Introduction to biomechanics


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Knee Pain? Maybe It's Your Feet

There are several painful conditions of the(such as running or bicycling) can lead to
knee that may be caused by problems with yourinflammation where the iliotibial band
feet. The knee joint is one of the mostinserts into the outer knee. There are
complex joints in the body. It is a hingeseveral different foot problems that can
joint, a sliding joint and a rotating jointcause this inflammation. If the person is
all at the same time. The proper andflat-footed (over-pronatnor) this causes the
pain-free functioning of the knee requirestibia (lower leg bone) to excessively
near perfect alignment of the bones,internally rotate. This increases the
ligaments and tendons that make up the kneestretch on the iliotibial band and causes
joint. Pain in the knee is usually an earlyinflammation. On the other hand if someone
warning sign that something is wrong with thehas a high-arched foot, the foot is in a
alignment. It is important to address thesesupinated position (see normal foot motion)
problems early to avoid serious, long termand this too can cause excessive stretch on
problems  such  as  severe  arthritis.the iliotibial band and inflammation. These
two very different types of foot problems
The improper alignment that causes knee painresult in the same painful condition
is often the result of improper alignment of(iliotibial band syndrome). However the two
the joints of the foot and ankle. Let meproblems require very different treatments.
give  some  examples.In order to correct the problem it is
essential to determine what exactly is
Pain on the inside part of the knee may becausing  the  problem.
caused by bursitis at the location where
three of the tendons from the thigh musclesKnee arthritis can be caused or exacerbated
(sartorius, gracilis and semitendinosus) comeby problems with the foot. Someone that has
together and insert into the upper/inner partarthritis pain on the part of knee closest to
of the tibia (bone of the lower leg). Thisthe midline (medial compartment) may have a
condition is known as Pes Anserine bursitis.supinated foot that contributes to a
Pes Anserine is Latin for "goose foot". Ibow-legged type of stance. Someone with pain
suppose it is called goose foot because thesein the lateral compartment (the outer part of
three tendons coming together look somewhatthe knee furthest from the midline) may be
like a goose's foot. The pain is caused byflat-footed, a hyper-pronator, which leads to
inflammation of the bursa beneath these threea knock-kneed type of stance. Through the
tendons. A bursa is a fluid-filled sac thatproper use of a foot orthotic I believe that
is found where tendons and ligaments rubwe can, over time, reduce the load on the
against bone. The bursa is designed topainful knee compartment, reduce the pain and
prevent the bone from irritating and damagingat least slow down the degeneration of the
these tendons and ligaments as the rub backcartilage.
and forth over the bone. When these bursa
become inflamed this is known as bursitis.Pain in the center of the knee is often cause
Pes anserine bursitis is inflammation of theby chondromalacia patella, also known as
bursa beneath the three tendons that form theretropatellar (behind the kneecap) pain
goose foot. Pes Anserine bursitis can besyndrome. This is often seen in someone with
caused by excessive pronation of the foot.excessive pronation (flat-feet). As the knee
The excessive pronation (see article onstraightens and bends the kneecap is supposed
normal foot motion) causes excessiveto ride smoothly in a cartilage-lined groove
stretching of these tendons which over timeon the lower end of the femur (thigh bone).
results in inflammation. The treatment andSomeone that is a hyper-pronator has
prevention of this condition involves an archexcessive internal rotation of the tibia.
support  to prevent excessive foot pronation.This excessive internal rotation changes the
angle that the kneecap rides up and down in
Pain on the outside of the knee is sometimesthis groove (known as the Q angle or
caused by a condition known as iliotibialQuadriceps angle). Over time this leads to
band syndrome. The iliotibial band runs fromirritation behind the kneecap and the
the pelvis down the outside of the leg andretropatellar pain syndrome. An arch support
attaches to the outside part of the knee.or orthotic can be very helpful in treating
Problems with the foot together with overusethis condition.



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