tuberculosis of hip joint
TRANSCRIPT
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TUBERCULOSIS OF HIPDR PARDEEP BANSALDR SULTHAN BASHA
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Historical aspects
ROBERT KOCH discovered Mycobacterium tuberculosis in 1882
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INTRODUCTION
OLDEST DISEASE OF HUMAN BEINGS TB HIP – 2ND ONLY TO SPINE SPINE:HIP RATIO – 10:7 OSTEOARTICULAR TB – 1-3% OF ALL TB
CASES ,OF WHICH TB HIP – 15-20% M>F AGE GROUP 20-30YRS
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CAUSATIVE ORGANISM MYCOBACTERIUM TUBERCULOSIS M/C HUMAN
PATHOGEN SIZE – 3X.3UM GRAM POSITIVE AFB HEMATOGENOUS DISSEMINATION FROM PRIMARY
FOCUS BONE AND JOINTS TB DEVELOP GENERALLY 2-3 YRS
AFTER PRIMARY FOCUS
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Pathogenesis & Pathology
Primary focus (Active/quiscent,Apparent/latent)
Hematogenous dissemination
2-3 yrs
Osteoarticular TB
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PATHOLOGY Infection of hip is secondary to some primary focus
either in lungs or mediastinal node or iliocaecal region and spread to hip by blood stream.
Initial focus may start in acetabular roof > epiphysis ( head ) > Metaphysis or neck ( Babcock triangle ) > greater trochanter . Rarely the disease may start in synovial membrane and may remain as synovitis for months.
When initial focus is acetabular roof -- joint involvement is late and severity of symptom is mild – by the time pt. report to hospital extensive destruction already present .
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TB of greater trochanter may involve the trochanteric
bursa without involving the hip for long time .
As the upper end of femur is entirely intracapsuler the joint get involve rapidly and disease become osteoarticular
Cold abcess in joint – perforate inferior weaker part of capsule rarely acetabular roof – cold abcess can present anywhere around the hip ( femoral triangle , medial ,post and lateral side of thigh ,ischeo – rectal fossa , pelvis )
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Cold Abscess Collection of products of liquefaction & reactive
exudation Contains - serum, leukocytes, caseous material, bone debris,TB bacilli Feels warm ,but temperature not raised as high as in
acute pyogenic infection Bursts Sinus/ulcer formation
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Cold abscess forms within the joint – inferior weaker part of the capsule
Perforated
Cold abscess presents anywhere around the hip – femoral triangle
Medial,lateral/ posterior aspect of thigh Ishcio rectal fossa Pelvis
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Intra pelvic abscess
Below the levator ani Above levator ani
Ischiorectal fossa Upwards into inguinal
region
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Common sites..
Initial focus may start in
1. Acetabular roof –m/c
2. Epiphysis/Femur Head
3. Metaphyseal region 4. Greater trochanter-
least common
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Types of Disease
CASEOUS EXUDATIVE More
destruction More exudation
& abscess formation
Insidious onset Marked
constitutional features
GRANULAR Less
destruction Abscess
formation rare Insidious
onset & course
DRY lesion
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Fate of tubercle Resolve completely Heal completely with residual deformities/ loss of
function Lesion completely walled off,caseous tissue –
calcified Low grade chronic fibromatous, granulating &
caseating lesion may persist Infection spreads – contiguous,systemically
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CLINICAL FEATURES Insidious in onset Pain and swelling in the hip and limping are the
usual presenting symptoms Sometimes there is referred pain in the knee and is
often misleading. Pain is maximum at end of day. Child may wake up
from sleep due to pain(night cry) Constitutional symptom like loss of appetite, loss of
weight, fever Limp is the earliest and commonest symptom
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Classification
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STAGES OF T.B. HIP
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Synovitis stage.. Position of max joint capacity – FABER Apparent LENTHENING Only extremes of movement are painful DD – Traumatic synovitis - Nonspecific Transient Synovitis - Low grade pyogenic infection - Perthes disease - SCFE USG repeated at 2-3 wks X-Rays: soft tissue sweling,Rarefaction
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Early Arthritis stage.. Articular damage starts Severe muscle spasm- FADIR Apparent shortening Restriction of movements in all directions Appreciable muscle wasting MRI – synovial effusion - minimal ares of bone destruction - osseous oedema X-Rays: OSTEOPENIA, marginal bony erosions NORMAL JOINT SPACE
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Advanced Arthritis .. FADIR True shortening severity of symptoms Capsule further dstroyed ,thickened & contracted X-Rays : Destruction of articular surface Joint space
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Advanced arthritis with Subluxation / Dislocation
With further destruction of acetabulum, femur head ,capsule & ligaments the upper end of femur is displaced upwards & dorsally in the wandering / migrating acetabulum leaving its lower part empty & broken – Pathological dislocation of femur head
Movements are grossly restricted
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CLASSIFICATION - RADIOLOGICAL APPEARENCE Shanmugasundaram in 1983 classified the radiological
appearences as 1. Type 1 - normal (C)2. Type 2 – Travelling/ wandering acetabulum(C,A)3. Type 3 – Dislocating type(C)4. Type 4 – Perthes type(C)5. Type 5 – Protrusio acetabuli(C,A)6. Type 6 – Atrophic(A)7. Type 7 – Mortar & Pestle type(C,A)
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Shanmugasundaram’s Classification
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PROTRUSIO TYPE ATROPHIC TYPE
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If the disease occurs during chilhood 1. Chronic hyperaemia Enlarged femoral head epi &
metaphysis COXA MAGNA2. Thrombo embolic phenomenon of selective terminal
vasculature changes similar to PERTHES disease
3. a)Gross blood supply of femoral head due to TE b) Rapidly developing tense IC effusion (Tamponade
effect)
reduced femoral head & neck size
COXA BREVA
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Restricted growth of epiphyseal plate & normal trochanteric growth plate COXA VARA
Restricted trochanteric growth & normal femoral head COXA VALGA
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Close relationship b/w radiological type & therapeutic outcome:
1. Normal type - 92% good results2. Perthes type - 80% good results3. Dislocating type – 50% good results4. Travelling acetabulum & Mortar pestle
type - 29% good results
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Evaluation Hematological – ESR,relative lymphocytosis Bacteriological –AFB staining & C/S Serological – ELISA –serum IgG,IgM Histology – HPE for ‘ TUBERCLE ‘ Molecular – PCR using 16sr RNA Clinico –radiological : X-Rays, CT Scan MRI USG
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Synovial fluid aspiration AFB positive in 10 – 20% of cases Cultures positive in 50% of cases Aspiration of cold abscess for microbiology Synovial Biopsy More reliable Cultures positive in 80% cases Histology : granulomatous inflammation
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Bacteriological diagnosis.. Specimen stained for AFB & C/S Stains used: - ZIEHL NEELSEN stain - Auramine Orange fluorescence Media used for growth: Lowenstein- Jensen Conventional AFB C/S – 4wks - requires live organism - long incubation period - low sensitivity in pts already on ATT Newer rapid culture tech- BACTEC
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BACTEC : Radiometric culture system
- Detects Mycobac as early as 7-14 days
- Based on release of radiolabelled CO2 from the growth of Mycobac in selective LIQUID media using C14labelled sustrate
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Diagnosis – Clinico radiological in endemic areas Paucibacillary Disease – Bacteriological diagnosis is
possible in 10-30% cases only HPE & PCR –diagnostic Emerging MDR strains – threat to cure the TB lesion ,
thus TB bacilli should be isolated & subjected to drug susceptibility
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Serology.. IgM – diagnostic of activity of the disease IgG – diagnostic of chronic disease/healed disease - levels remain high even after full Rx ELISA antibody values are dependent on - time of taking sample - state / phase of the disease Antibody titres donot correlate with recovery status
of the patient.
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Molecular diagnosis..
PCR – single test which amplifies the genome even if a single organism was present
Ideal for detection of paucibacillary TB case
Many target genes of Mycobacteria 16sr RNA – used as target sequence as it
is universally present false negative
- genus specific marker
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Advantages of PCR..1. Highly efficient & rapid method for Dx – 3days2. Great value in early Dx3. Very sensitive tech – could detect as few as 1-2
mycobac in the specimen , and Rx initiated based on this result if clinical signs of disease present
4. Can differentiate typical from atypical mycobac5. Requires very small quantity of specimen – even
microlitres of FN aspirate can be tested
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Disadvantages ..
Notable to differentiate live from dead org, as it is not dependent on bac replication
Doesnot tell about the activity of the disease
PCR positive results doesnot always confirm to culture results
PCR – not a substitute for culture
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Culture – gold standard CT guided FNAC – useful & minimally invasive
method of ascertaining HP Dx Screening tests : 1. Tuberculin skin test/Mantoux test2. Interferon gamma release assay (IGRA)
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Tuberculin skin test..
Purified protein derivative (PPD) of tuberculin (Antigenic culture extract) injected intradermally 0.1ml into volar / dorsal aspect of forearm(0.1ml = 0.0002mg PPD)
Results read after 48-72 hrs Positive : > 10mm induration Measures delated hypersensitivity
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Causes of false negative PPD test : 1. Age > 70 yrs2. Steroid use( Prednisolone >15mg/day)3. Hypoalbunemia(<2g/dl)4. Azotemia5. Impaired cellular immunity6. HIV infection
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IGRA..
Measures the release of IFN – Υ by mononuclear cells stimulated by specific M. Tuberculous antigens
Useful test for latent TB Good sensitivity & specificity Particularly helpful in distinguishing TB
from non tuberculous Mycobac
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Radiological ..
X-Rays USG CT – Scan MRI
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Management.. Early diagnosis , effective chemotherapy – vital to
save the joint Depends upon the stage of clinical presentation Rx includes : ATT Absolute bed rest Traction Excision Arthroplasty Arthrodesis THA
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Traction.. Prevents /Corrects the deformity Rest to the part Relieves muscle spasm Maintains joint space Minimises development of migration of acetabulum- B/L traction – if abduction deformity, to stabilise the
pelvis
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After 4-6 months of Rx – Ambulation with crutches / orthosis
Ambulation : - 1st 12 wks – non weight bearing- 2nd 12 wks – partial weight bearing Unprotected wt bearing – 18-24 months after onset
of Rx
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CATEGORY
TYPE OF PATIENT
REGIMENS
DURATION
1.New Cases
-New sputum smear +-Seriously ill ,sputum –ve-Seriously ill ,EP-Sputum negative-EP not seriously ill
2(HRZE)3 + 4(HR)3
6 MONTHS
2.Retreatment cases
-sputum positive relapse
-sputum positive failure-sputum positive treatment after default
-2(HRZES)3+ 1(HRZE)3
-5(HRE)3
8 MONTHS
3.MDR TB Cases
6(9)K O Et C Z E / 18( O Et C E )
24 – 27 MONTHS
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MDR – TB
MDR –TB : Bacteriological Dx- If the infecting organism is resistant to 1. INH2. Rifampicin with/without resistance to
other ATT XDR-TB : MDR –TB strains resistant to
FLUOROQUINOLONES & one of the Injectables – Kanamycin,Amikacin,
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Resistant /therapeutically refractory case : In clincal orthopedics – 1. No response to ATT / No progressive healing2. Destructive process 3. Continuing discharging sinuses , ulcers4. New cold abscess apearence5. size of existing cold absces
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Rx for Drug resistant TB Isolated INH resistance –Rx : Rifampicin Pyrazinamide Ethambutol –9M Isolated Rifampicin resistance – m/c in HIV pt Rx – several combinations for extended
period( upto 18 months) Isolated Pyrazinamide resistance – Rx: INH,
rifampicin for 9 months
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Rx of MDR – TB
Initial phase – 5 drugs – 6months Continuation phase – 4 drugs – 18 months 6 ( K O Et C Z E )/18 (O Et C E)- K – kanamycin ,O – ofloxacin , Et -
Ehionamide- C – Clycloserine,Z – Pyrazinamide,- E - Ethambutol
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Rx of XDR – TB : Higher generation FLUOROQUINOLONES are added to the core regimen
LEVOFLOXACIN –fluoroquinolone of choice Most forms of EPTB are adequately Rx with INH &
Rifampicin 9-12 months course for 1. TB meningitis2. POTT’S disease3. Any EPTB that remains culture positive longer than
expected
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Rx – Synovitis stage
Chemotherapy – ATT Bed rest Traction Mobilisation exercises prognosis – very good Surgical intervention – usually not
required
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Rx – Early Arthritis Chemotherapy – ATT Traction Analgesics supplementation Non wt bearing ROM exercises started as permitted Synovectomy & joint debridement Passive exercise pain,spasm . Thus avoided Prognosis in general - good
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Rx – Advanced Arthritis
All above & ARTHROLYSIS –subtotal excision of pathological
contracted fibrous capsule- Useful where limitation of movements is due to FIBROUS
ANKYLOSIS- Aim – To achieve useful ROM- Posterior capsule undisturbed – vital blood supply
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Rx – Advanced arthritis with subluxation / dislocation
Conservative traction regimen If sound ankylosis ,in bad position – upper
femoral corrective osteotomy Excision arthroplasty Arthrodesis Hip replacement
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In advanced arthritis usual outcome- FIBROUS ANKYLOSIS
Once fibrous ankylosis – anticipated / accepted – limb is immobilised in HIP SPICA for 4-6 months
Ideal position for ankylosis : - Neutral position b/w abduction & adduction- 5-10 deg of external rotation- Flexion depending upon age :children- 10 deg adults – 30 deg
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Arthrodesis..
Offered only for pt > 18yrs age Types : 1.Intra articular 2.Extra articular – if Adduction – Ischio
femoral - if abduction – Ilio
femoral 3.Combined intra –extra articular
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During extra articular arthrodesis ,upper femoral corrective osteotomy can also be performed – brings limb into functional position
Intraarticular arthrodesis permits- Exploration of joint- Excision of diseased tissue- Curretage of juxta articular infected tissue
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Operative tech – IA arthrodesis Standard anterolateral approach Grossly diseased capsule,synovium removed Joint dislocated carefully Excise cartilage ,subchondral bone from femoral
head & acetabulum down to cancellous bone Repose the rawed head into freshened acetabular
cavity,place cancellous bone graft all around the joint
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Keep the joint in best functional position & insert 2-3 long steinmann pins from base of GT – femoral neck & head – going into acetabulum
Apply hip spica After 6-8wks pins removed Gradual Wt bearing with POP on, is started using crutches Immobilisation & wt bearing continued for 4-6 months
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Very difficult to perform conventional arthrodesis if extensive destruction / sequestration of femoral head & neck
Rx – ABBOTT –LUCAS tech of fusion of hip in 2 stages
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Abbott & Lucas arthrodesis Can be done in active infection
ATT cover is mandatory1ST STAGE : Anterior Smith –Peterson approach- Remove capsule & debride joint- Remove femur neck stump& denude GT - Debride GT & acetabulum to bleeding cancellous bone,
then place GT into acetabulum with limb in wide abduction
- 30-90 deg abduction may be necessary, av -45deg
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2nd STAGE: 4-8 wks later, osteotomy carried abt 5 cm below LT through lower end of previous incision
Distal fragment is usually displaced slightly medially to allow a part of proximal fragment to fit into medullary canal of distal fragment
Apply hip spica which is removed after consolidation
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Brittain’s tech of EA arthrodesis
Expose proximal femur laterally,stay out of involved joint capsule
Perform subtrochanteric osteotomy angling upwards towards ischium beneath the involved acetabulum
With a currette,fashion a hole in the ischium below the involved hip joint capsule & drive the tibial graft across osteotomy site into ischium
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No internal fixation is used Hip spica applied After 8th wk post op – walking is
undertaken in the cast for upto 6months till fusion occurs
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Disadvantages of arthrodesis
Early development of degenerative osteo arthrosis in LS spine,ipsilateral knee, contralateral hip
Compensation for fused hip : - Rotation of pelvis
- flexion of ipsilateral knee during stance phase
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Activities max limited after fusion - bending,sitting on floor, cross legged
sitting ,- Squatting,kneeling,bicycling Thus no pt would accept a fused joint
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Excision arthroplasty..GIRDLESTONE – described excision of
femoral head,neck,proximal part of trochanter & acetabular rim for chronic dep seated infections of hip joint
Can be safely carried out in healed / active disease after growth completion
Provides – mobile ,painless hip with control of infection ,correction of deformity
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Some degree of SHORTENING, INSTABILITY Mean loss of length – 1.5 cm Shortening by postop prolonged
TRACTION in 30-50 deg of abduction upto 3months
TECTOPLASTY – improves instability MILCH - pelvic support osteotomy at the
level of ischeal tuberosity ,also reduces instability
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Hip replacement in TB .. THA in active infection – controversial due to risk of reactivation
Most authors suggest THA atleast 5-10 yrs after the last evidence of active infection
Reactivation of infection - 10-30% cases THA in healed TB Hip is now accepted Majority perform it in the stage of advanced arthritis /
its sequelae, when joint is unsalvageable
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Wang et al – combination of ATT for atleast 2wks preop & for atleast 12months post op
- THA in advanced active TB hip is a safe procedure with symptomatic relief & functional improvement
Sidhu et al – THA in active TB Hip is a safe procedure when perioperative ATT was used
- adequate surgical debridement , ATT Key for successful outcome
Kim et al – no difference in reactivation / healing with cemented /cementless implants
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Rx in chidren..
Synovitis & early arthritis – ATT - Traction - bed rest - supportive
Rx Management in advanced joint destruction
, wandering acetabulum,or with pathological subluxation is difficult & controversial
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Rx in children..
In children with arthritis –Traction failure
Open arthrotomy Synovectomy Debridement of diseased
joint Arthrodesis deferred till growth
completion
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In children with healed disease & gross deformity ,(flexion -30,Adduction >30, Abduction >10 deg)
extra articular corrective osteotomy
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