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Good Works at the Canandaigua VA
Faculty and students of the Finger Lakes School of Acupuncture and Oriental Medicine (FLSAOM) of the New York Chiropractic College have provided acupuncture to veterans at the Veterans' Administration Medical Center (VAMC) in Canandaigua, New York since September of 2007.
The First (Only) Choice for Spinal Pain
The study on NSAIDs for spinal pain summarized on the front page of this issue is intriguing on a number of levels, the most obvious being the conclusion that "compared with placebo, NSAIDs do not provide a clinically important effect on spinal pain, and six patients must be treated with NSAIDs for one patient to achieve a clinically important benefit in the short-term."
Caring for Refugees in Greece
At the beginning of 2016 I had no idea what was in store for me, but I was looking forward to a personal retreat on the Greek island of Paros; a graduation gift to myself after 22 years of motherhood, and four-plus years of Chinese medicine school.
The Qi Focus: A Guide to Managing Stress
Stress, are you experiencing heightened stress levels? Your own, and your clients? Is Trumpitis getting to you? I recently polled a cluster of acupuncturists, Asian Bodywork Therapists (ABT) and psychotherapy colleagues on the issue.
Treating LBP the Right Way: Think Natural
An updated clinical practice guideline from the American College of Physicians (ACP) recommends spinal manipulation and other non-invasive, non-drug therapies as first options for acute, subacute and chronic low back pain, rather than pain medications, as stipulated in the original 2007 guideline.
Chiropractic: A Great Fit for the White House
Dr. Eric Kaplan is a New York Chiropractic College alumnus; a No. 1 best-selling author whose books include Awaken the Wellness Within and The 5 Minute Motivator; a chiropractor for professional sports teams and elite athletes; and even served as an advisor under the Clinton Administration to the President's Council on Sports & Physical Fitness.
Treating the Terrain of Chronic Sinus Infections
Chronic sinus infections can be stubborn to treat, but the therapeutic path forward can be simplified when utilizing three distinct treatment principles which take into account the terrain of the body, and the way in which microbes grow.
Making Sense of Liver Regulation
In Chinese medicine, the liver has the function of moving and storing qi and blood. In its moving function, the liver smoothly distributes qi and blood to the tendons, muscles and flesh through microcirculation.
Give Your Patients the Ergonomic Advantage
Prolonged sitting contributes to low back pain and is a health risk. When I discuss my POLITE technique practice recommendations with patients, ergonomics may be last, but not least!
Toxicity & Kids: The Importance of Environmental Intake
The old adage is true that children are not little adults. Traditional Chinese medicine (TCM) has long known that the physiology of children is unique, as are the diseases that plague them.
How to Correct a Cuboid Subluxation
Cuboid subluxation is a poorly recognized condition, even though it is not uncommon. It has been described in the literature under various names: cuboid subluxation, cuboid syndrome, locked cuboid, dropped cuboid, cuboid fault syndrome or peroneal cuboid syndrome.
Shedding Light on the Benefits of Heliotherapy
I can't imagine anyone not feeling good strolling in the sun on a beautiful spring day. The sun is responsible for all life on earth and is best illustrated along the equator touting the richest biodiversity on the planet, in stark contrast to the Arctic Circle and South Pole.
Waist Circumference: A Conversation Starter (Part 2)
Now let's discuss the clinical approach to reducing WC and implementation in today's chiropractic practice. The primary intervention centers around dietary modification and lifestyle habits aimed to reduce adiposity, improve insulin sensitivity and ultimately, diminish systemic metabolic dysfunction.
News In Brief
A "Modern" Business Model. Acupuncturists may have a new professional atmosphere to consider, as a new concept is on the horizon - at least for one business.
Scope of Chiropractic Practice: Why Now Is the Time to Expand
In my January article, "Scope of Chiropractic Practice: Is It Time for Change?" I discussed the use of the term primary spine care practitioner, the loss of privileges to diagnose in Texas, and the fact that the definition of "chiropractic" varied from state to state.
5 Ways to Enhance Your Family Practice
Every practice has a personality style. A practice that caters to athletes, PI cases or adults, for example, projects differently to patients than a family wellness practice.
Help Save an Important Chiropractic Landmark
The chiropractic profession has a splendid and varied history. Sadly, many landmarks have been lost to bulldozers and wrecking crews, such as the Ryan Building, Little-Bit-O-Heaven, Spears Chiropractic Hospital, and Clearview Sanitarium.
Integrative Cardiology: The Heart of TCM & Western Medicine
Patient centered therapy is a growing trend in hospitals that are expanding to boutique services.
The Chiropractor's Guide to CRISPR
Science magazine's "Breakthrough of the Year" award for 2015 was described as "the gene-editing tool called CRISPR." CRISPR stands for "clustered regularly interspaced short palindromic repeats."
What's Bugging You? Probiotics and Your Health
An estimated 100 trillion microorganisms representing more than 500 different species inhabit every normal, healthy bowel. Gut-dwelling bacteria keep pathogens in check, aid digestion and nutrient absorption, and contribute to immune function.
Insomnia Treatment Based on the Yu Theory
In recent years, acupuncture has risen in popularity as a form of alternative or supplemental medicine for the treatment of many different types of disorders.
NSAIDs No Better Than Placebo for Spine Pain
A meta-analysis of randomized, placebo-controlled trials comparing the efficacy and safety of NSAIDs with placebo for spinal pain concludes that among 6,065 spine pain patients, "NSAIDs reduced pain and disability, but provided clinically unimportant effects over placebo."
An Exploration: Tendon Sheaths & Retinacula
One of the unique mechanical properties of our human structure is the presence of a retinaculum (plural: retinacula) around many of the joints of the body. A retinaculum is a band or membrane that holds an organ or part in its place. It may also be defined as a thickening of the deep fascia in distal portions of the limbs that hold tendons in positions when muscles contract.1
The structure of the retinacula in different regions of the body greatly aid mechanical function of the muscles and tendons acting on that region. Yet there are also some structural challenges with the retinacula that lead to a number of soft-tissue disorders.
A retinaculum is composed of dense fibrous connective tissue that is an extension of the deep fascia. It often acts like a ligament in that it does not have contractile properties and may help with joint stability.
Most of the retinacula in our body are found in the distal upper and lower extremities where they play a key role in helping generate forces for the muscles and tendons in this area. The function of the retinacula become much more apparent as we look at how they interact with tendons in the distal extremities.
Many tendons in the distal extremities are surrounded by a synovial sheath. The synovial sheath is one of two fibrous membranes that may cover the tendon. However, not every tendon has a synovial sheath. In fact, most tendons do not.
The synovial sheaths are prevalent in those tendons of the distal extremities that course underneath a retinacula (Figure 1). The purpose of the tendon sheath, as we will explore below, is to reduce tension between the tendon and the binding retinaculum.
Most muscles have a relatively straight line of pull without any obstructions in their way. For example, the pectoralis minor (Figure 2) has a short and straight line of pull between its attachment points on the coracoid process and the ribs with no significant angle to the tendon.
The muscles of the distal extremities are different. In the long tendons of the hands and feet the tendons do not have a straight line of pull. In some instances the tendon must take almost a right angle turn. The long extensors of the toes (Figure 3) are a good example. They travel the length of the lower leg and then over the top of the foot to the toes. They must make almost a 90 degree angle bend over the top of the foot near the ankle joint.
In order for these tendons to be mechanically efficient they must be held close to the joint. If they weren't, the tendons would be pulled away from the joint when the muscle contracted and the muscle would lose its mechanical efficiency. The body creates a natural pulley-like structure with the retinaculum that improves the mechanical efficiency of the tendons by holding them close to the joint (Figure 4).
By holding the tendons close to the joint, the binding retinaculum greatly improves the efficiency of the contraction force generated by the muscles and transmitted through the tendon. However, there is a potential downside to this arrangement as well. Holding the tendons close to the joint while they are trying to slide back and forth greatly increases friction between the tendon and the retinaculum. This excessive friction can lead to tendon damage.
The body has compensated for that potential problem by enclosing these vulnerable tendons in a synovial sheath. The tendons slide back and forth inside the synovial sheath and therefore do not rub against the binding retinaculum. If the synovial sheath were not present, the friction against the retinaculum would damage the tendon fibers.
Presence of the synovial sheath does not completely resolve the friction problem for these tendons that bend underneath a retinaculum. Sometimes repetitive motion or compression during movement will cause an irritation between the tendon and its surrounding synovial sheath. Fibrous adhesions or a roughening of the surface between the tendon and its sheath may develop. This condition is known as tenosynovitis.
There is a common tenosynovitis condition that develops over the top of the foot where the long extensors of the toes pass under the extensor retinaculum. If there is excessive compression of these tendons, tenosynovitis may develop. In this region it is commonly called "lace bite" because tight shoelaces are often the primary cause.
Tenosynovitis is treated very similar to tendinitis. Deep friction massage over the affected tendon may help mobilize the tendon and reduce adhesions between the tendon and its sheath. However, activity modifications and reduction of tendon compression is crucial to fully resolve this problem.
Retinacula in the distal extremities also end up playing a prominent role in a number of other pathological conditions. When they span across joints they create space underneath that is occupied by tendons, arteries, veins, and nerves.
The space underneath these retinacula are the soft-tissue tunnels that we commonly hear about, such as the carpal tunnel in the wrist or tarsal tunnel in the foot. Since the retinacular tissues are a dense fibrous connective tissue, they often produce an unyielding wall to the tunnel which can then lead to various nerve or vascular compression problems. Most well-known nerve compression problems are named for the retinacular tunnel where the nerve is getting squeezed.
When attempting to treat a nerve compression problem under the retinaculum, keep in mind that unlike muscle tissue, the retinacular tissue is not contractile tissue and does not "let go." There is usually not a benefit in trying to work directly on the retinaculum to decrease the pathological nerve compression and further compression directly on this area may aggravate the condition.
Treatment strategies need to focus on other methods to help reduce compression on the nerve within the tunnel. This usually means an emphasis on biomechanical change, reduction of offending activities, or both.
Most of the time a retinaculum is spanning the joints of the distal extremities to help produce mechanical advantage of the tendons. However, in other places the retinaculum has a different mechanical function. The quadriceps (or patellar) retinaculum is a very good example.
The quadriceps muscle group is large and has to generate very strong contraction forces across the knee during locomotion. Most anatomy references show the four quadriceps muscles blending into the patellar tendon. The patella is actually a floating bone that is embedded within the tendon.
However, there is a significant expanse of connective tissue from the distal quadriceps muscles that does not go directly into the patellar tendon. It does eventually connect with the proximal tibia and gives a much greater contact area for the quadriceps connections (Figure 5).
This expanse of connective tissue on both sides of the knee is the patellar (or quadriceps) retinaculum and it serves to spread out some of the contractile force of the quadriceps and decrease the overall load on the patellar tendon.
An important consideration of the patellar retinaculum is that these tissues are richly innervated. The rich innervation of the patellar retinaculum plays a part in another common problem affecting the knee region called patellofemoral pain syndrome. And imbalance of forces between the quadriceps muscles can cause the patella to be pulled more to one side (usually laterally) during movement.
When the patella is pulled more to one side there is excessive tension on the retinacular fibers of the opposite side as they are attempting to offset those forces. Excess tension on the retinacular tissues is likely the cause of pain in many patellofemoral pain conditions.
Massage therapy can be an effective method to address the anterior knee pain and tracking disorders affecting the patellar retinaculum. Deep stripping applications applied directly to the patellar retinaculum, especially during active movement are particularly helpful. It is also very important to work the entire length of the quadricep muscle group as these powerful muscles are the ones that are pulling on the retinacular fibers.
The retinacula and their associated tendon sheaths play a crucial role in the mechanics of our distal extremities. The significant range of motion we have at these joints where tendons must bend at very sharp angles pose serious mechanical challenges and often lead to overuse tendon disorders.
It is very helpful when we understand the mechanical demands placed on these tissues and how our soft-tissues work can help them operate as efficiently as possible. If you want to see a more thorough visual description of tendon sheaths and retinacula, make sure to check out this video.