A chronic, degenerative joint disease characterised by the breakdown of articular cartilage and usually affects one or two synovial joints. As the hyaline cartilage breaks down it no longer acts as a cushion to protect the bone. This causes friction in the joint, swelling in the synovial membrane, and the growth of bony spikes, resulting in painful, stiff, tender, and inflamed joints. Most affected joints are weightbearing - hips, knees, shoulders, and elbows.
One of the most common forms of arthritis in dogs, normally seen in middle aged to senior dogs, but also affect young dogs with poor breeding and malformed joints. As it progresses it worsens, pain and inflammation increases and joint mobility becomes more restricted due to bone growth and friction every time the joint moves. Overproduction of synovial fluid causes swelling, putting more pressure on the joint and ligaments, and overcompensation in other muscles. The muscles will begin to protective splint and accrue massive stresses causing myofascial pain and trigger points.
Symptoms
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A developmental condition that is caused by an abnormality in the formation of the hip joint. The femoral head should fit smoothly into the acetabulum, but the malformation in either the femoral head, acetabulum or both result in uneven contact in the joint surface causing instability. It can affect one or both hip joints in any dog, and affects males and females equally.
The primary cause is genetics, as it is a hereditary disease, but it is also affected by diet, growth rate, environment, exercise, and muscle mass. Managing external factors can help control the progression of the disease. It is a progressive, painful lifelong condition causing pain, swelling and inflammation. The unstable joint causes gradual bone degeneration, articular cartilage to be eroded, the capsule and ligament become stretched, and it leads to Osteoarthritis. It can also be the result of injury, and later onset of the condition can be caused by Osteoarthritis. Careful management is required and some dogs will require surgery.
Clinical signs vary, and it can go undetected for many years, but usually shows around 5-6 months, and is most diagnosed between 6-12 months. Symptoms get worse with ageing and vary depending on the severity of the disease, inflammation, looseness in the joint and how long the dog has been suffering.
Symptoms
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The most common cause of lameness in the front legs, it relates to the abnormal development during growth of the elbow joint where the humerus, ulna and radius do not fit together perfectly. This affects articulation of the joint due to abnormal concentration of forces which affect the growth of cartilage and results in microscopic stress fractures.
It normally affects both front limbs and can occur in any dog. It is an inherited condition and the cause is unclear and often affects younger dogs, and is more common in large and giant breeds. The cause may be multifactorial and affected by genetics, rapid growth in young dogs, defects in cartilage growth, trauma, overexercise, and diet. Once the elbow joint is damaged it causes osteoarthritis, inflammation, and cartilage loss, all resulting in pain and loss of function. The pressure in the joint can also lead to fractures and surgery is often recommended. Medial compartment disease has the worst prognosis as the degeneration of the articulating joint surface causes bone to be exposed and cartilage to be eroded. It causes pain and inflammation and cannot be reversed.
Often diagnosed at an early age at around 4-6 months, but in some dogs, it is later at around 4-6 years. Occasionally there are no signs.
Typical Symptoms
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A common orthopaedic disease, also known as slipping kneecap, which affects the hindlimbs. It occurs when the patella (kneecap) moves from its normal position and dislocates outside of the trochlea groove which stabilises it, enabling it to move medially (slips inward), laterally (slips outward) or in both directions. It can affect one or both legs and prevents the leg from being able to flex properly.
Female dogs are more prone to it, with medial luxation being most common in small breeds under 3 years, especially toy and miniature breeds and dogs with a ‘bow-legged’ stance. Lateral luxation is less common and is commonly diagnosed in large breeds.
There are 4 grades of luxating patella:
GRADE 1 – Patella luxates then returns to normal position
GRADE 2 – Patella luxates when stifle flexes but returns to normal when stifle is extended
GRADE 3 – Patella is luxated for majority of the time
GRADE 4 – Patella is permanently luxated
Symptoms often start to show in young puppies around 4 months old, but if caused by injury symptoms can be displayed at any age. One of the first signs is hopping/skipping when the hind leg is active with no signs of pain, the dog will limp for a few steps then return to normal.
Symptoms
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A chronic, non-inflammatory, degenerative joint disease which causes abnormal bone growth on the outer edges of the spinal vertebrae. The narrowing of intervertebral discs causes growths to form and the spine to fuse together, restricting spinal mobility. It can be found in one or more locations and in dogs it is common in the thoracic (especially between the rib cage and abdomen) and lumbar vertebra and lumbosacral joint (around hips and back legs). Large breeds are more predisposed to it, and it is more common in middle aged and older dogs around 9 or 10 years old.
Ageing, injury (especially spinal trauma), genetic predisposition, repeated pressure from activity, or other conditions which de-stabilise the spinal column, such as Intervertebral disc disease, cause the vertebral bones and joints to degenerate and become unstable. It is also common in neutered female dogs with excessive scarring as this weakens the core muscles. To re-establish stability and reinforce weakened joints, bony spurs, called osteophytes, form at the endplates.
It is a progressive condition and cannot be cured. As the disease progresses the bony spurs may bridge from one vertebra to another, attach or insert themselves into neck bones, and touch nerves in the spinal region resulting in increased pain, and reduced range of motion and flexibility.
Symptoms
Most dogs are asymptomatic, but as it progresses and spinal fusion occurs, symptoms become more noticeable:
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A painful inflammatory condition that occurs in joints when cartilage is damaged or grows abnormally and becomes partially detached or separates completely from underlying bone. This causes fluid build-up in the joint and it becomes inflamed, swollen and nerves become irritated. It is a developmental disease occurring during growth, when the process of endochondral ossification is taking place, and is a result of an abnormality in the cartilage to bone transformation. The cartilage is abnormally thick making it less resistant to mechanical stress and results in lesions ranging in severity.
There are four grades:
Grade 1 – is an intact lesion with no signs of separation
Grade 2 – shows early signs of separation from articular cartilage and underlying bone
Grade 3 – is a partially attached lesion
Grade 4 – is a lesion with a crater and a loose body floating in the joint (called a Joint mouse)
It can affect any joint and may be bilateral or affect several joints. It is more common in the shoulder, elbow, hock and stifle, but rarely seen in the spine or wrist.
Clinical signs can vary depending on the size of the cartilage defect, which joint is affected, and severity of the lesion, and in some cases are asymptomatic. Symptoms are usually evident before 1 year old, around 4-7 months, but occasionally (especially with Shoulder OCD) they may present when the dog is older.
Typical Symptoms
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A sprain is a soft tissue injury caused by the overstretching or tearing of ligaments around a joint. It occurs when the joint twists or wrenches in an unnatural position causing attachments to become stressed beyond their normal capacity and results in joint or muscle pain, swelling and bruising around the area and reduced joint mobility. It is a common injury and the most affected areas in dogs are the stifle, hock, toes and wrist (carpus). Due to limited blood supply the healing process is slow and results in the formation of inferior scar tissue, this can weaken the joint and result in repeat injury. It is important to protect the area whilst the tissue heals but also keep it moving to increase circulation as this promotes healing. There are various grades of sprain, and these affect the rehabilitation process.
There are 4 degrees of sprain:
Symptoms
These can vary depending on the severity of the sprain and can go from hardly noticeable to crippling.
Muscle strain, sometimes referred to as a pulled muscle or torn muscle, describes a partial or complete tear in the muscle and can occur in any part of the muscle structure including tendons and blood vessels. Damage occurs to the muscle fibres, and/or it’s tendon, when the muscle is overstretched, twisted, or contracted too quickly. This causes tension on the muscle whilst it is contracting, such as a sudden jerk or twist or when there is excessive loading on the muscle. Acute strains happen fast, often during activities that require explosive movements, such as jumping, sudden changes in direction or speed, or falling awkwardly. Chronic strains occur due to overuse, often during activities which have repetitive or prolonged movements, such as walking on slippery laminate flooring.
There are 3 categories of strain depending on the severity of the rupture and how many muscle fibres are affected, and these gradings can provide an idea of how long recovery may take.
Symptoms
Trigger points cause the most common muscular issues for dogs and are often referred to as ‘knots’. They are found in the muscle tissue or fascia and are hyper irritable points in taut bands of skeletal muscle. When muscle fibres become dysfunctional and stay in a contracted state, the muscle cannot relax and a tight band forms in the muscle. Supply of blood and oxygen is restricted, and waste products accumulate. It is the point where the waste accumulates, that is called the trigger point. They cause the muscle to be weaker, decrease contractile range and create tension where the muscle attaches to bones and other tissues. They are also commonly found alongside injuries such as sprains, strains and orthopaedic conditions.
The main causes are:
Trigger points can vary in shape and size and are extremely tender, causing pain when compressed. The pain can cause discomfort and extreme or debilitating chronic pain which can be localised or cause predictable patterns of referred pain elsewhere in the body. As dogs are good at hiding pain, and the pain often mimics other conditions, including arthritis, the dog can suffer for a long time and trigger points are often missed as being the source of pain.
Typical Symptoms
There are different types of trigger point that have different qualities, and which are classified based on symptoms and location:
Massage which includes deep tissue work, trigger point therapy and myofascial release can reduce pain and discomfort, resulting in a significant improvement of flexibility and movement. Some trigger points will be completely resolved, however, if it has been in the body for a long time, permanent damage to the tissue will have occurred, which means that the dog will only get a temporary release and ongoing treatment will be needed to reduce reactivity.
Myofascial Pain is a common condition which can be defined as having the presence of multiple sensitive trigger points in the fascia or surrounding muscle which are caused by inflammation or irritation, and which cause chronic pain in the musculoskeletal system. There are various causes including:
Myofascial pain relates to pain in the muscles which is caused by the fascia that is surrounding it. The pain comes from trigger points which are sensitive areas in the muscles caused my taut bands of highly irritable muscles fibres which feel like small bumps, nodules or knots. They occur due to an excess of acetylcholine and calcium which leads to a lack of oxygen, causing blood flow to stop and the muscle tissue becoming hypercontracted, which results in an accumulation of waste materials. Muscles require oxygen to relax, but as there is a lack of it due to tightness and restricted blood flow, it can't reach the muscle, so it can't relax and heal, and it becomes a self perpetuating problem. This causes the trigger points to become irritated and sends pain signals to the brain to stop using the muscle, which means that surrounding muscles have to work harder to compensate. As fascia is continuous, a restriction in one part can affect another which can lead to many muscles being affected at the same time. Diagnosis of myofascial pain is often difficult because the pain is diffused and not easy to localise. It also mimics other conditions such as Arthritis and Fibromyalgia and symptoms can vary from dog to dog depending on severity and tenderness. In addition it is not possible to use MRI scans or X-rays as fascia does not show up in them.
Dogs with Myofascial Pain may exhibit one or more of the following symptoms:
Myofascial Pain can cause unrelenting pain and discomfort and can gradually worsen if it is not treated. Massage therapy can address trigger points and help increase blood flow to the hypercontracted muscle tissue, supplying it with fresh oxygen which helps muscles to relax and stop contracting and help to end the Pain Cycle.
A hypertonic muscle is a muscle that has too much resting tone that causes extreme tightness. Golgi tendon organs are responsible for sensing muscle tension and switching muscle activity on or off. When the muscle is tight, they become overstimulated, and the signals sent through the nervous system become disturbed causing the muscle to be contracted even though there is no movement.
There are various reasons for hypertonicity occurring:
As the muscle cannot relax, it cannot recuperate and becomes fatigued. They also become hard and inflexible and may bulge which further impedes its ability to contract. The fascia also begins to tighten adding to further restriction and making the muscle prone to trigger points. These factors cause the muscle to become locked in a pain cycle, so the muscle will be tender, have dull aching pain and nerve irritation. As the muscle is rigid, there is loss of function and normal movement becomes more difficult, walking may be stiff, jerky and uncoordinated. The dog may also experience cramps and is more susceptible to tearing or straining the muscle. As the contracted muscle may be long or short, posture is also affected
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