title: Conversion of biarticular to monoarticular muscles as a component of multilevel surgery in spastic diplegia.
abstract: We treated 20 children (40 limbs) with diplegic cerebral palsy who could walk by multilevel soft tissue operative procedures including conversion of the biarticular semitendinosus and gastrocnemius to monoarticular muscles. The mean age at surgery was 11.5 years (5.6 to 17.0). All patients underwent clinical and radiological examination and three-dimensional instrumented gait analysis before and at a mean of 3.1 years (2.0 to 4.5) after surgery. The passive range of movement at the ankle, knee and hip showed improvement at follow-up. Kinematic parameters indicated a reduced pelvic range of movement and improvement of extension of the knee in single stance after operation (p < 0.0001). However, post-operative back-kneeing was detected in five of the 40 limbs. The kinetic studies showed that the power of the hamstrings and plantar flexors of the ankle was maintained while the maximum knee extensor moment during stance was reduced. The elimination of knee flexor activity of semitendinosus and gastrocnemius combined with transfer of distal rectus femoris led to an improvement in gait as confirmed by gait analysis.
authors.affiliation: Department of Orthopaedic Surgery, University of Heidelberg, Schlierbacher Landstrasse 200A, 69118 Heidelberg, Germany.
authors.forename: D
authors.initials: D
authors.lastname: Metaxiotis
authors.forename: S
authors.initials: S
authors.lastname: Wolf
authors.forename: L
authors.initials: L
authors.lastname: Doederlein
mesh_terms: D000293:Adolescent; D000843:Ankle Joint / Q000502:physiology; D002547:Cerebral Palsy / Q000503:physiopathology / Q000601:surgery*; D002648:Child; D002675:Child, Preschool; D005260:Female; D005684:Gait; D006621:Hip Joint / Q000502:physiology; D006801:Humans; D007719:Knee Joint / Q000502:physiology; D008297:Male; D009069:Movement Disorders / Q000503:physiopathology / Q000601:surgery*; D018482:Muscle, Skeletal / Q000502:physiology / Q000601:surgery*; D011182:Postoperative Care / Q000379:methods; D011446:Prospective Studies; D016059:Range of Motion, Articular