Comparison of the 'Back in Action' test battery to standard hop tests and isokinetic knee dynamometry in patients following anterior cruciate ligament reconstruction

Jay R. Ebert, Peter Edwards, Justine Currie, Anne Smith, Brendan Joss, Timothy Ackland, Jens-Ulrich Buelow, Ben Hewitt

Research output: Contribution to journalArticle


Background: Limb symmetry after anterior cruciate ligament reconstruction may be evaluated using maximal strength and hop tests, which are typically reported using Limb Symmetry Indices (LSIs) which may overestimate function.

Purpose: The purpose of this study was to compare the Back in Action (BIA) test battery to standard hop and muscle strength tests used to determine readiness to return to sport (RTS).

Study Design: Prospective cohort.

Methods: Over two test sessions, 40 ACLR patients were assessed at a mean 11.3 months post-surgery. Initially, participants completed the 6 m timed hop and the single, triple and triple crossover hops for distance, and isokinetic knee extensor and flexor strength assessment. The second session involved completion of the BIA battery, including stability tests, single and double leg countermovement jumps (CMJ), and plyometric, speedy jump, and quick feet tests. Pass rates for test batteries were statistically compared, including the BIA, a four-hop battery (>= 90% LSI in every one of the four hop tests) and a combined 4-hop and strength battery (>= 90% LSI in every one of the four hop tests, as well as >= 90% for both peak knee extensor and flexor strength). LSI differences between the four standard hop tests and the BIA single limb functional tests (the single limb CMJ and the speedy jump test) were evaluated.

Results: Significantly less participants passed the BIA battery (n=1, 2.5%), compared with the four-hop test battery (n=27, 67.5%) (p

Conclusion: The BIA test battery appears to include some single limb functional tests that are more physically challenging than standard hop and isokinetic strength tests, highlighted by the significantly lower mean LSI's during the single limb BIA tests and the lower pass rate when employing the BIA protocol.

Original languageEnglish
Pages (from-to)389-400
Number of pages12
JournalThe International Journal of Sports Physical Therapy
Issue number3
Publication statusPublished - Jun 2018

Cite this