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The locking position close to full extension of the knee is a small internal movement of the joint involving an inward twisting of the thigh bone, a small joint motion but crucial to knee function and illustrating the knee is much more than a normal hinge. The knee has unobtrusive movements which occur within the joint and because these are minor the knee loses significant function if any of this ability is lost. The small movements of joint slide and joint glide are known as accessory movements, occurring during normal joint motion but incapable of isolated performance.

The knee’s function is to complete two contradictory demands, the ability to move the body quickly into a newly desired position and the ability to keep the body stable and controlled in a chosen position. In the walking cycle the knee has to be a mobile limb for moving into the next position at one moment then at the next function as a reliably stable support. In the gait cycle the knees go through a repeated process of unlocking to move and locking to bear weight, permitting a human to walk significant distances with safety and effectiveness. Loss of the accessory movements may be involved in early knee problems.

The knee is very powerful but also capable of very fine movements in response to changes such as uneven ground. It has the power to allow us to squat down and stand up again without missing a beat. Side to side accessory movement in the knee is limited to a small range but this may help with adapting to an uneven surface, with a gapping of the inside of the knee joint the larger of the two movements due to the natural outward angulation of the lower limb and the weaker ligamentous support.

As mentioned in the preceding article, the knee mainly functions in one plane, that of backwards and forwards movement. If it is forced to move in a different plane, such as in the presence of bow leg or knock knee, there will be consequences in terms of degenerative changes in the knee compartments and in the patello-femoral joint. The knee compartments refer to the inner and outer halves of the knee, the medial and lateral compartments, each with its femoral and tibial condyle, ligament and meniscus. Alterations in the sideways angle of the knee joint changes the forces which pass through the compartments.

The development of an amount of bow leg at the knee changes the quadriceps pull so the kneecap is pulled to the inside, pushing it more forcefully against the inner edge of the groove it sits in, which can result in a painful condition. Along with this there are increased loads on the lateral compartment and this can hasten degenerative changes on that side. Normal knee joints naturally have some knock knee but if this amount is increased then the outside of the kneecap is likely to suffer from impingement pain.

If the knee is not capable of full extension then the kneecap can develop problems due to the persistent flexion which makes the quadriceps overactive to hold the knee in place, increasing patellar compression. This increased compression can cause a very common condition known as anterior knee pain or patellofemoral pain. To correct the lateral misalignment a small wedge can be placed under the outer edge of the heel to correct alignment of the shin and so influence the stresses which are passing through the knee joint above.

The patella can also give problems in response to abnormal changes in other joints. As we get older our foot arches can become less strong and so less pronounced, sometimes leading towards a degree of flat foot. As the feet rotate inwards on weight bearing the whole foot and shin move inwards to some extent, introducing an amount of knock knee effect at the knee. This can cause the kneecap to glide more outwards along the groove than normal and lead to patello-femoral pain. An effective treatment can be to wear orthotics in the shoes, which can combine restoration of the foot arches with the necessary level of medial wedging of the heel.

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The changes which occur as the knee becomes troublesome and develops pain are often due to injury of some kind, perhaps minor. Swelling can occur in the joint after even a minor injury and even a small amount of fluid in the joint can lead to complex side effects within the knee. The synovial joint lining secretes fluid in response to trauma and this fluid is held within the joint capsule, stretching and irritating it further in movement. Once the fluid is present a person tends to hold their knee in the loosest and most comfortable position of slight bend, around 30 degrees.

A permanent or semi-permanent bend in the knee, with a loss of extension, can appear if the knee is kept bent for too long without fully straightening. The medial part of the quadriceps muscle is responsible for rotating the knee into its locking position on full straightening, and if there is a contracture the muscle can waste and lose its strength. As the weakness progresses it becomes harder and harder to extend the knee fully.

Chondromalacia patellae is a commonly diagnosed problem with the cartilage on the underside of the kneecap. Normally the kneecap sits lightly against the groove on the front of the femur and is only strongly pressed against it in loaded movements such as getting up from a chair or descending stairs. If the knee tightens and loses some of its accessory movements then the patella can become more tightly compressed against the femur. This can set up a frictional process between the two bony areas, particularly if there is bow leg or knock knee, where the tibia is rotated abnormally or where one leg is longer than the other.

The joint surface of the kneecap can develop increased irritability and this limits the willingness to keep a bent knee for any time, preferring to straighten it to reduce the force. As increased forces bear on the kneecap, the articular cartilage lining it changes and becomes lined and fluffy instead of hard and smooth. Further irritation is provided by increased swelling in response to the joint surface changes, with grooves developing in the cartilage as it worsens. Subluxation of the patella, where it moves out of its groove to some degree, can occur with sudden movements such as turning and twisting.

If the patella subluxes this is a sudden and extremely painful event which traumatises the surfaces of the joint and can result in considerable pain and swelling of the knee. The kneecap usually subluxes or dislocates to the outside and this stretches the tissues which support the knee on the inner side, making them weaker and allowing the abnormal patellar movements to occur more commonly. In severe cases the patella can dislocate repeatedly which can be disabling and various operations are used to improve matters. The tissues can be tightened up on the medial side, known as reefing, to attempt to hold the kneecap more over to the inside.

A more major operation, performed if the more minor ones do not work, is to take the tibial tubercle, the bump centrally below the knee on the shin bone, and move it to the side, usually medially. This realigns the direction of the forces the quadriceps exerts across the kneecap and is designed to make the kneecap track more towards the inside. Arthroscopic investigation of the knee shows a softened, fissured surface under the patella as the cartilage becomes increasingly damaged. The joint inflammation and pain inhibits the quadriceps muscle from working, causing wasting.

The knee become gradually less supported as the main thigh muscle weakens and wastes, with going down slopes and stairs more difficult as these activities involve the imposition of greater forces across the patello-femoral joints. When we go downhill the quadriceps has to lengthen as it controls the body weight and this is a more stressful process than activities which involve muscle shortening.

The articular surface of the patella can be cleaned up surgically in a procedure known as arthroscopic debridement but the outcome is not always helpful. Approximation of the joint surfaces by exercises or manual pressures is used by physiotherapists but these techniques are not well supported by scientific evidence.

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Visit: www.whosp.com – Mr Harold from Auckland New Zealand suffered from many years severe pains in his back and joints and suspected he needed spine surgery and hip joint replacement. He could not find a definite diagnosis and then decided to come to India to Wockhardt Hospitals at Bangalore. He was put through a detailed medical evaluation and cross functional team of doctors examined him and found that he suffered from a rare neurological disorder called Piriformis Syndrome for which he underwent a minimally invasive surgery with an excellent outcomeAmongst the few hospitals in Asia equipped with most advanced Computer navigation and Minimal Access Surgery facilities to perform complex Knee, Hip and Shoulder joint replacement and Resurfacing Surgeries. Wockhardt Hospitals has a vastly experienced team of Orthopedic Surgeons and Rehabilitation Physiotherapy specialists and backed by the most comprehensive neuro-diagnostic and imaging facilities. Wockhardt Hospitals in Bangalore India is now the first choice for non insured self paying US patients. Few hospitals even in US can match the Orthopedic, Cardiac, Neuro and Minimal Access surgical services at this Indian hospital that has latest in diagnostic equipment such as EEG, ENMG, Video-monitoring, 1.5 Tesla MRI and 64-Slice CT Scan.

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Uncontrolled movements of the knee due to a lack of muscular control expose the knee to increased stresses and the knee and its cartilages (menisci) may suffer damage. One of the functions of the menisci is to control the large condyles of the femur as they move across the flat upper tibial surface and without this guidance there can be meniscal damage. The powerful condyles can move over the edges of the menisci, trapping them against the upper tibia and causing damage to their cartilaginous structure.

The types of damage pattern which can occur in the menisci vary and include the development of tears, splits and bites out of the edge. A “bucket handle tear” can develop if the condyle causes a circumferential split in the meniscus whilst the ends of the tear remain attached to the rest of the meniscus. An unplanned movement such as twisting and turning can damage a meniscus and dislodge a part of it into the joint as a loose body. This can move around inside the knee and jam between the surfaces of the joint, causing sharp pain and a giving way of the knee when it is weight bearing.

If the menisci become damaged with the ongoing wear process there is less precise condylar control of the femur and this can generate increased forces across the joint surface to the tibia. Degeneration can also occur of the articular surfaces themselves in response to the abnormal joint forces and osteoarthritis can be the result. Prior to modern arthroscopy the surgical management of meniscal problems was to remove the whole structure which typically caused knee arthritis later in life. The medial quadriceps muscle typically wastes with any knee problem and commonly many exercises are given for this.

The ranges of movement of the joint and normal accessory movements need to be restored for the medial quadriceps to respond to strengthening work. Knee extension needs to be full for the medial quadriceps to exert their full and functional force and the accessory movements contribute to the necessary play within the joint. If the full extension is not returned then the exercise to strengthen the muscles will likely be in vain. The development of modern arthroscopy techniques has allowed internal inspection of the joint and the ability to do the minimal intervention to achieve the required treatment goal.

The most common joint degenerative disease is the world is osteoarthritis, affecting many hundreds of millions of people and almost universally prevalent in old people to some extent. The likelihood of developing osteoarthritis is increased if there has been meniscal surgery, ligament or joint damage or a history in the family. With damage to the cruciate, medial or lateral ligaments there may be excessive internal joint movement which can lead to abnormally high joint forces and consequent joint surface degeneration. There can be high levels of force generated by the shearing forces acting laterally across a joint.

Early stages of knee change with age can include some clicking and grating with the knee only feeling uncomfortable if it is held in one posture for too long. If we lack the stresses at the end ranges of the joint because we do not perform vigorous activities any longer then the joint capsule can become tight. This can make it more vulnerable to injury during movement and can compress the joint to some degree, increasing the forces across the weight bearing surfaces. The cartilage can wear down and the bone underneath, which usually has some pliability, increases in density in a process known as sclerosis.

An arthritic knee can be enlarged, swollen, hot and painful with limited range of movement, crepitus on motion and a degree of disability. Pain and swelling can go through repeated cycles and gradually become worse as the joint deteriorates. Walking may be limited and the knee pain can disturb sleep due to the difficult in maintaining a position. As the inside of the joint can become very tender it does not tolerate pressure from another knee or the gapping pressure which can occur when we lie on our sides. A pillow between the knees is typically required.

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Treatment for lower back pain includes several options, including exercise and medication. Causes of back pain includes lumbar spinal stenosis, where the spinal canal slowly begins to narrow over time. Other sources of back pain includes sciatic nerve symptoms and piriformis syndrome. Dr. Mayra Alfonso, MD is an expert in the management of back and neck pain, and has been in practice since 1996. Her newly launched web site Back Pain Watch – www.backpainwatch.com – strives to give you valuable and expert advice, tips and information on your back pain issues. You can get her exclusive FREE REPORT where she reveals How To Get Rid Of Back Pain Once And For All, by visiting http right now.

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The wrist has a large, three hundred and sixty degree cone of movement facing forwards at the end of the arm, a consequence of the close arrangement of the small carpal bones. Group movements or individual ones between the bones can occur and this allows precise control of the hand, thumb and fingers. The rows are arranged irregularly but in general two of the bones line up with the end of each of the metacarpals. This allows the creation of a line of several joints leading to each finger which enables the separate and flexible movements of the hand.

The wrist bones are a grouping of eight small bones called the carpal bones and which are arranged in two rows between the metacarpals and the ulna and radius of the forearm. From the end row of carpal bones the metacarpals run down the hand to the junction with the phalanges at the knuckles, making a mobile central hand area. Running virtually parallel to each other and being long and narrow the metacarpals can alter their positioning, either becoming flattened to support something large or rotated round to cup the palm for increased grasping ability.

Human hand function is a highly complex process as the thumb, fingers and hand are placed in a precise posture to suit the task being performed, with the wrist performing a pivotal role. The major, less precise, arm positioning is provided by the shoulder and shoulder blade, the body to hand distance is controlled by the elbow, the wrist angle is set by the forearm and the last adjustments of hand position are performed by the wrist. The movements become more precise the closer the joint becomes to the wrist.

The thumb is the most manoeuvrable and astonishing part of the human hand. We possess an “opposable thumb” which is absent from apes and allows us to achieve the high levels of precision movements we require. On the outside of the hand the thumb’s metacarpal is not flat in the same plane as the others in the palm but is turned inwards, giving it the function of crossing the palm to allow the thumb to meet the ends of the fingers in gripping. Much of the specialised thumb movement comes from the junction of its carpal and metacarpal bones.

The movements of the carpal bones can be in unison in small amounts as they move together to allow a movement to occur. As the hands move small amplitudes of movement occur between the individual carpal bones and the carpal rows. The metacarpals are able to rotate around their long axes which allows the palm to be curled into a cupped position. As the palm moulds round to assist gripping it also allows the fingers to align so that they can effectively grip at the correct angle. Any loss of the accessory movements of the carpals and metacarpals can reduce the ability of the hand to function adequately.

Wrist function can be adversely affected by heavy work with the hands such as grasping and pulling heavy objects, pulling ropes and using vibrating machinery. When the hand is grasping something firmly the longitudinal forces this generates are very great as the carpal bones are compressed between the metacarpals and the forearm bones. This can cause a reduction in the essential accessory movements of the carpal bones. Forced extension of the wrist may wedge one of the carpal bones, the lunate, slightly forwards which causes pain and disability.

A fall on the outstretched hand (FOOSH) is the most typical reason for the wrist to be extended forcibly and a Colles fracture is a common result where the break is located in the last inch of the radius and ulna near the wrist. Older women are most likely to suffer from this fracture and although most attention is concentrated on the fracture there is often a significant soft tissue injury of the wrist bones as well. The fracture will heal in five or six weeks but pain, weakness and functional difficulty may persist for much longer, related to some extent to the loss of individual movements between the carpal bones.

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The amputation of a leg is a major happening for a person and represents an upheaval in their life, with psychological problems added to the difficulties of learning the rehabilitation, the management of the new prosthesis, and the relearning of ambulation. The surgeon’s plan will be to manage the process to allow the patient early access to rehabilitation, reduce their energy requirements in walking to the minimum and allow them to manage the prosthesis successfully. Many new skills have to be learnt such as mobilising without the new limb, checking the skin pressure areas and managing to get the limb on and off.

A skilled and experienced team is required to teach the patient all the knowledge and skills they need for maximum independence and this includes the surgeon and his team, the medical advisers, the prosthetist, an occupational therapist, the physiotherapist and employment and social facilitators. Lower limb amputations are increasing as the populations of industrialised countries continue to age and with that the main reason for amputation, peripheral vascular disease. The ratio of below knee amputations to above knee amputations has changed as surgical skills for keeping the knee joint have increased, leading to the present occurrence of 70% below knee.

Weight transfer can be achieved indirectly by allowing pressure through a bony point higher up the leg and also by effecting force transfer through the sides of the leg tissues. There may often be a pain issue after this procedure despite modern prosthetic accomplishments and if the pain is significant it can lead to limited use of the prosthesis, functional reduction and eventually to further attempts at surgery.

Other reasons for amputation are less common and include tumours, infections and congenital abnormalities of the lower limbs. Overall amputation is considered an operation which involves reconstruction rather than just removal of a limb, as the patient’s future life and independence is the crucial matter. The higher that the surgeon has to amputate the limb the higher levels of energy are needed for walking, with the speed of walking decreasing and the required oxygen consumption increasing. Low below knee amputation may make little difference to the energy required for gait, however once the level moves up to mid thigh the load may be over 50% more.

The amount of energy needed for normal ambulation is vital as patients who have had an amputation typically have vascular disease and other medical problems which require them to use most of their limited available energy in walking. If so much energy is consumed by simply walking then functional independence may be unrealistic. Healing of the tissues and the skin after amputation may be difficult or slow due to the likely ischaemic nature of the limb’s tissues, making important limits to the eventual independence of the patient. The interface between the prosthesis and the leg is now performed by the soft tissues at the site.

The amputation stump region must be large enough and the tissues be of good enough quality to allow effective gait by transmitting the lengthways and shearing forces which will be transmitted through it from the socket of the new leg. Direct weight bearing on the end of the stump can occur in amputations which are performed through a joint such as the knee and the ankle, but this style of amputation has its difficulties. The new knee joint is inevitably formed below the level of the old one, causing the knee to stick out obviously further than a normal knee and the calf to be correspondingly shorter.

More indirect weight transfer can be accomplished by allowing a higher bony area to take some of the force with other forces being transferred across the sides of the soft tissues of the leg. Pain may still be an issue for many patients despite the great advances made in prosthetic technology. If the pain is severe enough it can lead to further surgery, reduced function and limited wearing of the artificial limb.

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