osteoarthritis - university of pretoria · osteoarthritis of the dip joints. this patient has the...
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Osteoarthritis
Dr. C. C. Visser
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Constituents of hyaline cartilage
• Chondrocytes• Matrix (extracellular material)
– Collagen fibres– Proteoglycan molecules
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Collagen
• Sheets of fibres• Provides shear resistance• Orientation:
– Vertically from bone upward– Change direction at surface to run parallel with
surface
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Proteoglycans
• Large hygroscopic molecules
• Long central chain of hyaluronic acid
• Numerous side chains alongs its length, each with– Central cores of protein– Chondroitin sulphate and keratan sulphate side chains
• Pg’s attract water and put collagen under tension
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Normal articular cartilage. The swelling pressure of the fully hydrated but compressed aggrecans is counterbalanced by the tight collagen network. Due to this unique composite structure, healthy articular cartilage can resist major pressure and shear forces
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Macroscopic changes 1
• Softening and swelling of cartilage
– Rupture of collagen fibres
– More water is absorbed by proteoglycans
– Cartilage is considerably weakened
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Osteoarthritic articularcartilage. Damaged or ruptured collagen fibers lead to swelling of the now less compressed aggrecans. The cartilage becomes softer, the pressure and shear resistance is diminished, which leads to further damage to the collagen network.
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Macroscopic changes 2
• Fibrillation– Fine flakes of superficial cartilage become
loosened and flake off (and cause mild secondary synovitis which can lead to ‘cold’effusions)
– Cracks appear in cartilage: eventually run through full thickness of cartilage
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Arthroscopicappearances in OA of the knee joint:fibrillated surface of the cartilage on the medial femoralcondyle with minormeniscal damage
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Macroscopic changes 3
• Erosion of cartilage– Progressive loss of cartilage
– Ultimate loss of full thickness of cartilage
– Exposed bone becomes very hard with a polished appearance: ‘eburnation’ of bone (looks like ivory)
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Gross superior view of a femoral head from a patient with radiographic stage IOA. This shows an area of complete cartilage loss, with polishing oreburnation of the underlying bone.
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A portion of theeburnated surface of an osteoarthritic joint. This demontrates focal superficial bone and bone marrow necrosis, which is seen macroscopically as theopaque yellow area on the left.
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Right: Early OA with area of cartilage loss in the center.
Left: More advanced changes with extensive cartilage loss and exposed underlying bone
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Macroscopic changes 4
• Synovial effusions due to synovitis
– Joint effusions: usually small and ‘cold’
– Subchondral cysts: Fluid is forced through clefts in cartilage into the underlying bone, which can be seen on X-ray
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An area of cystic degeneration in thesubchondral bone of the superior surface of a femoral head. Note the large flatosteophyte on the medial surface.
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Macroscopic changes 5
• Osteoblastic stimulation (repair attempt)
– Underneath the damaged cartilage: subchondral sclerosis on X-ray
– Around edge of joint forming lip of bone: fibro-osseus osteophytes
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Macroscopic changes: Summary
• Softening and swelling• Fibrillation• Full thickness cracks• Eburnation• Subchondral cysts• Subchondral sclerosis• Osteophyte formation
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Epidemiology
• Most common disease of joints over age 65 radiologically (correlates poorly with symptoms)
• Rapid increase in radiologic evidence of OA after age 40
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Individual risk factors for development of OA
• Obesity: knee > Hip• Family history (genetic): polyarticular esp
hands• Trauma• Hypermobility• Dysplasia: Hip and knee • Occupation and sport: excessive and
repeated loading of a joint
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Clinical features 1• Pain and tenderness
– Usually slow onset of discomfort, with gradual and intermitent increase
– Poor correlation between symptoms and radiologic findings
– Diffuse/ sharp and stabbing local pain
– Originates in joint /periarticular soft tissue
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Clinical features • Pain and tenderness (cont)
– Types of pain
• Mechanical: increases with use of the joint
• Inflammatory phases
• Rest pain later on in 50%
• Night pain in 30% later on
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Clinical features 2• Movement abnormalities
– ‘Gelling’: stiffness after periods of inactivity, passes over within minutes of using joint again
– Coarse crepitus: palpate/hear
– Reduced ROM: capsular thickening and bony changes in joint
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Clinical features 3
• Deformities– Soft tissue swelling:
• mild synovitis • small effusions
– Osteophytes– Joint laxity– Asymmetrical joint destruction leading to
angulation
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Osteoarthritis of the DIP joints. This patient has the typical clinical findings of advanced OA of the DIP joints, including large firm swellings (Heberden’snodes), some of which are tender and red due to associated inflammation of the periarticular tissues as well as the joint.
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Knee joint effusion
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A patient with typical OA of the knees. In the normal standing posture there is a mildvarus angulation of the knee joints due to symmetrical OA of the medial tibiofemoralcompartments.
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Pseudolaxity due to cartilage loss. The joint is not loaded in the first photograph
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Unstable distalinterphalangeal joints in OA. The examiner is able to push the joint from side to side due to gross instability, a common finding in lateinterphalangeal joint OA.
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Clinical patterns of involvement
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OA of the knees can affect any combination of the three main compartments of each knee. It is usually symmetrical, and the compartments most frequently involved are the medial tibiofemoraland patellofemoralcompartments.
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Distribution of OA of the hip joint. OA can maximally affect the superior pole, inferior pole, posterior part or other segments of the hip joint. Superior pole involvement, with a tendency for the head of the femur to sublux superolaterally, is the commonest pattern. Involvement of the whole joint (concentric OA) is relatively uncommon.
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Special Investigations
• Blood tests: Normal
• Radiological features:– Cartilage loss– Subchondral sclerosis– Cysts– Osteophytes
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Extensive OA with complete loss of the joint space in a concentric pattern and subchondralbone destruction.
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Evolution of erosive OA of the IP. Paired X-rays 3 years apart. One joint has progressed, one has shown evidence of healing and one has fused. This indicates the whole range of changes that can occur.
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Management
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Treatment Principles
• Education• Physiotherapy
– Exercise program– Pain relief modalities
• Aids and appliances• Medical Treatment• Surgical Treatment
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Education
• Nonsystemic nature of disease• Prevent overloading of joint. Obesity!!• Appropriate use of treatment modalities
– Importance of exercise program– Aids, apliances, braces– Medial treatments– Surgical treatments
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Exercise
• Will not ‘wear the joint out’
• Important for cartilage nutrition
• Some evidence that lack of exercise leads to progression of OA
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Exercise
• Encourage full range low impact movements eg swimming, cycling
• Avoid– Prolonged loading– Activities that cause pain– Contact sports– High impact sports eg running
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Quadriceps exercises for knee OA. Quadriceps exercises are of proven value for pain relief and improving function, and everyone with knee OA should be taught the correct techniques and encouraged to make these exercises a lifetime habit. There is a weight on the ankle.
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Use of transcutaneousnerve stimulation (TENS) as an adjunct to other therapy for pain relief at the knee joint. The use of acupuncture, TENS and other local techniques to aid pain relief in difficult cases of OA is often worthwhile.
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Aids and appliances
• Braces / splints• Special shoes/insoles• Mobility aids• Aids: dressing, reaching, tap openers,
kitchen aids• Taping of patella in patello femoral OA
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Use of a cane, stick or other walking aid. This patient, who has hip OA, has found that she can reduce the pain in her damaged left hip by leaning on the stick in the right hand as she walks. The reduction in loading can be huge, and the effect on symptoms and confidence with walking very beneficial.
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The use of shoes and insoles to reduce impact loading on lower limb joints. Modern sports shoes (‘trainers’) often have appropriate insoles. Alternatively, special heel or shoe insoles ofsorbithane or viscoelasticmaterials can be used. They may help relieve pain as well as reducing the peak impact load on the joints during walking.
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Medical Treatment
• Simple analgesics: paracetamol, low dose ibuprofen: PRN or regular
• NSAID’s/Coxibs PRN regular• Intra-articular corticosteroids• Topical treatment eg NSAID creams,
capsaicin• ‘Chondroprotective agents’
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A patient with OA of thecarpometacarpal joint of the left thumb undergoingarthrocentesis for injection of a depot corticosteroidpreparation. The operator is distracting the patient’s thumb to open up the joint space.
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Joint replacement surgery
• Indications: pain affecting work, sleep, walking and leisure activities
• Complications– sepsis– loosening– lifespan of materials (mechanical failure)
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