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Effects of Ulnar Collateral Ligament Reconstruction
on Pitch Movement in Major League Baseball Pitchers
Brooks Platt, B.S....
UCLR aka Tommy John Surgery
• Studies have investigated the relationship between pitch metrics and
UCLR3,4,5,6
• This is t...
UCLR had no effect on
average yearly WAR in a
career, and a decrease in
career WAR explained by
a loss in pitching time,
n...
MLB players
undergoing UCLR
from 2008-2016
n=200
n=185
n=157
MLB pitchers
included in the study
n=57
Non-pitchers n=15
Pit...
Fourseam Age-Group Analysis: Velocity
Pre-op Post-op
Measure Age
Group
12-24
Months
12-24
Months
P-value 24-36
Months
P-va...
Fourseam Age-Group Analysis: Hmov
Pre-op Post-op
Measure Age
Group
12-24
Months
12-24
Months
P-value 24-36
Months
P-value
...
Fourseam Age-Group Analysis: Vmov
Pre-op Post-op
Measure Age
Group
12-24
Months
12-24
Months
P-value 24-36
Months
P-value
...
Take Home Points and Future Discussions
• No metric of breaking pitches changed
• Fourseam fastball movement experienced a...
References
1. Conte SA, Fleisig GS, Dines JS, et al. Prevalence of Ulnar Collateral Ligament Surgery in
Professional Baseb...
Variable Effect Estimate SE t value p-value
Four-seam Fastball Velocity Intercept
100.82 2.29 43.99 <.0001
(UN) Age
-0.27 ...
Profile Plots
for each
player
Effects of Ulnar Collateral Ligament Reconstruction on Pitch Movement in MLB Pitchers
Effects of Ulnar Collateral Ligament Reconstruction on Pitch Movement in MLB Pitchers
Effects of Ulnar Collateral Ligament Reconstruction on Pitch Movement in MLB Pitchers
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Effects of Ulnar Collateral Ligament Reconstruction on Pitch Movement in MLB Pitchers

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Effects of Tommy John surgery on pitch movement in MLB pitchers.

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Effects of Ulnar Collateral Ligament Reconstruction on Pitch Movement in MLB Pitchers

  1. 1. Effects of Ulnar Collateral Ligament Reconstruction on Pitch Movement in Major League Baseball Pitchers Brooks Platt, B.S. University of Missouri, Columbia John Worley, M.D. University of Missouri, Columbia Emily Leary, Ph.D. University of Missouri, Columbia Aaron D. Gray, M.D. University of Missouri, Columbia
  2. 2. UCLR aka Tommy John Surgery • Studies have investigated the relationship between pitch metrics and UCLR3,4,5,6 • This is the first study to investigate the effects of UCLR on the movement of pitches • We hypothesized that pitches would experience a decrease in velocity and movement 12-24 months after surgery followed by a return to form 24-36 months after surgery
  3. 3. UCLR had no effect on average yearly WAR in a career, and a decrease in career WAR explained by a loss in pitching time, not performance Fastball velocity decreases relatively consistently throughout careers, whereas movement stays relatively consistent
  4. 4. MLB players undergoing UCLR from 2008-2016 n=200 n=185 n=157 MLB pitchers included in the study n=57 Non-pitchers n=15 Pitchers with previous UCLR n=28 Pitchers with insufficient data in the 12-24 month pre-op, 12-24 month post-op, or 24-36 month post-op windows n=100
  5. 5. Fourseam Age-Group Analysis: Velocity Pre-op Post-op Measure Age Group 12-24 Months 12-24 Months P-value 24-36 Months P-value Velocity <26, n=16 93.62 +/- 4.25 93.86 +/- 4.18 0.638 93.79 +/- 4.28 0.687 26-31, n=25 93.45 +/- 4.83 92.71 +/- 5.40 0.023 92.77 +/- 4.24 0.020 >31, n=9 92.11 +/- 9.76 91.86 +/- 6.70 0.615 92.31 +/- 9.20 0.695
  6. 6. Fourseam Age-Group Analysis: Hmov Pre-op Post-op Measure Age Group 12-24 Months 12-24 Months P-value 24-36 Months P-value Hmov <26, n=16 -5.93 +/- 2.64 -4.86 +/- 3.85 0.010 -4.99 +/- 2.59 0.008 26-31, n=25 -4.69 +/- 2.05 -4.50 +/- 4.59 0.507 -4.38 +/- 3.39 0.189 >31, n=9 -5.02 +/- 2.86 -5.28 +/- 9.17 0.760 -5.20 +/- 4.86 0.715
  7. 7. Fourseam Age-Group Analysis: Vmov Pre-op Post-op Measure Age Group 12-24 Months 12-24 Months P-value 24-36 Months P-value Vmov <26, n=16 9.45 +/- 1.53 9.41 +/- 1.59 0.890 9.56 +/- 1.07 0.659 26-31, n=25 9.24 +/- 2.73 8.91 +/- 2.63 0.116 8.77 +/- 2.10 0.033 >31, n=9 9.56 +/- 2.25 8.80 +/- 2.31 0.077 8.90 +/- 1.87 <0.001
  8. 8. Take Home Points and Future Discussions • No metric of breaking pitches changed • Fourseam fastball movement experienced a small but significant change • Movement decrease in the fourseam fastball is likely due to a decrease in flexion/pronation power
  9. 9. References 1. Conte SA, Fleisig GS, Dines JS, et al. Prevalence of Ulnar Collateral Ligament Surgery in Professional Baseball Players. Am J Sports Med. 2015;43(7):1764-11769. Doi:10.1177/0363546515580792. 2. Mahure SA, Mollon B, Shamah SD, Kwon YW, Rokito AS. Disproportionate trends in ulnar collateral ligament reconstruction: Projections through 2025 and a literature review. J Shoulder Elb Surg. 2016;25(6):1005-1012. doi:10.1016/j.jse.2016.02.036 3. Jiang JJ, Leland JM. Analysis of pitching velocity in major league baseball players before and after ulnar collateral ligament reconstruction. Am J Sports Med. 2014;42(4):880–885. 4. Keller RA, Marshall NE, Guest JM, Okoroha KR, Jung EK, Moutzouros V. Major League Baseball pitch velocity and pitch type associated with risk of ulnar collateral ligament injury. J Shoulder Elbow Surg. 2016;25(4):671–675. 5. Lansdown DA, BT Feeley. The effect of ulnar collateral ligament reconstruction on pitch velocity in Major League Baseball pitchers. Orthop J Sports Med. 2014. 2(2):2325967114522592. 6. Makhni EC, Lee RW, Morrow ZS, Gualtieri AP, Gorroochum P, Ahmad CS. Performance, return to competition, and reinjury after Tommy John Surgery in Major League Baseball pitchers: A Review of 147 Cases. Am J Sports Med. 2014. 42(6):1323–1332.
  10. 10. Variable Effect Estimate SE t value p-value Four-seam Fastball Velocity Intercept 100.82 2.29 43.99 <.0001 (UN) Age -0.27 0.08 -3.48 0.0009 Post-op 1 -0.42 0.21 -2.01 0.049 Post-op 2 -0.3 0.19 -1.57 0.1219 Four-seam Fastball Hmov Intercept -7.14 1.48 -4.84 <.0001 (UN) Age 0.06 0.05 1.27 0.208 Post-op 1 0.38 0.21 1.77 0.0822 Post-op 2 0.43 0.17 2.59 0.0121 Four-seam Fastball Vmov Intercept 10.69 1.29 8.27 <.0001 (UN) Age -0.05 0.04 -1.07 0.2884 Post-op 1 -0.38 0.14 -2.66 0.01 Post-op 2 -0.36 0.13 -2.64 0.0109 Curveball Velocity Intercept 86.88 2.86 30.42 <.0001 (UN) Age -0.3 0.1 -2.98 0.005 Post-op 1 0.02 0.26 0.09 0.9251 Post-op 2 -0.04 0.33 -0.13 0.8996 Curveball Hmov Intercept 3.24 2.16 1.5 0.1417 (UN) Age 0.06 0.08 0.74 0.461 Post-op 1 -0.01 0.22 -0.05 0.9565 Post-op 2 0.16 0.27 0.6 0.5521 Curveball Vmov Intercept -5.08 2.22 -2.29 0.0274 (UN) Age -0.01 0.08 -0.18 0.8583 Post-op 1 -0.12 0.24 -0.52 0.605 Post-op 2 -0.27 0.31 -0.86 0.3941 Slider Velocity Intercept 84.38 2.94 28.65 <.0001 (AR(1)) Age 0.01 0.1 0.06 0.951 Post-op 1 -0.57 0.33 -1.76 0.0826 Post-op 2 -0.49 0.25 -1.94 0.0567 Slider Hmov Intercept 3.69 2.77 1.33 0.1909 (UN) Age -0.06 0.09 -0.6 0.5533 Post-op 1 0.09 0.25 0.34 0.7347 Post-op 2 0.01 0.27 0.02 0.9826 Slider Vmov Intercept -1.78 2.44 -0.73 0.4704 (UN) Age 0.1 0.08 1.19 0.2421 Post-op 1 0.17 0.3 0.58 0.5666 Post-op 2 -0.24 0.29 -0.82 0.4151 Repeated Measures Analysis
  11. 11. Profile Plots for each player

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