Achilles tendon moment arm length is smaller in children with cerebral palsy than in typically developing children

An, 1984, Determination of muscle orientations and moment arms, J. Biomech. Eng., 106, 280, 10.1115/1.3138494 Barber, 2011, Passive muscle mechanical properties of the medial gastrocnemius in young adults with spastic cerebral palsy, J. Biomech., 44, 2496, 10.1016/j.jbiomech.2011.06.008 Bar-On, 2013, A clinical measurement to quantify spasticity in children with cerebral palsy by integration of multidimensional signals, Gait Posture, 38, 141, 10.1016/j.gaitpost.2012.11.003 Bar-On, 2014, The relation between spasticity and muscle behavior during the swing phase of gait in children with cerebral palsy, Res. Dev. Disabil., 35, 3354, 10.1016/j.ridd.2014.07.053 Chow, 2003 Fath, 2010, Direct comparison of in vivo Achilles tendon moment arms obtained from ultrasound and MR scans, J. Appl. Physiol., 109, 1644, 10.1152/japplphysiol.00656.2010 Gage, 2009 2004 Ito, 2000, In vivo moment arm determination using B-mode ultrasonography, J. Biomech., 33, 215, 10.1016/S0021-9290(99)00154-2 Lance, 1980, The control of muscle tone, reflexes, and movement: Robert Wartenberg Lecture, Neurology, 30, 1303, 10.1212/WNL.30.12.1303 Lee, 2009, Tibial torsion in cerebral palsy: validity and reliability of measurement, Clin. Orthop. Relat. Res., 467, 2098, 10.1007/s11999-009-0705-1 Lee, 2009, Built for speed: musculoskeletal structure and sprinting ability, J. Exp. Biol., 212, 3700, 10.1242/jeb.031096 Lieber, 2002 Lieber, 2000, Functional and clinical significance of skeletal muscle architecture, Muscle Nerve, 23, 1647, 10.1002/1097-4598(200011)23:11<1647::AID-MUS1>3.0.CO;2-M Maganaris, 2004, Imaging-based estimates of moment arm length in intact human muscle-tendons, Eur. J. Appl. Physiol., 91, 130, 10.1007/s00421-003-1033-x Maganaris, 2000, In vivo measurement-based estimations of the human Achilles tendon moment arm, Eur. J. Appl. Physiol., 83, 363, 10.1007/s004210000247 Maganaris, 1998, Changes in Achilles tendon moment arm from rest to maximum isometric plantarflexion: in vivo observations in man, J. Physiol., 510, 977, 10.1111/j.1469-7793.1998.977bj.x Matthiasdottir, 2014, Muscle and fascicle excursion in children with cerebral palsy, Clin. Biomech., 29, 458, 10.1016/j.clinbiomech.2014.01.002 Morrell, 2002, Progressive bone and joint abnormalities of the spine and lower extremities in cerebral palsy, Radiographics, 22, 257, 10.1148/radiographics.22.2.g02mr19257 Mudge, 2014, Normative reference values for lower limb joint range, bone torsion, and alignment in children aged 4–16 years, J. Pediatr. Orthop. B, 23, 15, 10.1097/BPB.0b013e328364220a Novacheck, 2007, Orthopedic management of spasticity in cerebral palsy, Childs Nerv. Syst., 23, 1015, 10.1007/s00381-007-0378-6 O’Brien, 2009, Moment arms of the knee extensor mechanism in children and adults, J. Anat., 215, 198, 10.1111/j.1469-7580.2009.01088.x Olszewski, 2015, Achilles tendon moment arms: the importance of measuring at constant tendon load when using the tendon excursion method, J. Biomech., 48, 1206, 10.1016/j.jbiomech.2015.02.007 Orendurff, 2002, Length and force of the gastrocnemius and soleus during gait following tendo Achilles lengthenings in children with equinus, Gait Posture, 15, 130, 10.1016/S0966-6362(01)00154-0 Rasske, 2016, Variation in the human Achilles tendon moment arm during walking, Comput. Methods Biomech. Biomed. Eng. Scheys, 2008, Calculated moment-arm and muscle-tendon lengths during gait differ substantially using MR based versus rescaled generic lower-limb musculoskeletal models, Gait Posture, 28, 640, 10.1016/j.gaitpost.2008.04.010 Schless, 2015, The intra- and inter-rater reliability of an instrumented spasticity assessment in children with cerebral palsy, PLoS ONE, 10, 1, 10.1371/journal.pone.0131011 Sloot, 2015, The validity and reliability of modelled neural and tissue properties of the ankle muscles in children with cerebral palsy, Gait Posture, 42, 7, 10.1016/j.gaitpost.2015.04.006 Waugh, 2011, Can Achilles tendon moment arm be predicted from anthropometric measures in pre-pubescent children?, J. Biomech., 44, 1839, 10.1016/j.jbiomech.2011.03.023