Musculoskeletal Mushkies Flashcards
Hip examination?
- Look
- Feel
- Move
- Special Tests
- Completion
Hip exam look?
- Gait = antalgic, trendelenberg
- Standing = skin, shape, deformity
- Trendelenberg test
- Supine
Antalgic gait?
Reduced stance phase on affected side
Trendelenberg gait?
Sideways lurch of trunk to bring body weight over limb
Hip exam standing inspection?
- Skin = scars, bruising, erythema
- Shape = soft tissue/bony swelling, muscle wasting
- Deformity = coxa vara or valga
Trendelenberg test?
The sound side sags
- Negative = pelvis tilts up slightly on unsupported side
- Positive = pelvis drops on unsupported side (pathology of contralateral abductor mechanism)
Hip supine look?
Square the pelvis and measure leg length
- True length = ASIS to medial malleolus
- Apparent length = xiphisternum to medial malleolus
- Galeazzi test = tibial vs. femoral shortening
Hip examination feel?
- Palpate for tenderness
- ASIS, iliac crests and pubic rami
- Greater trochanter
Hip examination move?
- Abduction
- Adduction
- Flexion
- Internal rotation
- External rotation
Normal hip abduction?
45 degrees
Normal hip adduction?
30 degrees
Normal hip flexion?
130 degrees
Normal hip internal rotation?
20 degrees
Normal hip external rotation?
45 degrees
Hip examination special test?
Thomas’ test
Thomas’ test?
- Tests for fixed flexion deformity
- Masked by compensatory movement in pelvis or lumbar spine
- Obliterate lumbar lordosis
- Angle between thigh and bed = fixed flexion deformity
Completion of hip examination?
- Examine the knee and spine
- Perform a neurovascular assessment, esp. pulses
- AP and lateral radiographs of the pelvis
Causes of +ive trendelenberg test?
ASS
- Abductor wasting secondary to chronic pain
- Superior gluteal nerve injury = surgery
- Structural = DDH
True shortening of the leg causes?
- NOF
- Hip dislocation
- Growth disturbance of tibia/fibula e.g. fractures/osteomyelitis
- Surgery e.g. THR
- SUFE
- Perthes disease
Apparent shortening of the leg cause?
Scoliosis of the spine
Where is hip pain felt?
- Usually in groin or anterior thigh
2. Pain at back of hip is usually referred from lumbar spine
Causes of fixed flexion deformity?
- Osteoarthritis
2. NOF
Features of OA in the Hip?
- Trendelenberg gait
- Positive trendelenberg test
- Pain
- Stiffness
- Reduced ROM esp. internal rotation
- Fixed flexion deformity
Knee examination?
- Look
- Feel
- Move
- Special tests
- Completion
Knee examination look?
- Gait
- Standing
- Supine
Knee examination gaits?
- Antalgic
- Stiff = pelvis rises during swing phase
- Varus thrust = medial collateral
- Valgus thrust = lateral collateral
Knee examination standing examination?
- Skin = scars, bruising erythema
- Shape = swelling, muscle wasting (quads, hamstring)
- Deformity = genu varus/valgus
Knee examination scars?
- Arthroscopic ports
- KR
- Menisectomy
Popliteal fossa swelling?
Baker’s cyst
Where to measure quadriceps circumference?
15cm from tibial tuberosity
Knee examination feel?
- Temperature
- Effusion = sweep test and ballot
- Palpate
Knee examination palpation?
- Position knees at 90 degrees
- Joint line for tenderness = meniscal pathology
- Patella, tendon, and tibial tuberosity
- Popliteal fossa
Knee examination move?
- Straight leg raise = extensor lag, hyperextension, fixed flexion deformity
- Passive flexion of knee while palpating joint for crepitus
- Normal range = 0-140
Knee examination special tests?
- Cruciate ligaments = anterior + posterior drawer tests, Lachmann’s
- Collateral ligaments
- Menisci tests = McMurray test, Apley grind test
Lachmann’s?
ACL, more sensitive than anterior drawer test
Collateral ligament test?
- In partial flexion (30) and full extension
- Valgus stress = medial ligament
- Varus stress = lateral ligament
Knee examination completion?
- Examine hip and ankle
- Perform neurovascular assessment
- Standing AP and lateral and skyline radiographs of the knee
Causes of knee effusion?
- Synovial fluid = synovitis
- Blood
- Pus = septic arthritis
Cause of bloody knee effusion?
- 90% = ACL rupture
- PCL rupture, intra-articular fracture, meniscal tear
- Bleeding diatheses
Osteoarthritis defn?
Degenerative joint disorder in which there is progressive loss of hyaline cartilage, and new bone formation at the joint surface and its margin
Aetiology of osteoarthritis?
- Age
- Obesity
- Joint abnormality
Classification of osteoarthritis?
- Primary = no underlying abnormality
2. Secondary = obesity, joint abnormality
Main osteoarthritis joints?
- Knees
- Hips
- DIPs
- PIPs
- Thumb CMC
Osteoarthritis symptoms?
Pain, Stiffness, Deformity, Reduced ROM
Osteoarthritis pain?
- Worse with movement
- Background rest/night pain
- Worse at end of the day
OA stiffness?
- Esp. after rest (joint ‘gelling’)
2. Lasts 30 mins (e.g. AM)
Deformity?
Genu varus
OA vs. RA –> valgus or varus?
- OA = varus
2. RA = valgus
Pathophysiology of osteoarthritis?
- Softening of articular cartilage –> fraying and fissuring of smooth surface –> underlying bone exposure
- Subchondral bone becomes sclerotic with cysts
- Proliferation and ossification of cartilage in unstressed areas –> osteophytes
- Capsular fibrosis –> stiff joints
OA Ix?
- Bedside = examination
- Bloods = exclude Rh (FBC, ESR, RF, ANA), check renal function (for NSAIDS)
- Imaging XRAY –> LOSSD
OA Mx?
- MDT = GP, physio, OT, dietician, orthopod
- Conservative = lifestyle (weight, exercise), physio (muscle strengthening), OT (walking aids, footwear, home mods)
- Medical
- Surgical
OA Medical Mx?
- Analgesia = paracetamol, NSAIDs, tramadol
2. Joint injection = LA and steroids
OA Surgical Mx?
- Arthroscopic washout = mainly knees, trim cartilage, remove loose bodies
- Realignment osteotomy = small area of bone cut, useful in younger pts (<50) with medial knee OA, high tibial valgus osteotomy redistributes weight to lateral part of joint
- Arthroplasty = replacement
- Arthrodesis = last resort for pain Mx
- Novel techniques = autologous chondrocyte implantation
Differences between OA and RA classification?
- Pathology
- Clinical
- Radiology
OA vs. RA pathology?
- OA = degenerative, negative serology
2. RA = inflammatory, positive serology
OA vs. RA clinical differences?
- OA = asymmetric, large joints, AM stiffness <30m, worse PM, hands = PIPJ and DIPJ, no extra-articular fx
- RA = symmetric, small joints, AM stiffness >1hr, worse AM, hands = PIPJ and MCPJs, extra-araticular fx
OA vs. RA radiology differences?
- OA = LOSS, mild deformity
2. RA = Periarticular osteopenia and erosions, soft tissue swelling, severe deformity
Who pioneered hip arthroplasty?
Sit John Charnley in the 1960s
Types of hip arthroplasty?
- THR
- Hemiarthroplasty
- Rsurfacing
THR fx?
- Replace femoral head, neck and acetabulum
2. Usually elective
Hemi-arthroplasty fx?
- Replace femoral head and neck onlu
2. May be uni or bipolar
Resurfacing fx?
Replacement of surface of femoral head
Types of hip arthroplasty prostheses?
- Cemented = e.g. Thompson, recommended by NICE
2. Uncemented = e.g. Austin-Moore, may be useful in younger pts, easier to revise
Hip arthroplasty techniques?
- Posterior approach
2. Anterolateral approach
Posterior approach for hip arthroplasty fx?
- Access joint and capsule posteriorly, reflecting of the short external rotators
- Gives good access
- May have a higher dislocation rade
- Sciatic nerve may be injured –> foot drop
Anterolateral approach for hip arthroplasty fx?
- Incision over greater trochanter, dividing fascia lata
- Abductors are reflected to access joint capsule
- May have lower dislocation rate
- Superior gluteal nerve may be injured –> trendelenberg gait
Complications of hip arthroplasty?
- Immediate
- Early
- Late
Immediate complications of hip arthroplasty?
- Nerve injury
- Fracture
- Cement reaction
Early complications of hip arthroplasty?
3Ds
- DVT = up to 50^ w/o prophylaxis
- Deep infection = must remove metalwork before revision
- Dislocation (3%)
Late complications of hip arthroplasty?
- Loosening = septic/aseptic
- Leg length discrepancy
- Metalosis
- Revision = most replacements last 10-15 years
Metalosis?
Medical condition involving deposition and build-up of metal debris in the soft tissues of the body, hypothesized to occur when metallic components in medical implants, specifically joint replacements, abrade against one another.
Commonest complications of THR?
DVT
Peak incidence of DVT post THR?
5-10d post op
DVT prophylaxis for THR classification?
- Pre-op
- Intra-op
- Post-op
Pre-op DVT prevention?
- TED stocking
- Aggressive optimisation e.g. hydration
- Stop OCP
Intra-op DVT prevention?
- Minimise length of surgery
2. Use pneumatic compression boots
Post-op DVT prevention?
- LMWH
- Early mobilisation
- Good analgesia
- Physio
- Adequate hydration
Hip resurfacing indications?
May be used in young (<65y/o), active people who are expected to outlive the replacement
Hip resurfacing advantages?
- Metal on metal bearing weigh less
- Larger head –> less dislocation and more stability
- Preserve bone stock, making revision easier
Hip resurfacing disadvantages?
- Cobalt and chromium metal ion release may cause pathology e.g. leukaemia
- Risk of NOF if mal-positioned
Types of knee arthroplasty?
- Cemented = UK
- Uncemented = Europe
- Can be uni/bicompartmental
Primary aim of knee arthroplasty?
Reduce pain
Knee arthroplasty procedure?
- Performed under tourniquet
- PCL is usually preserved
- ACL is usually sacrificed (prosthesis is specifically designed to provide some compensation for this)
- Metal prosthesis and an ethylene articular disc
- Patellar surface can be re-surfaced
- Knee bending after 2-3 days
- 10 days hospital stay
Complications of knee arthroplasty?
- Immediate
- Early
- Late
Immediate complications of knee arthroplasty?
- Nerve injury = peroneal nerve (1%, foot drop)
- Vascular injury = SFA, popliteal and genicular vessels
- Fracture
- Cement reaction
Early complications of knee arthroplasty?
3 Ds
- DVT
- Deep infection
- Dislocation
Late complications of knee arthroplasty?
- Loosening = septic or aseptic
- Periprosthetic fractures
- Reduced ROM and instability (loss of ACL)
Surgical Mx of RA in the knee?
- Indicated in failed medical Mx
- Synovectomy and debridement (can be done arthroscopically)
- Removal of pannus and cartilage
- Supracondylar osteotomy
- TKR
DDx of haemarthrosis?
Primary or Secondary
Primary cause of haemarthrosis?
Without trauma –> bleeding diatheses