Persistent knee flexor strength deficits identified through the NordBord eccentric test not seen with “gold standard” isokinetic concentric testing during the first year after anterior cruciate ligament reconstruction with a hamstring tendon autograft

To investigate the recovery of knee flexor muscle strength evaluated with a Nordic hamstring eccentric test (NordBord) compared with an isokinetic concentric test (Biodex) during the first year after anterior cruciate ligament (ACL) reconstruction using a hamstring tendon autograft. Prospective obse...

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Bibliographic Details
Published in:	Physical therapy in sport Vol. 55; pp. 119 - 124
Main Authors:	Högberg, Johan, Bergentoft, Emma, Piussi, Ramana, Wernbom, Mathias, Beischer, Susanne, Simonson, Rebecca, Senorski, Carl, Thomeé, Roland, Hamrin Senorski, Eric
Format:	Journal Article
Language:	English
Published:	England Elsevier Ltd 01-05-2022 Elsevier Limited
Subjects:	Clinical Medicine Evaluation Joint and ligament injuries Klinisk medicin Knee Knee injury Limb symmetry index Magnetic resonance imaging Muscle strength Nordic hamstring Patients Physical therapy Rehabilitation Sports injuries Sports medicine Warm up (exercise) Sweden Evaluation Limb symmetry index Nordic hamstring Knee injury
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Summary:	To investigate the recovery of knee flexor muscle strength evaluated with a Nordic hamstring eccentric test (NordBord) compared with an isokinetic concentric test (Biodex) during the first year after anterior cruciate ligament (ACL) reconstruction using a hamstring tendon autograft. Prospective observational registry study; level of evidence, 3. Primary care. Cross-sectional data of 127 patients (45% women, mean age 24.9 ± 8.1 years) were extracted from a rehabilitation outcome registry at 10 weeks and 4, 8 and 12 months after ACL reconstruction with hamstring tendon autograft. All patients performed a concentric Biodex test, and an eccentric NordBord test on the same occasion or within seven days of the concentric test. The primary outcome was the limb symmetry index between the respective tests. A greater knee flexor symmetry deficit was observed with the eccentric test compared with the concentric test at all follow-ups with clinically relevant differences at 4 (11.8% ± 12.7% [CI 7.8–15.8%]) and 8 months (13.4 ± 11.9 [CI 9.7–17.2%]. The eccentric NordBord test was able to identify clinically relevant deficits in knee flexor strength symmetry that were not identified by gold standard isokinetic concentric testing during the first year among patients treated with an ACL reconstruction using a hamstring tendon autograft. •The NordBord test identify significant deficits in knee flexor strength symmetry.•“Gold standard” seated concentric testing may mask semitendinosus deficits.•The NordBord test may be better at reflecting knee flexor strength recovery.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 ObjectType-Undefined-3
ISSN:	1466-853X 1873-1600 1873-1600
DOI:	10.1016/j.ptsp.2022.03.004