A Conceptual Back Injury Prevention Program for Volleyball Athletes
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[ CLINICAL COMMENTARY ] CHAD E. SMITH¹@E>DDOB7D:"DPT, EdD, SCS, ATC, CSCS, FACSM²F7KB97K:?BB¹ @EI;F>8HEIAO"PT, MS, SCS3:7L?:D$C$978EHD"MD4 Dynamic Trunk Stabilization: A Conceptual Back Injury Prevention Program for Volleyball Athletes igh spinal forces during the sport of volleyball make it essential the ankle and upper leg (J78B; ').1 Low to have well-developed trunk muscle function.120 Back and back injury risk increases with spinal shoulder injuries are common to volleyball and can primarily twisting, lateral bending, and asymmetri- cal movements.3,48 be attributed to the stresses of frequent spiking and jump H The “trunk” refers to the body region serving, both activities characterized by simultaneous forceful spinal excluding the head, neck, and extremi- hyperextension and rotation, in addition to extreme shoulder external ties. The most important trunk muscle rotation (<?=KH;').15 Most acute volleyball injuries occur at the ankle function is to provide dynamic stabil- ity.83 Instability is the inability to prop- (23%) and knee (17%); however, the tion injury surveillance data for women’s erly maintain postural alignment, while back (16%) is the third most injured volleyball injuries, Agel et al1 reported stability is the capacity to resist change region.12 Most chronic volleyball that the low back ranked fourth and maintain or resume an original posi- injuries occur at the knee (33%) among body regions injured dur- tion following displacement.125 Dynamic and shoulder (20%), while the SUPPLEMENTAL ing games, following the ankle, trunk stability is the capacity to control VIDEOS ONLINE back (18%) is the next most in- knee, and shoulder. During prac- intervertebral and global trunk move- jured region.132 In a 16-year review tice, however, the low back was the ments. The dynamic stability provided by of National Collegiate Athletic Associa- third most injured region, following only the trunk also contributes to the control of distal segment movements and load- TIODEFI?I0 The sport of volleyball creates higher velocity dynamic multiplanar endurance, ing forces via coordinated trunk muscle considerable dynamic trunk stability demands. coordination, and strength-power challenges recruitment. This muscle coordination Back injury occurs all too frequently in volleyball, integrating upper and lower extremity movements, and recruitment occurs in response to particularly among female athletes. The purpose while maintaining neutral spine alignment. Phase expected or unexpected perturbations of this clinical commentary is to review functional 3 integrates volleyball-specific skill simulations such that proper posture (static stability) anatomy, muscle coactivation strategies, assess- by breaking down composite movement patterns or intended movement path (dynamic ment of trunk muscle performance, and the char- into their component parts, with differing dynamic stability) can be maintained. acteristics of effective exercises for the trunk or trunk stability requirements, while maintaining core. From this information, a conceptual progres- Several researchers have investigated Journal of Orthopaedic & Sports Physical Therapy® Downloaded from www.jospt.org at on July 6, 2017. For personal use only. No other uses without permission. Copyright © 2008 Journal of Orthopaedic & Sports Physical Therapy®. All rights reserved. sive 3-phase volleyball-specific training program is neutral spine alignment. Prospective research is the significance and interaction of vari- presented to improve dynamic trunk stability and needed to validate the efficacy of this program. ables related to energy expenditure, to potentially reduce the incidence of back injury TB;L;BE<;L?:;D9;0 Level 5. J Orthop Sports effects of posture on neutral spine align- among volleyball athletes. Phase 1 addresses Phys Ther 2008;38(11):703-720. doi:10.2519/ ment, neuromuscular control, and per- low-velocity motor control, kinesthetic awareness, jospt.2008.2814 formance factors related to back injury and endurance, with the clinician providing cues prevention. These variables are familiar to teach achievement of biomechanically neutral TA;OMEH:I0 abdominal muscles, electromyo- spine alignment. Phase 2 focuses on progressively graphy, erector spinae, kinetics, lumbar spine to physical therapists and must be con- sidered when designing injury prevention 1Medical student, School of Medicine, University of Louisville, Louisville, KY. 2Associate Professor, Division of Sports Medicine, Department of Orthopaedic Surgery, University of Louisville, Louisville, KY; Member, Medical Resource Advisory Team, USA Volleyball. 3Associate Professor, School of Physical Therapy, Lansing School of Nursing and Health Sciences, Bellarmine University, Louisville, KY. 4Professor, Division of Sports Medicine, Department of Orthopaedic Surgery, University of Louisville, Louisville, KY. Address correspondence to Dr John Nyland, Division of Sports Medicine, Department of Orthopaedic Surgery, University of Louisville, 210 East Gray St, Suite 1003, Louisville, KY. E-mail: [email protected] journal of orthopaedic & sports physical therapy | volume 38 | number 11 | november 2008 | 703 [ CLINICAL COMMENTARY ] the fishing rod is placed on the ground (base of spine) and a small load is placed on its tip (ie, top of spine), it easily bends and buckles. However, if guide wires (ie, trunk musculature) are placed along its length and if wire tension is kept con- stant, then the load the rod can success- fully support is greatly increased. Panjabi111 described spinal osseo- ligamentous, muscle, and motor control components as interdependent systems designed to achieve trunk stability. Injury <?=KH;'$The volleyball spike. or functional deficits within 1 system can be partially compensated for by contribu- tions from the other 2. The erector spinae Collegiate Women’s Volleyball Injuries or epaxial muscles make up the bulk of J78B;' 1 Sustained at Practice and Games by Body Region the dorsal lumbar musculature, consist- ing of the iliocostalis, longissimus, and spinalis (<?=KH;(). Also involved with dy- FhWYj_Y[ Games namic trunk stability are the multifidus, Total Injuries Injuries per Total Injuries Injuries per quadratus lumborum, psoas, and iliacus 8eZoH[]_ed IkijW_d[Z '&&&;nfeikh[i IkijW_d[Z '&&&;nfeikh[i Ankle 29.4% 0.83 44.1% 1.44 muscles (<?=KH; )). Abdominal muscles Knee ... ... 14.1% 0.46 involved with dynamic trunk stability in- Shoulder ... ... 5.2% 0.17 clude the rectus abdominis, internal and Back 7.9% 0.22 4.8% 0.16 external oblique, and transversus abdo- Leg 12.3% 0.35 ... ... minis (<?=KH;*). The architecture (length and fiber arrangement) and the unique morphology of each muscle determines conditioning and rehabilitation programs. of this clinical commentary is to review its function.39,51 Less energy is needed to restore neutral relevant functional anatomy, muscle co- Back neuromuscular fatigue, inflam- spine alignment following perturbation activation strategies, assessment of trunk mation, deconditioning, and pain are than is needed to correct asymmetrical, muscle performance, and the character- related to regional and lower extrem- kyphotic, or lordotic postures.64,128 Barr et istics of effective trunk muscle exercises. ity neuromuscular dysfunction and atro- al19 have reported that repetitious move- From this information a conceptual train- phy.10,67,83,126,141,142 Maladaptive transversus ments that are altered by poor strength, ing program is presented that is designed abdominis and multifidus motor control flexibility, fatigue, posture, or abnormal to increase dynamic trunk stability and may also be related to altered posture, neuromuscular control may promote decrease back injury incidence among muscle imbalance, and sedentary life- tissue damage. Others have shown the volleyball athletes. styles. O’Sullivan et al110 reported that importance of trunk muscle coactiva- low back pain induced trunk muscle dys- tion in providing stiffness and dynamic <KD9J?ED7BJHKDA7D7JECO function has a greater negative effect on Journal of Orthopaedic & Sports Physical Therapy® Downloaded from www.jospt.org at on July 6, 2017. For personal use only. No other uses without permission. Copyright © 2008 Journal of Orthopaedic & Sports Physical Therapy®. All rights reserved. trunk stability to protect the spine from coactivation and recruitment patterns injury.59,62 This dynamic stability controls ntagonistic trunk muscle co- than on strength. Deconditioned trunk excessive or poorly controlled trunk mo- activation is largely influenced by muscles have a reduced capacity to with- tion following perturbation14,29,31,32,142 and Adynamic trunk stability needs.61 Us- stand perturbation and repetitive loads, attenuates the sudden forces that contrib- ing models and calculations from Euler, causing strain on lumbar annular disc fi- ute to low back48,60 and lower extremity Crisco and Panjabi37,38 reported that com- bers and potentially increasing back pain. pain and injury.28,70,141,142 pressive loading of 90 N caused spinal Individuals who experience low back pain Volleyball players are at risk for sus- buckling when muscular contributions often have trunk muscle dysfunction, taining both acute and chronic back in- were absent. McGill97,100 made the anal- particularly of the multifidii.71-73,76,77 jury.12,132 Having effective dynamic trunk ogy that the spine and the trunk muscles The gluteal muscles and the trunk and stability is vital to both back injury pre- function together like a fishing rod and lower extremity fascial systems