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5th Interdisciplinary World Congress on Low Back & Pelvic Pain
Melbourne, November 2004 www.worldcongresslbp.com
ACTIVE CONTRACTION OF THE THORACOLUMBAR
FASCIA - INDICATIONS OF A NEW FACTOR IN LOW
BACK PAIN RESEARCH WITH IMPLICATIONS FOR
MANUAL THERAPY
Robert Schleip, Werner Klingler MD, Frank Lehmann-Horn PhD
Applied Physiology, Ulm University, Germany
Email: robert.schleip@medizin.uni-ulm.de
INTRODUCTION
The fascia and ligaments are usually considered to be a passive element in the neuro-myofascial
dynamics of joint stability. The presence of contractile connective tissue cells and the ability of
fascia to contract on its own suggests that fascia may play a more active role in joint dynamics and
regulation.
BACKGROUND AND PURPOSE
Tensile transmission across the thoracolumbar fascia (TLF) serves as an important element for
back stability(1). Previous viscoelastic examinations of the TLF exposed to in vitro isometric
stretch demonstrated an unexpected ability for autonomous fascial contraction within several
minutes (2). Since the musculature of visceral organs exhibits a similar capacity, a histological
examination of the TLF for intrafascial cells with smooth muscle like contractility had been
suggested (2,3). Contractile cells containing smooth muscle actin have been found not only in
wound healing and pathologically contracted fascia (Morbus Dupuytren, club foot, frozen
shoulder) but also in normal ligaments (4,5), tendons (6) and fascia (7,3). The current study
therefore examines the existence of cells containing contractile smooth muscle actin in the TLF.
Additionally some of the possible variables influencing TLF active contraction are investigated.
Figure1. Left side: tissue section of lumbar fascia from a man of 19 yrs with dense population of
cells staining positively for alpha smooth muscle actin (here in black) and with high degree of
collagen crimp. Right side: section from man of 76 yrs. with hardly any collagen crimping and no
positively stained cells in this area.
5th Interdisciplinary World Congress on Low Back & Pelvic Pain
Melbourne, November 2004 www.worldcongresslbp.com
MATERIAL AND METHODS
Immunohistochemistry: 39 tissue samples of the superficial lamina of the posterior layer of the
TLF at the level of L2 and L4 from 11 human cadavers of 3 different age groups were taken
(Group A: 19-26 yrs, 4 males. Group B: 54-56 yrs, 1 female, 2 male. Group C: 71-76 yrs, 1
female, 3 male). Samples were analyzed by immunohistochemistry for cells containing alpha
smooth muscle actin using a monoclonal antibody,
In vitro contraction tests: Test pieces of fresh porcine lumbar fascia (size 30 mm x 2 mm x 2 mm)
were dissected along the main longitudinal fiber direction. The samples were fixed at either end
and oriented vertically in an organ bath containing Krebs-Ringer solution (pH buffered, supplied
with 95% O2 and 5% CO2) at 35o C. Samples were prestretched with a constant 5% isometric
strain. Force registrations were performed after an adaptation period of at least 30 minutes to
ensure steady state conditions. The tension force of the tissue was recorded by a computer over a
testing period of 15 min., during which the tissue was either challenged with electrical stimulation
or with chemical stressors, thereby testing for a possible response to acetylcholine, caffeine, the
NO-donator glyceroltrinitrate, and a potassium enriched solution.
RESULTS
Immunohistochemistry: Cells containing alpha smooth muscle actin were found in all tissue
samples. Mean density of these cells in longitudinal sections was 128/mm2 (± 51/mm2) in group A
(<32 yrs), 13/mm2 (±8/mm2) in group B (54-56 yrs) and 12/mm2 (± 3/mm2) in group C (<70 yrs).
Mean average density of contractile cells was 79/mm2, with an average cellular diameter of 4.2 µm
and a length of 18.1 µm. Density seemed to be related to the degree of collagen crimping, which
had a mean amplitude of 8 µm (± 1.5µm) in the youngest group, 4.4 µm (± 0.7µm) in the middle
group, and 3.9 µm (± 0.6µm) in the eldest group. The youngest group showed significantly more
contractile cells (p<0.002) and higher crimp amplitude (p>0.0005) compared with any of the two
other groups.
In vitro contraction tests: Caffeine in concentrations up to 50 mM did not result in reproducible
significant tension increase or decrease, neither did acetylcholine (10-8 to 10-6 M) or a potassium
enriched solution of up to 80 mM. Yet electrical stimulation of 5 Hz (7 V, 2 ms) tends to increase
the force (mean increase 2.1%, ± 1.7%, n=12), a 20 Hz stimulation (7V, 2 ms) tends to decrease it
(by 1.6%, ±1.4%, n=10), and the NO-donator glyceroltrinitrate tends to decrease the force as well
(by 1.2%, ± 1.5%, with 2 mg/ml, n=9). Because of the small number of repetitions for each tested
variable, these in vitro results still require further verification.
CONCLUSION
Contractile cells containing smooth muscle actin are commonly present in the posterior layer of the
thoracolumbar fascia. The density of these cells is higher in younger people and correlates
positively with the amplitude of crimp in collagen fiber arrangement. Assuming the known
potential force of smooth muscle cells or contractile myofibroblasts, the amount of cells could be
sufficient to result in significant fascial contractions such as in compartment syndrome.
Using in vitro testing of fresh porcine lumbar fascia, a transient temporary contraction or release
can be triggered by electrical as well as chemical stimulation. We suggest that these preliminary
results support the possibility that active contraction of intrafascial smooth muscle like cells could
play a contributing role in temporary or chronic changes in force transmission of the thoracolumbar
5th Interdisciplinary World Congress on Low Back & Pelvic Pain
Melbourne, November 2004 www.worldcongresslbp.com
fascia. Further studies including antibodies specific for smooth muscle cells and in vitro tests with
human samples are needed to get a more specific understanding of fascial contraction. If verified
by future research, active fascial contractility could offer new insights for the understanding of low
back stability, compartment syndromes, and myofascial release therapies.
128
13 12
80
44 39
<32 yrs 54-56 yrs >71 yrs
Contractile Cells / mm2 Collagen Crimp (amplitude in 0.1 µm)
Figure 2. Comparison of density of intrafascial contractile cells and amount of collagen crimp
between 3 age groups
REFERENCES
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unembalmed cadavers: effects of tension to various muscular attachements. Spine 29(2): 129-
138
2. Yahia H, Pigeon P, DesRoisiers E A 1993 Viscoelastic properties of the human lumbodorsal
fascia. J Biomech Eng 15: 425-29
3. Schleip R 2003 Fascial plasticity - A new neurobiological explanation – Part 2. Journal of
Bodywork and Movement Therapies 7(2): 104-16
5th Interdisciplinary World Congress on Low Back & Pelvic Pain
Melbourne, November 2004 www.worldcongresslbp.com
4. Murray M M, Spector M 1999 Fibroblast distribution in the anteromedial bundle of the
human anterior cruciate ligament: the presence of alpha-smooth muscle actin-positive cells. J
Orthop Res 17(1): 18-27
5. Wilson C T, Dahners L E 1988 An examination of the mechanism of ligament contracture.
Clinic Orthop 227(2): 286-91
6. Ralphs J R, Waggett A D, Benjamin M 2002 Actin stress fibres and cell-cell adhesion
molecules in tendons. Matrix Biology 21: 67-74
7. Staubesand J, Li Y 1996 Zum Feinbau der Fascia cruris mit besonderer Berücksichtigung
epi- und intrafaszialer Nerven. Manuelle Medizin 34: 196-200
Citation:
Schleip R, Klingler W, Lehmann-Horn F: Active contraction of the thoracolumbar fascia - Indications of a new factor
in low back pain research with implications for manual therapy. In: The proceedings of the Fifth interdisciplinary
world congress on low back and pelvic pain. Melbourne. Editors: Vleeming A, Mooney V, Hodges P. 2004; ISBN 90-
802551-4-9