Introduction to biomechanics


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BIOMECHANICAL TATTOO one leg longer than the other
biomechanical tattoo  

Low Back Pain - Physician Advice on Relief and Causes

Low back pain is one of the most commonfoot. One may notice the affected leg is weak
reasons for visiting a primary careand have foot drop or the inability to extend
physician. People may experience back painthe great toe. Although pain caused by a
after lifting heavy objects, twisting andpinched sciatic nerve (sciatica) can be very
turning their backs during exercise orpainful and debilitating, there is no risk of
household chores, or after a period ofpermanent nerve damage or paralysis. Sciatica
inactivity. This article discusses theis treated with physical therapy, massage,
possible causes and treatments for manyanti-inflammatories and manipulative
sources of lower back pain.treatments.
Low back pain is one of the most
common reasons for visiting a primary careA herniated disk or narrowed spinal column
physician. People may experience back pain(spinal stenosis) can also cause low back
after lifting heavy objects, twisting andpain. The pain is achy or sharp and can
turning their backs during exercise orworsen suddenly if nerves are compressed,
household chores, or after a period ofleading to the symptoms discussed above. A
inactivity. Acute low back pain is oftenprimary difference between these conditions
caused by muscle inflammation and spasm andis that the pain from a bulging disk is made
may start suddenly or increase gradually overworse from bending forward and decreased by
time. It may occur in the center of the lowleaning backward. The opposite is true for
back or next to the spine on either side. Thespinal stenosis pain. The pain from both of
pain from muscle strain and spasm is oftenthese conditions gets better with laying
achy and crampy with periods of sharpnessdown. Thee pain caused from sciatica is
that occur because of "stressing" theusually is not relieved by laying down (it
involved muscle. Laying down usually relievesmay even get worse). The development of
the pain. The pain is often accompanied bysudden leg weakness, lack of sensation in the
stiffness when moving the lower back and verypelvic area and involuntary leakage of urine
tender muscles. It will usually get betteror stool are signs of cauda equina syndrome.
with regular use of rest, heat, massage andThe cauda equina is a "tail" of nerves at the
or anti-inflammatories and/or muscleend of the spinal cord. If these nerves are
relaxants for two to four weeks. Moist heatpinched, it produces the cauda equina
applied for 20 minutes three to four timessyndrome. In addition to the conservative
daily and taking 200 to 800 mg per day oftreatments for a pinched nerve, surgery may
ibuprofen helps relieve the contracted andbe an option to reduce the impingement by
inflamed muscles. People can hasten recoveryremoving the disk or fusing the vertebrae to
by continuing to be as active as toleratedwiden  the  spinal  column.
and not to lift heavy objects or move in ways
that  aggravate  the  pain.Other non-muscular and non-neurologic causes
of back pain are infection and cancer.
Low back pain which lasts more than 6 weeksWarning signs that these conditions may be a
and/or begins to change in character needs tocause of acute or chronic low back are fever,
be evaluated by a physician. If the painchills, lack of improvement with regular use
becomes sharp and begins to radiate into theof anti-inflammatories and exercise, and pain
buttocks or down the legs, a nerve may bethat worsens with laying on the back. It is
pinched. The most common nerve affected byimportant to inform a physician about these
muscular spasm, spinal stenosis or asymptoms so that blood tests and imaging
herniated disk is the sciatic nerve. Thestudies can be ordered to diagnose and treat
sciatic nerve is a combination of nerve rootsthese  conditions before complications arise.
which come from the lower spinal cord (L4-S3)
and form the largest nerve in the body. WhenThe injury associated with low back pain can
a combination of the nerve roots or the wholebe prevented by regular exercise (such as
nerve is pinched, one experiences pain,walking and low back exercises), maintenance
tingling or numbness in the buttock or theof a healthy body weight and using correct
backside of the leg past the knee to thebody mechanics when lifting heavy objects.



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