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Arumugam, A., Markström, J. & Häger, C. (2020). A novel test reliably captures hip and knee kinematics and kinetics during unanticipated/anticipated diagonal hops in individuals with anterior cruciate ligament reconstruction. Journal of Biomechanics, 99, Article ID 109480.
Open this publication in new window or tab >>A novel test reliably captures hip and knee kinematics and kinetics during unanticipated/anticipated diagonal hops in individuals with anterior cruciate ligament reconstruction
2020 (English)In: Journal of Biomechanics, ISSN 0021-9290, E-ISSN 1873-2380, Vol. 99, article id 109480Article in journal (Refereed) Published
Abstract [en]

Unanticipated land-and-cut maneuvers might emulate lower limb mechanics associated with anterior cruciate ligament (ACL) injury. Reliability studies on landing mechanics of such maneuvers are however lacking. This study investigated feasibility and within-session reliability of landing mechanics of a novel one-leg double-hop test, mimicking a land-and-cut maneuver, in individuals with ACL reconstruction (ACLR). Our test comprised a forward hop followed by a diagonal hop in either of two directions (medial/lateral) under anticipated and unanticipated conditions. Twenty individuals with a unilateral ACLR (aged 24.2 ± 4.2 years, 0.7-10.8 years post-surgery) performed three successful hops/direction per leg. We determined reliability (intraclass correlation coefficient [ICC]) and agreement (standard error of measurement [SEM]) of 3-dimensional hip and knee angles and moments during the deceleration phase of the land-and-cut maneuver (vulnerable for non-contact ACL injuries). Mean success rate for unanticipated hops was 71-77% and for anticipated hops 91-95%. Both limbs demonstrated moderate-excellent reliability (ICC 95% confidence intervals: 0.50-0.99) for almost all hip and knee peak angles and moments in all planes and conditions, with a few exceptions: poor-good reliability for hip and knee frontal and/or transverse plane variables, especially for lateral diagonal hops. The SEMs were ≤5° and ≤0.23 N·m/kg·m for most peak angles and moments, respectively. Our test seems feasible and showed satisfactory reliability for most hip and knee angles and moments; however, low knee abduction and internal rotation angles and moments, and moderate reliability of these moments deserve consideration. The test appears to challenge dynamic knee control and may prove valuable in evaluation during knee rehabilitation.

Place, publisher, year, edition, pages
Elsevier, 2020
Keywords
Biomechanics, Feasibility, Injury, Kinematics, Kinetics, Sport
National Category
Physiotherapy
Research subject
biomechanics
Identifiers
urn:nbn:se:umu:diva-165259 (URN)10.1016/j.jbiomech.2019.109480 (DOI)000513294600009 ()31727373 (PubMedID)
Available from: 2019-11-18 Created: 2019-11-18 Last updated: 2020-03-10Bibliographically approved
Markström, J., Grip, H., Schelin, L. & Häger, C. (2020). Individuals With an Anterior Cruciate Ligament-Reconstructed Knee Display Atypical Whole Body Movement Strategies but Normal Knee Robustness During Side-Hop Landings: A Finite Helical Axis Analysis. American Journal of Sports Medicine, 48(5), 1117-1126
Open this publication in new window or tab >>Individuals With an Anterior Cruciate Ligament-Reconstructed Knee Display Atypical Whole Body Movement Strategies but Normal Knee Robustness During Side-Hop Landings: A Finite Helical Axis Analysis
2020 (English)In: American Journal of Sports Medicine, ISSN 0363-5465, E-ISSN 1552-3365, Vol. 48, no 5, p. 1117-1126Article in journal (Refereed) Published
Abstract [en]

BACKGROUND: Atypical knee joint biomechanics after anterior cruciate ligament reconstruction (ACLR) are common. It is, however, unclear whether knee robustness (ability to tolerate perturbation and maintain joint configuration) and whole body movement strategies are compromised after ACLR.

PURPOSE: To investigate landing control after ACLR with regard to dynamic knee robustness and whole body movement strategies during sports-mimicking side hops, and to evaluate functional performance of hop tests and knee strength.

STUDY DESIGN: Controlled laboratory study.

METHODS: An 8-camera motion capture system and 2 synchronized force plates were used to calculate joint angles and moments during standardized rebound side-hop landings performed by 32 individuals with an ACL-reconstructed knee (ACLR group; median, 16.0 months after reconstruction with hamstring tendon graft [interquartile range, 35.2 months]) and 32 matched asymptomatic controls (CTRL). Dynamic knee robustness was quantified using a finite helical axis approach, providing discrete values quantifying divergence of knee joint movements from flexion-extension (higher relative frontal and/or transverse plane motion equaled lower robustness) during momentary helical rotation intervals of 10°. Multivariate analyses of movement strategies included trunk, hip, and knee angles at initial contact and during landing and hip and knee peak moments during landing, comparing ACLR and CTRL, as well as legs within groups.

RESULTS: Knee robustness was lower for the first 10° motion interval after initial contact and then successively stabilized for both groups and legs. When landing with the injured leg, the ACLR group, as compared with the contralateral leg and/or CTRL, demonstrated significantly greater flexion of the trunk, hip, and knee; greater hip flexion moment; less knee flexion moment; and smaller angle but greater moment of knee internal rotation. The ACLR group also had lower but acceptable hop and strength performances (ratios to noninjured leg >90%) except for knee flexion strength (12% deficit).

CONCLUSION: Knee robustness was not affected by ACLR during side-hop landings, but alterations in movement strategies were seen for the trunk, hip, and knee, as well as long-term deficits in knee flexion strength.

CLINICAL RELEVANCE: Knee robustness is lowest immediately after landing for both the ACLR group and the CTRL and should be targeted in training to reduce knee injury risk. Assessment of movement strategies during side-hop landings after ACLR should consider a whole body approach.

Place, publisher, year, edition, pages
Sage Publications, 2020
Keywords
biomechanics, kinematics, kinetics, helical axis
National Category
Physiotherapy Orthopaedics
Identifiers
urn:nbn:se:umu:diva-169219 (URN)10.1177/0363546520910428 (DOI)000523044300009 ()32168459 (PubMedID)
Funder
Swedish Research Council, K2014Swedish Research Council, 2016-02763Västerbotten County Council, ALFVLL7002689Swedish National Centre for Research in Sports, CIF 2015/11 P2016-0042
Note

Följande två forskningsfinansiärer fanns inte bland de valbara och gick därför inte att lägga till:

1. Young Researcher Awardee to C.K.H. (Dnr 223-514-09) (dvs. karriärbidrag, Umeå universitet)

2. Umeå University School of Sport Science (Dnr IH 5.3-13 2015)

Available from: 2020-03-31 Created: 2020-03-31 Last updated: 2020-05-27Bibliographically approved
Markström, J., Grip, H., Schelin, L. & Häger, C. K. (2019). Dynamic knee control and movement strategies in athletes and non‐athletes in side hops: implications for knee injury. Scandinavian Journal of Medicine and Science in Sports, 29(8), 1181-1189
Open this publication in new window or tab >>Dynamic knee control and movement strategies in athletes and non‐athletes in side hops: implications for knee injury
2019 (English)In: Scandinavian Journal of Medicine and Science in Sports, ISSN 0905-7188, E-ISSN 1600-0838, Vol. 29, no 8, p. 1181-1189Article in journal (Refereed) Published
Abstract [en]

Athletes exposed to rapid maneuvers need a high level of dynamic knee stability and robustness, while also controlling whole body movement, to decrease the risk of non‐contact knee injury. The effects of high‐level athletic training on such measures of movement control have not, however, been thoroughly evaluated. This study investigated whether elite athletes (who regularly perform knee‐specific neuromuscular training) show greater dynamic knee robustness and/or different movement strategies than non‐athletic controls, in relation to overall knee function. Thirty‐nine women (19 athletes, 20 controls) performed standardized rebound side hops (SRSH) while a motion capture system synchronized with two force plates registered three‐dimensional trunk, hip, and knee joint angles and moments. Dynamic knee robustness was evaluated using finite helical axis (FHA) inclination angles extracted from knee rotation intervals of 10°, analyzed with independent t tests. Angle and moment curves were analyzed with inferential methods for functional data. Athletes had superior knee function (less laxity, greater hop performances, and strength) but presented similar FHA inclination angles to controls. Movement strategies during the landing phase differed; athletes presented larger (a) hip flexion angles (during 9%‐29% of the phase), (b) hip adduction moments (59%‐99%), (c) hip internal rotation moments (83%‐89%), and (d) knee flexion moments (79%‐93%). Thus, elite athletes may have a greater ability than non‐athletes to keep the knee robust while performing SRSH more efficiently through increased engagement of the hip. However, dynamic knee robustness associated with lower FHA inclination angles still show room for improvement, thus possibly decreasing knee injury risk.

Place, publisher, year, edition, pages
John Wiley & Sons, 2019
Keywords
biomechanics, injury prevention, kinematics, kinetics, sports
National Category
Physiotherapy
Research subject
physiotherapy
Identifiers
urn:nbn:se:umu:diva-159135 (URN)10.1111/sms.13432 (DOI)000475431400013 ()30972848 (PubMedID)2-s2.0-85068897729 (Scopus ID)
Available from: 2019-05-20 Created: 2019-05-20 Last updated: 2019-08-12Bibliographically approved
Arumugam, A., Markström, J. L. & Häger, C. K. (2019). Introducing a novel test with unanticipated medial/lateral diagonal hops that reliably captures hip and knee kinematics in healthy women. Journal of Biomechanics, 82, 70-79
Open this publication in new window or tab >>Introducing a novel test with unanticipated medial/lateral diagonal hops that reliably captures hip and knee kinematics in healthy women
2019 (English)In: Journal of Biomechanics, ISSN 0021-9290, E-ISSN 1873-2380, Vol. 82, p. 70-79Article in journal (Refereed) Published
Abstract [en]

Despite a vast literature on one-leg hops and cutting maneuvers assessing knee control pre/post-injury of the anterior cruciate ligament (ACL), comprehensive and reliable tests performed under unpredictable conditions are lacking. This study aimed to: (1) assess the feasibility of an innovative, knee-challenging, one-leg double-hop test consisting of a forward hop followed by a diagonal hop (45°) performed medially (UMDH) or laterally (ULDH) in an unanticipated manner; and (2) determine within- and between-session reliability for 3-dimensional hip and knee kinematics and kinetics of these tests. Twenty-two healthy women (22.3 ± 3.3 years) performed three successful UMDH and ULDH, twice 1–4 weeks apart. Hop success rate was 69–84%. Peak hip and knee angles demonstrated moderate to excellent within-session reliability (intraclass correlation coefficient [ICC] 95% confidence interval [CI]: 0.67–0.99, standard error of measurement [SEM] ≤  3°) and poor to excellent between-session reliability (ICC CI: 0.22–0.94, SEM ≤ 3°) for UMDH and ULDH. The smallest real difference (SRD) was low (≤ 5°) for nearly all peak angles. Peak hip and knee moments demonstrated poor to excellent reliability (ICC CI: 0–0.97) and, in general, moments were more reliable within-session (SEM ≤ 0.14 N.m/kg.m, both directions) than between-session (SRD ≤ 0.43 N.m/kg.m). Our novel test was feasible and, in most but not all cases, provided reliable angle estimates (within-session > between-session, both directions) albeit less reliable moments (within-session > between-session, both directions). The relatively large hip and knee movements in the frontal and transverse planes during the unanticipated hops suggest substantial challenge of dynamic knee control. Thus, the test seems appropriate for evaluating knee function during ACL injury rehabilitation.

Place, publisher, year, edition, pages
Elsevier, 2019
Keywords
Motion analysis, Biomechanics, Anterior cruciate ligament, Sports, Rehabilitation
National Category
Physiotherapy
Research subject
physiotherapy
Identifiers
urn:nbn:se:umu:diva-152959 (URN)10.1016/j.jbiomech.2018.10.015 (DOI)000456353700008 ()30392773 (PubMedID)
Available from: 2018-10-31 Created: 2018-10-31 Last updated: 2019-02-26Bibliographically approved
Markström, J. L. (2019). Movement strategies and dynamic knee control after anterior cruciate ligament injury: a three-dimensional biomechanical analysis. (Doctoral dissertation). Umeå University
Open this publication in new window or tab >>Movement strategies and dynamic knee control after anterior cruciate ligament injury: a three-dimensional biomechanical analysis
2019 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Background: Rupture of the anterior cruciate ligament (ACL) is common and mainly occurs in non-contact situations in sports, often due to momentarily poor movement control. Assessment of movement quality during sport-like tasks iscrucial to understand how to decrease the high risk of reinjury for ACL-injured persons, but also how to prevent primary injury. This thesis addresses movement quality after ACL injury and includes development and evaluation of a novel standardized rebound side hop test (SRSH) for reliability and agreement of landing mechanics, and compares these outcomes between asymptomatic persons with different athletic levels, and between different hop tests.

Methods: This thesis involves five papers based on two separate data collections performed in a motion analysis laboratory. Paper I is a long-term follow up of ACL-injured persons treated with or without ACL reconstruction (ACLR) compared to asymptomatic persons (total N = 99, age 35-63), while papers II-V included ACLR persons, and asymptomatic elite athletes and non-athletes (total N = 79, age 17-34). A motion capture system synchronized with force plates and surface electromyography (EMG) registered trunk, hip and knee angles and moments and knee muscle activity during the hop for distance, vertical hop, and SRSH. Novel measures of dynamic knee robustness were also evaluated using finite helical axis inclination angles extracted from knee rotation intervals of 10˚.

Results: On average 23 years after injury, ACL injured persons performed the vertical hop with diverse angles compared to controls and their non-injured leg.The younger groups of ACLR persons and controls generally displayed excellent reliability and agreement for SRSH landing mechanics. These outcomes differed between the groups, and between legs for ACLR persons, despite similar dynamic knee robustness and acceptable knee function outcomes. Curve analyses further displayed differences between athletes and non-athletes, mainly with greater hip moments for athletes, although with similar values for dynamic knee robustness. Finally, greater knee angles and moments considered strenuous for the ACL were evident during the first rebound landing in SRSH compared to the other landings.

Conclusions: Persons who have suffered an ACL injury, regardless of whether treated with ACLR or not, appear to use task-coping strategies in preparation for and during landings to decrease knee joint loading, probably to preserve dynamic knee robustness. More attention should be given to the trunk and hip in clinics when evaluating movement quality after ACL injury to reduce the risk of future injuries due to movement compensation. High-level athletic training may also improve the ability to maintain dynamic knee robustness whilst performing a sport-like side-to-side task more efficiently through increased engagement of the hip. Finally, side hop landings should be assessed when evaluating and correcting for erroneous landing mechanics to improve knee landing control.

Abstract [sv]

Bakgrund: Främre korsbandsskada (ACL-skada) är en vanlig idrottsskada som huvudsakligen uppstår i situationer utan kontakt med annan spelare till följd aven tillfälligt dålig rörelsekontroll. Utvärdering av rörelsekvalitet under idrottsliknande tester behövs för att bättre förstå hur risken för ACL-skador och återskador kan minskas. Denna avhandling är inriktad på rörelsekvalitet efter ACL-skada och behandlar utveckling samt utvärdering av ett nytt standardiserat sidohopp (SRSH). Tillförlitlighet och överensstämmelse av ledvinklar och moment utvärderas och jämförs mellan personer med och utan ACL-skada, mellan personer med olika atletbakgrund, samt mellan olika hopptester.

Metoder: Denna avhandling omfattar fem studier, vilka är baserade på två separata datasamlingar utförda i ett rörelsesanalyslaboratorium. Studie I är en långtidsuppföljning av personer med ACL-skada behandlade både med och utan ACL-rekonstruktion, vilka jämförs med knäfriska kontroller (totala N = 99, 35-63 år). Studie II-V inkluderade personer med ACL-rekonstruktion, knäfriska kontroller och elitatleter (totala N = 79, 17-34 år). Ett rörelseanalyssystem synkroniserat med kraftplattor och ytelektromyografi registrerade bål, höft och knävinklar och moment, samt lårmuskelaktivitet under enbenshopp (på längden, på höjden, samt SRSH). Även nya utfallsmått som utvärderar knäets robusthet under rörelse analyserades med helixvinklar från intervaller av knärörelse på 10˚.

Resultat: I genomsnitt 23 år efter ACL-skada utförde båda grupperna ett enbenshopp på höjden med olika ledvinklar, både jämfört med kontroller samt deras oskadade ben. De yngre ACL-skadade personerna och kontrollerna visade generellt utmärkt tillförlitlighet och överensstämmelse av ledvinklar och moment under SRSH. Dessa utfallsmått skiljde sig mellan grupperna och mellan benen för ACL-skadade personer, trots att lika resultat av knäets robusthet samt acceptabla knäfunktionsresultat visades. Kurvanalyser visade även på skillnader mellan atleter och icke-atleter, främst med större höftmoment för atleter, trots lika resultat av knäets robusthet. Den första landningen i SRSH visade större knävinklar och moment som anses belasta ACL jämfört med övriga landningar.

Slutsatser: Personer med ACL-skada, oavsett om de behandlats med ACLrekonstruktion eller ej, verkar tillämpa rörelsestrategier för att hantera landningar från enbenshopp genom att minska belastningen på knäleden, troligen för att bevara knäets robusthet. I klinik bör ett större fokus läggas på bål och höftrörelser vid utvärdering av rörelsekvaliteten efter ACL-skada. Detta för att minska risken för framtida skador på grund av rörelsekompensation. Vidare förbättrar idrottsträning på hög nivå troligen förmågan att upprätthålla knäets robusthet samtidigt som utförandet av sidohoppstester blir effektivare genom ett ökat engagemang av höften. Slutligen bör sidhoppslandningar användas vid utvärdering och korrigering av landningsmekanik för en förbättrad knäkontroll.

Place, publisher, year, edition, pages
Umeå University, 2019. p. 88
Series
Umeå University medical dissertations, ISSN 0346-6612 ; 2040
Keywords
Anterior cruciate ligament, biomechanics, kinematics, kinetics, finite helical axis, injury prevention, sports, reliability, agreement, one-leg hops, functional data analysis
National Category
Physiotherapy
Research subject
physiotherapy
Identifiers
urn:nbn:se:umu:diva-159136 (URN)978-91-7855-066-1 (ISBN)
Public defence
2019-06-14, Aulan, Vårdvetarhuset, Umeå, 09:00 (English)
Opponent
Supervisors
Available from: 2019-05-24 Created: 2019-05-20 Last updated: 2019-05-21Bibliographically approved
Pini, A., Markström, J. & Schelin, L. (2019). Test-retest reliability measures for curve data: an overview with recommendations and supplementary code.. Sports Biomechanics, 1-22
Open this publication in new window or tab >>Test-retest reliability measures for curve data: an overview with recommendations and supplementary code.
2019 (English)In: Sports Biomechanics, ISSN 1476-3141, E-ISSN 1752-6116, p. 1-22Article in journal (Refereed) Epub ahead of print
Abstract [en]

The purpose of this paper is to provide an overview of available methods for reliability investigations when the outcome of interest is a curve. Curve data, or functional data, is commonly collected in biomechanical research in order to better understand different aspects of human movement. Using recent statistical developments, curve data can be analysed in its most detailed form, as functions. However, an overview of appropriate statistical methods for assessing reliability of curve data is lacking. A review of contemporary literature of reliability measures for curve data within the fields of biomechanics and statistics identified the following methods: coefficient of multiple correlation, functional limits of agreement, measures of distance and similarity, and integrated pointwise indices (an extension of univariate reliability measures to curve data, inclusive of Pearson correlation, intraclass correlation, and standard error of measurement). These methods are briefly presented, implemented (R-code available as supplementary material) and evaluated on simulated data to highlight advantages and disadvantages of the methods. Among the identified methods, the integrated intraclass correlation and standard error of measurement are recommended. These methods are straightforward to implement, enable results over the domain, and consider variation between individuals, which the other methods partly neglect.

Keywords
Agreement, functional data, kinematics, similarity
National Category
Probability Theory and Statistics Physiotherapy
Identifiers
urn:nbn:se:umu:diva-163944 (URN)10.1080/14763141.2019.1655089 (DOI)000488683100001 ()31578129 (PubMedID)
Funder
Swedish Research Council, 2016-02763
Available from: 2019-10-09 Created: 2019-10-09 Last updated: 2019-10-24
Markström, J. L., Schelin, L. & Häger, C. K. (2018). A novel standardised side hop test reliably evaluates landing mechanics for anterior cruciate ligament reconstructed persons and controls. Sports Biomechanics
Open this publication in new window or tab >>A novel standardised side hop test reliably evaluates landing mechanics for anterior cruciate ligament reconstructed persons and controls
2018 (English)In: Sports Biomechanics, ISSN 1476-3141, E-ISSN 1752-6116Article in journal (Refereed) Epub ahead of print
Abstract [en]

We propose a novel one-leg standardised rebound side-hop test (SRSH) specifically designed for detailed analysis of landing mechanics. Anterior cruciate ligament reconstructed persons (ACLR, n = 30) and healthy-knee controls (CTRL, n = 30) were tested for within-session and test-retest (CTRL only, n = 25) reliability and agreement. Trunk, hip and knee angles and moments in sagittal, frontal, and transversal planes during landing, including time to stabilisation (TTS), were evaluated using intra-class correlations (ICCs), average within-person standard deviations (SW) and minimal differences. Excellent within-session reliability were found for angles in both groups (most ICCs > 0.90, SW ≤ 5°), and excellent to good for moments (most ICCs > 0.80, SW ≤ 0.34 Nm/kg). Only knee internal rotation moment showed poor reliability (ICC < 0.4). Test-retest results were excellent to fair for all angles and moments (ICCs 0.47–0.91, SW < 5° and ≤ 0.25 Nm/kg), except for peak trunk lateral bending angle and knee internal rotation moment. TTS showed excellent to fair within-session reliability but poor test-retest results. These results, with a few exceptions, suggest promising potential of evaluating landing mechanics during the SRSH for ACLR and CTRL, and emphasise the importance of joint-specific movement control variables in standardised tasks.

Place, publisher, year, edition, pages
Routledge, 2018
Keywords
reliability, agreement, sports, kinematics, kinetics
National Category
Physiotherapy
Research subject
physiotherapy
Identifiers
urn:nbn:se:umu:diva-152960 (URN)10.1080/14763141.2018.1538385 (DOI)
Available from: 2018-10-31 Created: 2018-10-31 Last updated: 2020-01-07
Markström, J. L., Tengman, E. & Häger, C. (2018). ACL-reconstructed and ACL-deficient individuals show differentiated trunk, hip, and knee kinematics during vertical hops more than 20 years post-injury. Knee Surgery, Sports Traumatology, Arthroscopy, 26(2), 358-367
Open this publication in new window or tab >>ACL-reconstructed and ACL-deficient individuals show differentiated trunk, hip, and knee kinematics during vertical hops more than 20 years post-injury
2018 (English)In: Knee Surgery, Sports Traumatology, Arthroscopy, ISSN 0942-2056, E-ISSN 1433-7347, Vol. 26, no 2, p. 358-367Article in journal (Refereed) Published
Abstract [en]

PURPOSE: Little is known regarding movement strategies in the long term following injury of the anterior cruciate ligament (ACL), and even less about comparisons of reconstructed and deficient knees in relation to healthy controls. The present purpose was to compare trunk, hip, and knee kinematics during a one-leg vertical hop (VH) ~20 years post-ACL injury between persons treated with surgery and physiotherapy (ACLR), solely physiotherapy (ACLPT), and controls (CTRL). Between-leg kinematic differences within groups were also investigated.

METHODS: Sixty-six persons who suffered unilateral ACL injury on average 23 ± 2 years ago (32 ACLR, 34 ACLPT) and 33 controls performed the VH. Peak trunk, hip, and knee angles during Take-off and Landing phases recorded with a 3D motion capture system were analysed with multivariate statistics.

RESULTS: Significant group effects during both Take-off and Landing were found, with ACLPT differing from CTRL in Take-off with a combination of less knee flexion and knee internal rotation, and from both ACLR and CTRL in Landing with less hip and knee flexion, knee internal rotation, and greater hip adduction. ACLR also presented different kinematics to ACLPT and CTRL in Take-off with a combination of greater trunk flexion, hip flexion, hip internal rotation, and less knee abduction, and in Landing with greater trunk flexion and hip internal rotation. Further, different kinematics and hop height were found between legs within groups in both Take-off and Landing for both ACL groups, but not for CTRL.

CONCLUSION: Different kinematics for the injured leg for both ACL groups compared to CTRL and between treatment groups, as well as between legs within treatment groups, indicate long-term consequences of injury. Compensatory mechanisms for knee protection seem to prevail over time irrespective of initial treatment, possibly increasing the risk of re-injury and triggering the development of osteoarthritis. Detailed investigation of movement strategies during the VH provides important information and a more comprehensive evaluation of knee function than merely hop height. More attention should also be given to the trunk and hip in clinics when evaluating movement strategies after ACL injury.

LEVEL OF EVIDENCE: Prospective cohort study, Level II.

Keywords
Anterior cruciate ligament, Long-term, Movement strategy, One-leg vertical hop, Treatment
National Category
Physiotherapy
Research subject
physiotherapy
Identifiers
urn:nbn:se:umu:diva-144713 (URN)10.1007/s00167-017-4528-4 (DOI)000424056400002 ()28337590 (PubMedID)
Available from: 2018-02-12 Created: 2018-02-12 Last updated: 2019-05-20Bibliographically approved
Markström, J., Tengman, E. & Häger, C. (2018). Different dynamic knee stability and frontal plane kinematics and kinetics between landings in common one-leg hops for ACL-reconstructed women and knee-healthy controls. In: 8th World Congress of Biomechanics, Dublin, July 8-12, 2018: . Paper presented at 8th World Congress of Biomechanics, Dublin, July 8-12, 2018.
Open this publication in new window or tab >>Different dynamic knee stability and frontal plane kinematics and kinetics between landings in common one-leg hops for ACL-reconstructed women and knee-healthy controls
2018 (English)In: 8th World Congress of Biomechanics, Dublin, July 8-12, 2018, 2018Conference paper, Poster (with or without abstract) (Other academic)
National Category
Physiotherapy
Identifiers
urn:nbn:se:umu:diva-150559 (URN)
Conference
8th World Congress of Biomechanics, Dublin, July 8-12, 2018
Available from: 2018-08-13 Created: 2018-08-13 Last updated: 2020-03-03Bibliographically approved
Markström, J., Grip, H., Schelin, L. & Häger, C. (2018). Elite women athletes with superior knee function present similar dynamic knee stability, although different movement strategies, when compared to controls. In: Murphy, M.H., Boreham, C.A.G., De Vito, G., Tsolakidis, E. (Ed.), 23rd annual Congress of the European College of Sport Science: Sport Science at the cutting edge, Dublin, Ireland, July 4-7, 2018: Book of Abstracts. Paper presented at 23rd Annual Congress of the European College of Sport Science (ECSS), Dublin, Ireland, July 4-7, 2018 (pp. 555-555). European College of Sport Sciences
Open this publication in new window or tab >>Elite women athletes with superior knee function present similar dynamic knee stability, although different movement strategies, when compared to controls
2018 (English)In: 23rd annual Congress of the European College of Sport Science: Sport Science at the cutting edge, Dublin, Ireland, July 4-7, 2018: Book of Abstracts / [ed] Murphy, M.H., Boreham, C.A.G., De Vito, G., Tsolakidis, E., European College of Sport Sciences , 2018, p. 555-555Conference paper, Oral presentation with published abstract (Refereed)
Abstract [en]

INTRODUCTION: Neuromuscular training (NMT) of the lower limb is vital for athletes in learning correct movement technique to avoid risk of injury to the anterior cruciate ligament (ACL). The NMT aims for improved knee control while maintaining dynamic knee stability (DKS; resistance to linear/angular accelerations) during knee-challenging tasks. Assessing DKS is commonly attempted by evaluating discrete values of kinematic and kinetic variables during one-leg hops, but these measures may not sufficiently capture knee dynamics. We aimed to evaluate if elite women athletes who regularly perform NMT have greater DKS and/or different landing technique than normally active women who do not perform NMT, and if there are any correlations of DKS to peak knee extensor or flexor strength.

METHODS: A motion capture system (Qualisys) synchronized with two force plates (Kistler) registered hip and knee 3D joint angles and moments during one-leg standardized lateral side hop landings for 39 women (19 athletes, 20 controls). Ten trials were performed for the dominant leg with hands behind their back holding a rope (25 cm), deemed successful following 3 s of single leg stance after landing without putting the contralateral foot on the ground or making major adjustments with the ipsilateral foot. DKS was evaluated using the inclination angle of the knee’s helical axis relative to the flexion-extension axis calculated for rotation intervals of 10 degrees, as has been proven useful (Grip and Häger, 2013), to quantify how much knee joint motion deviated from pure flexion-extension at landing. Hip and knee joint angles were analysed at initial contact (IC), and peak angles and peak moments were analysed during the deceleration phase of landing from IC to peak knee flexion (ind. t-tests, p < 0.05).

RESULTS: Athletes had more successful hops, faster task execution, greater knee extension strength, greater hip flexion angle at IC, and higher peak moments of hip adduction and knee flexion than controls. There were however, no group differences in DKS or any significant correlations between DKS and knee extensor or flexor strength for any of the groups (r < absolute values of 0.41).

CONCLUSION: Elite women athletes that perform NMT on a regular basis had superior knee function but similar DKS to controls when performing a sport-specific one-leg side hop maneuver. The greater hip flexion at IC for athletes shows a different movement strategy for landing preparation. Potential benefits of NMT in sports contexts, e.g. less ACL injuries (Sugimoto et al., 2016), may be due to movement alterations of the hip to increase landing control to avoid positions that strain the ACL rather than improving DKS. Further emphasis on knee-specific landing control may be important to also improve DKS, which seems unrelated to strength.

Place, publisher, year, edition, pages
European College of Sport Sciences, 2018
National Category
Physiotherapy
Identifiers
urn:nbn:se:umu:diva-150557 (URN)978-3-9818414-1-1 (ISBN)
Conference
23rd Annual Congress of the European College of Sport Science (ECSS), Dublin, Ireland, July 4-7, 2018
Available from: 2018-08-13 Created: 2018-08-13 Last updated: 2020-03-04Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-6339-9544

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