Wk 8 w/mild performance hit

#Chargers Austin Ekeler - Picked up new low ankle sprain. Most don't cause missed games but do lower RB workload

1/15 #Eagles Jalen Hurts - QB knee data = favorable. Likely playing Wk 8 w/o stats dip. But highlights concerns about rushing QB playing style causing durability issues

#Dolphins Jaylen Waddle - Likely playing Wk 8, low stats impact. Mild re-aggravation risk next 3-4 wks

2/15
Oct 23, 2023 5 tweets 1 min read
#NFL Injury Updates:

#Packers Christian Watson - Concern for ACL +/- MCL/meniscus. Best case = sprain (MCL +/- bone bruise) - that would avg 2-3 wks. MRI tomorrow

#49ers Christian McCaffrey - Data suggests low per-touch efficiency impact but fewer touches if SF in control

1/5
#49ers Deebo Samuel - Likely return Wk 10 (Wk 9 = bye). Fracture pain improves a lot over 3-4 wks so don't expect stats dip upon return

#Browns Jerome Ford - Video + boot suggests high ankle. Avg = 3 wks out but his looked mild since foot wasn't planted. Lean 2 wks for now

2/5
Oct 17, 2023 24 tweets 4 min read
#NFL Injury Updates:

#49ers Christian McCaffrey - Most of these aren't long injuries. MRI pending but avg = 1-2 wks + low performance impact

#Bears Justin Fields - Swelling = expected. Likely know if surgery right away. If no surgery, expect 2-3 wk absence

1/24 #49ers Deebo Samuel - Avg = 1-2 wks but Deebo typically plays thru minor injury. Lean towards playing Wk 7 + mild performance hit

#Giants Saquon Barkley - Star RB data from high ankle generally progresses from 80 - 90 - 90 - 100% efficiency. Wk 7 = second week of that

2/24
Sep 9, 2023 14 tweets 3 min read
#NFL Injury Updates:

#Giants Darren Waller - TBD. Lean towards playing. Comments = mild severity. Data suggests low stats impact, high injury risk for year

#Jets Breece Hall - Our algorithm projects 85% explosiveness, 40% of normal workload. Data suggests full load ~Wk 4

1/14 #Ravens Mark Andrews - TBD. Lean towards playing. Moderate quad strain data says low performance dip but ~15% re-aggravation risk

#Broncos Jerry Jeudy - TBD. Data says 60% chance of playing. If active, has HIGH (~20-25%) re-injury risk, moderate (~15%) performance hit

2/14
Sep 7, 2023 6 tweets 1 min read
#NFL Injury Updates:

#Chiefs Travis Kelce - Could inject knee & play well vs Lions. But would have HIGH injury risk. Data favors sitting Wk 1, return Wk 2

#Rams Cooper Kupp - Data predicts Wk 3 return. Nerve recovers slower if involved. IR possible, but would be outlier

1/6
#Broncos Jerry Jeudy - Possible to play Wk 1, but hustling back brings ~25% re-injury risk. Data favors Wk 2 return. Moderate explosiveness dip initially

#49ers George Kittle - Trajectory + history of playing thru injury favor playing Wk 1. Low performance impact if active

2/6
Aug 23, 2023 7 tweets 1 min read
Data-driven draft strategy:

Round 1:

(1) WRs > RBs. 15-20% less likely to miss games

Full send: Justin Jefferson, Ja'Marr Chase, Tyreek Hill, Stefon Diggs

1/7
Round 1:

(2) Caution on:

Cooper Kupp - Hamstring = 15% recurrence. Stafford = high risk if O line is weak again

Travis Kelce, Austin Ekeler, Derrick Henry- Age = injury risk factor for position

2/7
Aug 10, 2023 6 tweets 1 min read
#FantasyFootball Injury risk categories to know.

(1) Zero hesitation on WRs who consistently line up wide:

Justin Jefferson
Ja'Marr Chase
Tyreek Hill
Stefon Diggs
Davante Adams

1/6
(2) Relatively safe = RBs who get touches through receptions:

Christian McCaffrey
Austin Ekeler
Bijan Robinson
Saquon Barkley

2/6
Aug 8, 2023 8 tweets 2 min read
#NFL Injury Updates:

#Rams Cooper Kupp – Comments suggest low severity. Highly likely to return by Wk 1 at 100%. Mildly increased re-injury risk.

#Bengals Joe Burrow – Expect return by Wk 1 at 100%. Progress so far implies low severity, relatively low re-injury risk.

1/8
#Chiefs Isiah Pacheco – Expect clearance in ~2 wks. RBs off of labrum repair return at ~100%, no major re-injury risk.

#Chiefs Kadarius Toney – Expect return 3-4 wks. No performance hit expected upon return.

2/8