Single-Leg Vertical Hop Test Detects Greater Limb Asymmetries Than Horizontal Hop Tests After Anterior Cruciate Ligament Reconstruction in NCAA Division 1 Collegiate Athletes

Michael J. Zarro*, Matthew G. Stitzlein, Jason S. Lee, Robert W. Rowland, Vicki L. Gray, Jeffrey B. Taylor, Sean J. Meredith, Jonathan D. Packer, Christa M. Nelson

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Background Knee function deficits may persist after anterior cruciate ligament reconstruction (ACLR). Return to sport (RTS) testing batteries assess recovery after ACLR and can guide RTS progression, but the ideal test components are debatable. The single leg vertical hop for height (SLVH) test using a commercially available jump mat may provide a valuable assessment of knee function. Hypothesis/Purpose The purpose of this study was to compare the limb symmetry index (LSI) of SLVH to horizontal hop testing in a cohort of National Collegiate Athletic Association (NCAA) Division 1 collegiate athletes after ACLR. The hypothesis was the SLVH would elicit significantly lower LSI than horizontal hop tests. Study design Cross-Sectional Study Methods Eighteen National Collegiate Athletic Association (NCAA) Division 1 collegiate athletes (7 males, 11 females) at 7.33 ± 2.05 months after ACLR were included in this retrospective study. LSI was calculated for single hop for distance (SHD), triple hop for distance (THD), cross-over hop for distance (CHD), timed 6-meter hop (T6H), and SLVH. A repeated measures ANOVA was performed to identify differences in LSI for each test. Spearman’s Rho correlation coefficient was calculated to examine the relationship between LSIs for each test. Results The LSI for SLVH (84.48% ± 11.41%) was significantly lower than LSI for SHD (95.48 ± 8.02%, p = 0.003), THD (94.40 ± 3.70%, p = 0.002), CHD (95.85 ± 7.00, p = 0.007), and T6H (97.69 ± 6.60%, p = 0.001). The correlation of LSI between SLVH and the horizontal hop tests was weak and non-significant for SHD (rs = 0.166, p = 0.509), CHD (rs = 0.199, p = 0.428), and T6H (rs = 0.211, p = 0.401) and moderate and non-significant for THD (rs = 0.405, p = 0.096). Conclusions Individuals after ACLR had lower LSI on the SLVH than on horizontal hop tests and weak to moderate correlations between the tests suggest SLVH detects performance deficits not identified by the horizontal hop tests. Level of evidence 3.

Original languageEnglish (US)
Pages (from-to)1405-1414
Number of pages10
JournalInternational Journal of Sports Physical Therapy
Volume16
Issue number6
DOIs
StatePublished - 2021
Externally publishedYes

Keywords

  • Acl reconstruction
  • Anterior cruciate ligament
  • Hop testing
  • Movement system
  • Rehabilitation
  • Return to sport

ASJC Scopus subject areas

  • Physical Therapy, Sports Therapy and Rehabilitation
  • Rehabilitation
  • Orthopedics and Sports Medicine

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