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Manzi JE, Kunze KN, Meza B, et al. Decreased Trunk Rotation at Foot Contact in Professional Baseball Pitchers with Prior, Conservatively Managed Superior Labrum Anterior and Posterior Tears: A Propensity-Score Matched Analysis. Arthroscopy. 2021;doi: 10.1016/j.arthro.2021.11.009.
Manzi, J. E., Kunze, K. N., Meza, B., Trauger, N., Quan, T., Rauck, R. C., Carr, J. B., & Dines, J. S. (2021). Decreased Trunk Rotation at Foot Contact in Professional Baseball Pitchers with Prior, Conservatively Managed Superior Labrum Anterior and Posterior Tears: A Propensity-Score Matched Analysis. Arthroscopy : the journal of arthroscopic & related surgery : official publication of the Arthroscopy Association of North America and the International Arthroscopy Association, . https://doi.org/10.1016/j.arthro.2021.11.009
Manzi, Joseph E, et al. "Decreased Trunk Rotation at Foot Contact in Professional Baseball Pitchers with Prior, Conservatively Managed Superior Labrum Anterior and Posterior Tears: A Propensity-Score Matched Analysis." Arthroscopy : the journal of arthroscopic & related surgery : official publication of the Arthroscopy Association of North America and the International Arthroscopy Association vol. (2021). doi: https://doi.org/10.1016/j.arthro.2021.11.009
Manzi JE, Kunze KN, Meza B, Trauger N, Quan T, Rauck RC, Carr JB, Dines JS. Decreased Trunk Rotation at Foot Contact in Professional Baseball Pitchers with Prior, Conservatively Managed Superior Labrum Anterior and Posterior Tears: A Propensity-Score Matched Analysis. Arthroscopy. 2021 Nov 13; doi: 10.1016/j.arthro.2021.11.009. Epub 2021 Nov 13. PMID: 34785298.
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Arthroscopy. 2021 Nov 13; doi: 10.1016/j.arthro.2021.11.009. Epub 2021 Nov 13.

Decreased Trunk Rotation at Foot Contact in Professional Baseball Pitchers with Prior, Conservatively Managed Superior Labrum Anterior and Posterior Tears: A Propensity-Score Matched Analysis.

Arthroscopy : the journal of arthroscopic & related surgery : official publication of the Arthroscopy Association of North America and the International Arthroscopy Association

Joseph E Manzi, Kyle N Kunze, Blake Meza, Nicolas Trauger, Theodore Quan, Ryan C Rauck, James B Carr, Joshua S Dines

Affiliations

  1. Weill Cornell Medical College, New York, NY.
  2. Sports Medicine Institute Hospital for Special Surgery, New York, NY.
  3. Cornell University College of Engineering, Ithaca, NY.
  4. George Washington University School of Medicine, Washington, DC.
  5. Sports Medicine Institute Hospital for Special Surgery, New York, NY. Electronic address: [email protected].

PMID: 34785298 DOI: 10.1016/j.arthro.2021.11.009

Abstract

PURPOSE: To compare kinematic and kinetic parameters between a cohort of fully recovered professional pitchers with prior shoulder injury treated conservatively compared to a cohort with no prior shoulder injury.

METHODS: Twenty-six fully recovered professional baseball pitchers with a history of shoulder injury treated conservatively pitched 8-10 fastball pitches using 3D-motion capture (480 Hz). All shoulder injuries occurred within a 1-4 year timespan from biomechanical evaluation and were severe enough to prevent pitchers from playing between 1-12 months. These pitchers were 4:1 propensity-scored matched by age, height, weight, handedness, and ball velocity to pitchers with no prior injury history (control). Twenty-two kinematic and eleven kinetic parameters were compared between groups using appropriate parametric testing. Sub-analysis comparisons of pitchers with prior superior labrum anterior-posterior (SLAP) injury as well as rotator cuff tendinitis were also performed.

RESULTS: SLAP tears (n=11, 42.3%) were the most frequently reported injury, followed by rotator cuff tendinitis/shoulder impingement (n=7, 26.9%). Compared to the control group, the twenty-six prior injured pitchers showed no significant differences across kinematic and kinetic factors. However, the SLAP tear subgroup did demonstrate significantly less trunk rotation at foot contact compared to control (34.1±4.9 vs. 39.2±10.2°, p=0.0075).

CONCLUSION: Fully recovered professional baseball pitchers with shoulder injuries treated conservatively showed no significant differences in kinetics or kinematics compared to their propensity-matched counterparts, suggesting shoulder injury alone may not greatly alter pitching mechanics. However, while prior groups have demonstrated a decrease in trunk rotation at foot contact after surgical repair for SLAP tear, our study suggests that this kinematic change may alternatively originate with the injury itself.

CLINICAL RELEVANCE: Understanding the etiology of biomechanical adaptations by pitchers after injury can better aid clinicians and coaching staff in providing individualized and specific care to the throwing athlete.

Copyright © 2021. Published by Elsevier Inc.

Keywords: Motion-capture; SLAP; baseball; injury-risk; rotator cuff

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