Joints Bones One Health And Social Care Essay

Joints Bones One Health And Social vexation EssayIn both chapters six and seven we volition take a detailed timbre at our skeleton and the sums and attachments. We will briefly introduce the skeleton here in chapter six besides discuss it in greater detail and specificity in chapter seven. Thus our focus in chapter six will mainly be on our enounces, how they suffer us to move and how they be categorize. You will nonice that the various(a) articulations in our body allow distinct turn overs of inquiry. In general, the more mobile a joint, the less immutable it is, making it more prone to distress. The lift joint is a nice casing. However, there atomic number 18 another(prenominal)wise factors that affect our mobility and stability much(prenominal) as ligaments, t nullifyons, skin, gristle and daily activity. We will look at these in greater detail over the next a couple of(prenominal) chapters. But lets start by taking a simple look at the basic functions of the skeleton.Basic Skeleton FunctionThe skeleton is our basic textile of support for all body winds. It is our internal scaffolding that provides support for organs, allows military campaign, and gives us protection. The skeleton governing body is the give ear that is given to the collection of about 206 mug up in addition to the joints and ligaments.The skeleton has more important functions that variegate in complexity still generally involves the following ( go in simple skeleton schematic)1. It protects the bodys vital organs such as the brain, heart, lungs and other organs.2. It gives us our shape, posture and support.3. It provides sites for muscular attachment that allows us to move.4. It provides a reservoir for the stock of minerals such as calcium, phosphorus, fat, magnesium and many other minerals.5. It is an important site for the production of blood cells, specifically red blood cells that allow us to transport oxygen.Our skeleton is a complex living syste m that is constantly changing. We will discuss many of these components in Chapter 7. However, at this stage we are interested in the spot of the skeleton in how it allows us to move. In order to do this we need to take a look at our joint structure. The 206 fig outs in our body form approximately 230 joints.The joints are apparently the regularize where deuce finger cymbals meet. Joints, which are in homogeneous manner referred to as articulations, come in many different forms and not all are movable. The tier of mobility in a joint has a lot to do with its role or addition to its shape. The joints fall into triplet categories synovial, stringy or cartilaginous. They vary in ordure and design.Types and Classification of JointsJoints are found anywhere that two grind away meet. They save a specific and intrinsic operate of motion ranging from extremely movable to unmovable. While virtually of our joints are freely movable, many are not. Joints are classified in sever al(prenominal)(prenominal) ways. For example, we classify almost according to their architecture or their orbital cavity of motion. Commonly, we use a mix of anatomical architecture and range of motion. In terms of movement, joints squeeze out withal be classified according to the number of cardinal imagees in which they post move. therefore, joints can be non-axial (allowing no movement in any plane), uni-axial (movement in one plane of motion), biaxial (movement in two planes of motion), or tri-axial (movement in three planes of motion). Those joints that are freely movable are also referred to as synovial joints because at the end of the hit the books is a smooth covering tier called the synovial membrane. This membrane secretes a lubricating essence called synovial fluid which allows the joints to move in a smooth and fluid fashion. As this membrane breaks set down over time we often experience more discomfort in our joints with movement. This is a form of arthritis.( Chapter 8 in Seeley has great illustrations for all of this chapter)Joints are recipely classified as belonging to one of three sub-classes. These classifications are based on several factors, includinga. the presence or absence of a joint pitb. the shape and nature of the connectionc. the stage of movement.The three sub classes are as followsSynovial or Diarthrosis joints (freely movable).Fibrous or Synarthrosis joints ( realty).Cartilaginous or Amphiarthrosis joints (slightly movable).Synovial or Diarthrosis JointsThese are the freely movable joints such as the shoulder, articulatio genus, ankle, etc. With this face of joint the articulating finger cymbals are covered with articularyyy cartilage which is fenceed by an articular capsule which is line with a synovial membrane. The articular surfaces are smooth and allow easy fluid movement. The synovial joint has two main functions. One is to allow movement, temporary hookup the second is to transmit forces from one segment of the body to another segment, or one parting of a limb to the other.The interactions surrounded by bones at an articulation are regulated by several types of structures. There include the joint capsule, synovial membrane, ligaments, bone shape, articular cartilage and pressure. However, it is the general structure of the synovial joint that permits smooth movement. Synovial joints have five characteristic features. They all yield the following which facilitates their range of motiona. articular cartilageb. joint cavityc. articular capsuled. synovial membranee. synovial fluidThese contents and musical arrangements allow the bones to move and move a coddle separately other. This synovial arrangement allows for the greater range of movement of any joint types and movements permitted include the following gliding, hinge, pivot, circumduction. Of these movement types gliding is the most common as it occurs in every synovial joint since it allows them to simply glide over each ot her. In some joints, akin the carpal and tarsal joints, gliding is the only movement possible. The articular end of bones in a synovial joint are covered with hyaline cartilage (articular cartilage) and a surrounding tubular capsule which we call the joint capsule. The joint capsule is composed of an outer layer of ligaments and on the inside contains a synovial membrane which secretes synovial fluid. Some synovial joints have spare features. For example the knee contains small shock absorbing pads called menisci. Menisci are actually small pieces of fibrocartilage situated between the bones to absorb shock. Joints with menisci also have small fluid filled sacs called bursae. Bursae are also lined with synovial fluid and also help with smooth joint movement.Lets look at the synovial joints in more detail.There are six types of synovial joints. If you read different textbooks you will notice several different terms for the same type of joint. Where appropriate the other terms are a lso provided.(Insert Figs 8.8-8.12 from Seeley)( overly insert table 7.4 from Shier)a. Pivot Joint. This joint comprises a ring of bone that rotates around another. An example of this is found in the neck (the atlanto-axial joint). This joint is also referred to as a troichoidal or screw joint. This type of joint can also occur when two long bones fit against each other so that the bones roll around each other as with the radius and the ulnar in the forearm. The only type of movement that pivot joints allow is rotation. This movement only occurs in one plane and is therefore uni-axial.b. freak and Socket Joint (enarthrodial, spheroidal). This joint is the most mobile and allows movements in all directions. Examples include the hip and shoulder. The high degree of mobility also causes the joint to be less stable. In this type of joint, the head of a long bone fits into a cuplike structure of the other bone. If you think about the trailer and hitch setup on a car, the joint is highly mobile and allows movements in the three cardinal planes and is therefore referred to as tri-axial.c. flexible joint Joint (ginglymus). This joint allows flexion and appendage (but not rotation). For this reason it is referred to as a uni-axial joint. Examples are the cubitus and the knee joint. This joint structure contains strong ligaments and is therefore a very stable joint.d. Ellipsoid (condyloid, ovoid). This joint is essentially a less flexible version of the ball and socket joint. This joint has an oval surface that fits into a reciprocally shaped concave disc surface. This joint allows movements in tow planes and is therefore biaxial. It allows flexion and extension movements, and abduction and adduction and therefore circumduction as these movements can occur in concert. Examples include the radiocarpal joints.e. Saddle (sellar, carpometacarpal). The visual of a riding level is a good image to depict this joint. The bone surfaces are both shaped like a riding saddle an d therefore fit over each other allowing flexion and extension, and abduction and adduction. Even though this joint has the same movement capabilities as the ellipsoidal, it has a greater range of motion. The joint is therefore biaxial. An example is the carpometacarpal joint of the thumb.f. Gliding (plane, arthrodial). In this type of joint the articulating surfaces are almost flat and so the surfaces glide over each other. This motion is fairly limited and the joint is viewed as a non-axial joint. Examples of this joint include the intercarpal and intertarsal joints.There are also other synovial type structures that are associated with the diarthrodial joints. They are called bursae and tendon sheaths. analogous other aspects of the joint capsule these are susceptible to injury and breakdown over time ca give wayment discomfort and pain. The bursae are small capsules lined with synovial membranes that also contain synovial fluid. Their role is more for cushioning between the bon es as opposed to providing a fluid lubrication surface (although they do that also). A primary role of bursae is to separate tendons and bone which reduces the friction during movement. Tendon sheaths are also synovial structures that surround tendons. Tendon sheaths are double layered structures and they also add an element of protection to many tendons that cross joints, such as those in the hands and wrist.Fibrous or Synarthrosis JointsThese joints do not contain an articular cavity and are generally viewed as immovable. These joints are made mainly from sinewy link tissue and can move very little. They are mostly concerned with absorbing shock. In this type of joint two bones are joined in concert by a fibrous connective tissue. There are two basic types of fibrous joints.a. Sutures. This type of joint is found only in the skull. They are very rigid joints designed mainly to absorb impact. The design of these joints is such that grooved or jag bone ends are attached by tightl y connected fibers. This also allows skull festering. As an adult these fibers deject to ossify and are eventually 100% replaced by bone and then are basically immovable versus somewhat movable in growing children.b. Syndesmoses. Like sutures, dense fibrous tissues bind the bones together allowing limited movement (although more than sutures). Examples in the body include the coraco-acromial joint. In this joint arrangement the bones are usually further apart than they are in sutures and are joined by ligaments. Hence, allowing some movement.The teeth are also an example of a particular type of fibrous joint. Sometimes they are called peg and socket joints. This joint is more accurately referred to as a gomphosis joint. Gomphosis literally substance a come off in Greek. A gomphosis joint is an articulation via the insertion of a conic process into a socket (hence the bolt). If you opine the root of your tooth into an alvestus (small hollow) in your jaw, this is the form it take s. A gomphosis is not really a connection between two bones even though it is considered a fibrous joint.Cartilaginous or Amphiarthrosis JointsThese joints do not contain an articular cavity but are viewed as slightly movable. They allow a twisting or bending motion. There are two basic types of cartilaginous joints differentiated on whether they joint together using hyaline cartilage (sychondroses) or fibrous cartilage (symphyses)a. Sychondroses. This literally means held together by cartilage. The bones are held together by a thin layer of hyaline cartilage. Examples include the sternocostal joints. The growth plates of bones are sychondroses. Interestingly, many sychondroses are temporary as bone eventually replaces the cartilage forming a synostoses (when two bones fuse together to form one bone).b. Symphyses. These joints are connected by fibrous cartilage which allows slight compression. In these joints a thin layer of hyaline cartilage separates a dish antenna of fibro carti lage from the bones. Again, the joints allow limited movement. Examples include the vertebral joints.(Insert Table 8.2/8.1, Seeley)Joint lubricationThe smooth movement of synovial joints is made possible by several features. We generally diagnose two forms of lubrication and refer to them as bound lubrication and fluid film lubrication. The fluid film lubrication is really what allows us our day to day fluid movement as it comprises a thin film of lubricant that separates the bones. It functions for the most part under low scores with higher speeds. As an interesting side note synovial joints can self-lubricate by shifting the synovial fluid bear out and forth under bone surfaces as the bones move. Boundary lubrication on the other hand is more important for higher stress loads over longer periods of time.CartilageIn the earlier section on synovial joints we introduced the terms articular cartilage and articular capsule. We also discussed the role of the synovial fluid in lubrica ting these joints. Like any mechanical device, be it a bicycle compass or car engine or human joint, lubrication is vital for proper functioning. In humans, a exsanguine connective tissue known as articular cartilage provides this lubrication. This black-and-blue dense cartilage coats the ends of the bones in diarthrodial joints allowing movement with minimal friction, wear and pain. It also spreads the load at the joint over a wider area decreasing pressure and stress at any contact point. Estimates suggest that articular cartilage can reduce the contact stress on bones and joints by up to 50%. articulary cartilage is somewhat unique in its design as a living substance. Articular cartilage contains no blood vessels, nerves or lymph vessels. Water makes up most of the mass of articular cartilage with estimates ranging from 65-80% of the weight of the time. Articular cartilage is also referred to as a viscoelastic tissue, sometimes this is referred to as biologically time pendant . What this means is that when you apply a constant load over time to the cartilage, its mechanical appearance (and shape) will also change over time. An example of this is an increase in the thickness of cartilage that occurs from economic consumption as greater volumes of fluid move in and out of the jointCartilage is a connective tissue that comes in several forms. There are three recognized typesa. hyalineb. articularc. white fibrocartilageHyaline cartilage is smooth with shiny physical properties of a glue-like substance (even though it lubricates). The term hyal means glassy.Articular cartilage lines the articular (smooth) surfaces of the bones allowing for efficient smooth movement.White fibrocartilage is a strong fibrous tissue saturated with the glue-like cartilage that gives it a very strong tendon-like property.Articular fibrocartilage is found in amphiarthroses joints. This articular fibrocartilage is found as a fibrocartilaginous disc known as a menisci. This is the d esign in the intervertebral discs. The role of menisci are somewhat unclear but are believed to help reduce shock.The concluding articular component is that of articular connective tissue. Articular connective tissue includes both tendons and ligaments. The tendons connect heft to bone and the ligaments connect bone to bone. These connective tissues are passive tissues comprised mainly of collagen and elastic fibers. These tissues are minimally extensible with no contraction ability and instead return to resting length as the muscle relaxes and the opponent contracts. These tissues are elastic which helps them return to their original length.LigamentsLigaments join bone to bone by inserting directly into the bone of the periosteum. Ligaments comprise fibers that are arranged in various directions. The major constituent in ligaments is the protein collagen and is very strong. The ligaments plan a major role in the stability of a joint. The arrangement of the ligaments varies accor ding to the joint and the degree of mobility within the joint. In joints with greater mobility and larger ranges of motion there are usually multiple ligaments. The knee is a nice example in that its mobility necessitates four ligaments. This arrangement allows for a high degree of mobility while also maintaining its stability.Joint Problems and InjuriesThe basic shape of joints and they way they functions makes them prime targets for injuries. Some injuries are mild like a sprain or slight hyperextension while others are much more severe like shoulder dislocations or torn anterior cruciate ligaments. Sprains basically are a stretch of the ligaments and are usually very painful although not serious. While many joint injuries heal on their own, many do not and require either surgery or medications. Common joint injuries include the sprains and strains but also tennis elbow or nursemaids elbow. Nursemaids elbow occurs when the radius (one of the bones in the forearm) slips out of plac e from where it normally attaches to the elbow joint. It is a common condition in children younger than 4 years of age. It is also called pulled elbow, slipped elbow, or toddler elbow. The medical term for nursemaids elbow is radial head subluxation. A sudden force or traction on the hand or forearm causes nursemaids elbow. This causes the radius to slip out of the ligament retentiveness it into the elbow. It can occur when an infant rolls himself or herself over, from a fall or from pulling, or swinging a young child by the hand. tennis elbow is also a very common injury and contrary to popular belief doesnt just result from playing tennis. Tennis elbow is a clamant stress injury of the elbow that occurs when the muscles and tendons in the elbow area are torn or damaged. Tennis elbow is usually caused by repetitive activities that strain the tendons in the elbow area, such as using a manual screwdriver, using a hammer, gripping something repeatedly or of course hitting backhand stroke in tennis. These types of injuries are usually acute and be treated effectively within a few days. Other conditions like arthritis are more chronic and require more long term treatment. more than joint soreness is caused by some sort of inflammation and the biggest cause of joint soreness in humans is arthritis which can affect any joint in the body. Arthritis is basically an inflammation of any joint in the body. Perhaps you have noticed that you are a little more stiff and check when you get out of bed in the morning. Although we dont always feel it, arthritis is pretty much present in every person. As it develops it causes pain in the joints with movement especially after periods of inactivity. It is estimated to affect about 10% of the worlds population and 14% of the US population and is suggested as the leading cause of disability in peck over 50 years old. There are many types of arthritis but the most common is likely osteoarthritis (OA). OA affects articular cart ilage and results from the breakdown of the joint capsule and loss of synovial fluid. This means bones can end up rubbing together which cause pain an inflammation. However, it is not just the joint capsule per se that is involved but also the ligaments, tendons and muscles. It has long been maintained that repetitive stresses caused arthritis but that is not always the case as we know that people who exercise regularly do not develop as much arthritis. It appears to be more due to trauma, age and infection.SummaryIn chapter six we provided a brief introduction of the general skeleton but paying particular attention to the role and classifications of articulations (or joints). We have learned that although there are many, many types of joints there are three basic classifications, namely, synovial, fibrous, and cartilaginous. The joints are classified according to their structure and also how much movement they allow. The joints that we are interested in the most in kinesiology are really the synovial joints. They are what permit the greatest range of motion. The structure of these joints is highly dependent upon synovial fluid which is a highly fluid lubricating substance permitting smooth movement. Joints vary in their range of motion whereby some joints do not allow any movement and some allow movement in all three cardinal planes. As a general rule, the more planes of movement a joint can move through, the less stable the joint, and the more likely we are to injure it. The shoulder joint is a nice example of this relationship. Ligaments are also present in joints and they play a varying role in the stability of a joint. Ligaments join bone to bone and are highly tensile structures. Generally, we mold a greater arrangement of ligaments in joints with greater ranges of motion.Research noteYou whitethorn have noticed that women often become more flexible when they are pregnant. Naturally, this is to prepare for the action of childbirth and labor. However, f or this increased flexibility to occur there needs to be structural changes in the joint structure. This is negotiate by changes in hormones such as estrogen and progesterone. But there is another not so common hormone, relaxin, which increases and acts to improve mobility in the symphysis pubis, allowing them to stretch more. Although this action is most pronounced in the symphysis pubis, the hormone can act on all connective tissue in the body. However, while this is beneficial, it can also be problematic as this increased flexibility can cause injury such as back pain, or in worse cases torn ligaments during a fall. For the most part the hormone levels are restored to normal levels shortly after delivery.Can you now answer the following questions related to joints and joint structure? cross off between a fibrous joint, a cartilaginous joint, and a synovial joint2. Can you identify which of the synovial joints havea. 3 degrees of freedom?b. 2 degrees of freedom?c. 1 degree of fre edom?3. In your own words describe the 3 major classifications of joints and give two examples for each classification (if possible). Also write the synonym for the terms below.a. Synarthrodial joint?b. Amphiarthrodial joint?c. Diarthrodial joint?d. Synostosis?Can you list a motion/action that is allowed for each of the six diarthrodial joints5. Identify 5 primary functions of the skeleton6. Starting with the neck and running(a) downwards, classify each joint.NeckShoulderElbowWristFingers (not thumb)ThumbTrunk (bottom of spine)Hiparticulatio genusAnkle7. Identify the type of joint shown below and then identify, where possible, two locations where one may find that type of joint on your bodyInsert a picture of 6 diarthrodial joints