title: Semitendinosus snapping: analysis of movement, electromyographic activities, muscle strength and endurance, motor control and joint position sense.
abstract: A female ballet with a history of two-years of semi-tendinosus (ST) snapping was assessed. On physical examination snapping was observed during hyperextension of the knee. Neither any history of trauma nor treatment was recalled. Magnetic resonance imaging (MRI), movement analysis, onset timing of ST and Bisceps Femoris (BF), motor control, isokinetic muscle strength and endurance, joint position sense (JPS) were assessed. The MRI findings were normal. There were abnormal oscillations observed during hyperextension of the snapping knee compared to healthy side. There were no isokinetic muscle strength nor do muscle endurance differences. The motor control and JPS deficits were greater on the snapping knee than the healthy side. ST onset timing was earlier than BF on the snapping side. Snapping of the semitendinosus tendon has an adverse affect on JPS, motor control and onset timing of the knee muscles.
authors.affiliation: Physioterapy Department, Faculty of Health Sciences, Hacettepe University, Ankara, Turkey.
authors.forename: Hande
authors.initials: H
authors.lastname: Guney
authors.affiliation: Sports Medicine Department, Faculty of Medicine, Hacettepe University, Ankara, Turkey.
authors.forename: Defne
authors.initials: D
authors.lastname: Kaya
authors.affiliation: Orthopaedics and Traumatology Department, Faculty of Medicine, Hacettepe University, Ankara, Turkey.
authors.forename: Caglar
authors.initials: C
authors.lastname: Yilgor
authors.affiliation: School of Sports Sciences and Technology, Hacettepe Univerity, Ankara, Turkey.
authors.forename: Murat
authors.initials: M
authors.lastname: Cilli
authors.affiliation: School of Sports Sciences and Technology, Hacettepe Univerity, Ankara, Turkey.
authors.forename: Serdar
authors.initials: S
authors.lastname: Aritan
authors.affiliation: Physioterapy Department, Faculty of Health Sciences, Hacettepe University, Ankara, Turkey.
authors.forename: Inci
authors.initials: I
authors.lastname: Yuksel
authors.affiliation: Orthopaedics and Traumatology Department, Faculty of Medicine, Hacettepe University, Ankara, Turkey.
authors.forename: Mahmut Nedim
authors.initials: MN
authors.lastname: Doral
keywords: ballet dancer; joint position sense; motor control; movement analysis; snapping knee syndrome