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Titolo:
IMPORTANCE OF THE INTERSEGMENTAL TRUNK MUSCLES FOR THE STABILITY OF THE LUMBAR SPINE - A BIOMECHANICAL STUDY IN-VITRO
Autore:
QUINT U; WILKE HJ; SHIRAZIADL A; PARNIANPOUR M; LOER F; CLAES LE;
Indirizzi:
UNIV ESSEN GESAMTHSCH,ORTHOPAED CLIN,HUFELANDSTR 55 D-45122 ESSEN GERMANY DEPT UNFALLCHIRURG FORSCH & BIOMECH ULM GERMANY ECOLE POLYTECH,DEPT MECH ENGN MONTREAL PQ H3C 3A7 CANADA OHIO STATE UNIV,DEPT IND WELDING & SYST ENGN COLUMBUS OH 43210
Titolo Testata:
Spine (Philadelphia, Pa. 1976)
fascicolo: 18, volume: 23, anno: 1998,
pagine: 1937 - 1945
SICI:
0362-2436(1998)23:18<1937:IOTITM>2.0.ZU;2-X
Fonte:
ISI
Lingua:
ENG
Soggetto:
LOW-BACK-PAIN; HEALTHY-SUBJECTS; ERECTOR SPINAE; FINITE-ELEMENT; PSOAS MAJOR; IN-VITRO; FLEXION; EXTENSION; MOVEMENTS; FORCES;
Keywords:
BIOMECHANICS; LUMBAR SPINE; RANGE OF MOTION; AGONIST AND ANTAGONIST MUSCLE FORCES SIMULATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
53
Recensione:
Indirizzi per estratti:
Citazione:
U. Quint et al., "IMPORTANCE OF THE INTERSEGMENTAL TRUNK MUSCLES FOR THE STABILITY OF THE LUMBAR SPINE - A BIOMECHANICAL STUDY IN-VITRO", Spine (Philadelphia, Pa. 1976), 23(18), 1998, pp. 1937-1945

Abstract

Study Design. A biomechanical study was performed to determine the consequences of a simulation of muscle forces on the loads imposed on the functional spinal units. Objectives. No biomechanical study has investigated the effect of incorporation of agonist and antagonist muscle forces on the loading of functional spinal units. Summary of Background Data. Spinal disorders and low back pain are increasingly becoming aworldwide problem. Traditional conservative therapies are intended tostrengthen the muscles of the trunk using a judicious regimen of physical exercises. Methods. Eighteen whole, fresh-frozen human Cadaveric lumbar spine specimens (L2-S2; average age, 53.4 years) were tested ina spine tester using pure flexion-extension, lateral bending, and axial moments. The effects of coactivation of psoas and multifidus muscles on L4-L5 mobility were simulated in vitro by applying two pairs of corresponding force vectors to L4. The segmental stability was defined by the correlation of an applied moment to the resultant deformation as shown in load-displacement curves, and the range of motion was defined as the angular deformation at maximum load. Results. The coactivation of muscles was accompanied by a 20% decrease in the range of motion(i.e., a significant increase in stability) during lateral bending and axial moments. Application of flexion-extension moments and muscle coactivation resulted in a 13% increase in the sagittal range of motion. Conclusions. The action of the intersegmental agonist and antagonistmuscles biomechanically increases the overall stiffness (stability) of the intervertebral joints in axial torque and lateral bending, whereas it may destabilize the segment in flexion.

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Documento generato il 24/09/20 alle ore 04:38:36