Orthopaedics Flashcards
Describe the pathophysiology of osteoarthritis
Synovial joints
Combination of genetics and overuse and injury
Imbalance between cartilage wearing down and chondrocytes repairing it, leading to strucural issues
List some risk factors of osteoarthritis
Age Obesity Occupation Trauma Female FH
List the joints commonly affected by osteoarthritis
Hips Knees Sacroiliac joints DIPs CMC of the thumb Wrist Cervical spine - spondylosis
List the 4 key X-ray changes of osteoarthritis
Loss of joint space
Osteophyte formation
Subchondral cysts
Subchondral sclerosis
How does osteoarthritis present
Joint pain
Stiffness - worsens with activity
Deformity - bulky, bony enlargement of the joint
Crepitus on movement
Effusions around the joint
Instability
Reduced function/range of movement of the joint
Describe the signs of osteoarthritis in the hands
Heberden's nodes - DIP Bouchards nodes - PIP Squaring at the base of thumb - CMC Weak grip Reduced ROM
When can OA be diagnosed
Patient >45
Typical symptoms with activity
No morning stiffness
How is osteoarthritis managed
Patient education
Lifestyle change - weight loss, physiotherapy, OT, orthotics
Analgesia - oral paracetamol and topical NSAIDs, oral NSAIDs (PPI), opiates (codeine), topical capsaicin, intra-articular injection, joint replacement
What is a hemiarthroplasty
Replacing one half of the joint
What is a total joint replacement
Replacing both articular surfaces of the joint
Which organism is most common in prosthetic joint infections
Staphylococcus aureus
List some risk factors for prosthetic joint infection
Prolonged op time
Obesity
Diabetes
What are some symptoms of prosthetic joint infection
Fever Pain Swelling Erythema Warm
How is a prosthetic joint infection diagnosed
Clinical finding
X-ray
Blood tests - Inflammatory markers and cultures
How is prosthetic joint infection managed
Antibiotics and surgery - Joint irrigation, debridement complete replacement
What is a compound fracture
Skin is broken and broken bone is exposed to air
What is a stable fracture
Sections of bone remain in alignment at the fracture
What is a pathological fracture
Bone breaks due to an abnormality within the bone
What is a salter-harris fracture
Growth plate fracture - occurs only in children
What is a Comminuted fracture
Breaking into multiple fragments
What is a compression fracture
Affects the vertebrae in the spine
Describe a Colle’s fracture
Transverse fracture of the distal radius
Causes the distal portion to displace posteriorly (upwards)
Causes a dinner fork deformity
Commonly a result of a fall onto outstretched hand
Describe a scaphoid fracture
Fall onto outstretched hand
Scaphoid is a carpal bone at the base of the thumb
Key sign - tenderness in the anatomical snuffbox (groove between tendons when you extend thumb)
Why is it important to spot scaphoid fractures
Scaphoid bone has retrograde blood supply with blood vessels supplying the bone from only one direction
Avascular necrosis and non-union if blood supply cut off