thr in ra as
TRANSCRIPT
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THR IN AS & RA
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• Seropositive - Rheumatoid arthritis (RA)
• Seronegative spondyloarthropathies
Ankylosing spondylitis (AS)
Psoriatic arthritis (PsA)
Reactive arthritis
Behcet syndrome
Juvenile idiopathic arthritis
Enteropathic arthritis
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ANKYLOSING SPONDYLITIS
• Ankylosing spondylitis (AS) is a chronic inflammatory disease of unknown etiology which primarily affects the sacroiliac joints, spine, hips and, less commonly, the knee joints
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Clinical criteria for the diagnosis of AS
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• prevalence of AS- 0.1% and 1.4% globally more common within Europe and Asia and much less common in Latin America and Africa.
• HLA B27 gene
• typically affects young adults, most commonly males (M:F = 3:1) in their second through fourth decades
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• Hip involvement - 30–50% of patients with AS
• 90% patients among those with the affected hips have bilateral involvement
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PREOPERATIVE CONSIDERATIONS
• ANESTHETIC PERSPECTIVE- Problems related to management of the upper airway, presence of pulmonary restriction, cardiac involvement and access to the neuroaxis.
• rigid and flexed cervical spine - intubation difficult Fibreoptic intubation is generally preferred.
• pulmonary function test. • Increased incidence of pulmonary complications such as
atelectasis and pneumonia in the postoperative period .• lumbar spine disease associated with ossified ligaments
may make spinal or epidural anesthesia technically difficult
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• SURGEON PERSPECTIVE- evaluate and document spinal involvement, pelvic obliquity, and limb length discrepancy, status of the contralateral hip, bilateral knees and integrity of the sciatic nerve.
• Radiographs of the entire spine should be examined to rule out presence of pseudarthrosisor Anderson lesion.
• A preoperative standing lateral view of the pelvis should be obtained so as to prevent a positioning error of the acetabular component.
• Preoperative templating.
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• Prospective data on perioperative infection risk have not shown an increased risk with methotrexate, and it is generally not withheld in the perioperative period.
• The risk of infection with anti-TNF agents is however well recognized, and it is therefore recommended to stop these drugs before elective orthopaedic surgery
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Order of surgery in AS
• Recommendations for performing THA before spinal osteotomy : improvement in hip ROM and pain relief may obviate the need for spinal osteotomy or give a more accurate assessment of residual spinal deformity in patients with severe hip flexion deformity.
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• recommendations to do spinal osteotomybefore THR- 1.AS patients with a severe kyphotic deformity have the potential risk of anterior dislocation of the prosthesis, as pelvic hyperextension to compensate for a kypkoticspine brings the cup to a more open position with an exaggerated anteversion.
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2. hyperextension of immobile spine during THR could lead to intra-operative thoracic vertebral body extension fractures with resultant acute traumatic paraplegia.
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Neck cut in ankylosed hips
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Technical considerations while doing THR in AS
• Problems relate to:
• positioning of the patient
• femoral neck cut
• original joint line identification
• acetabular component positioning
• adequate release of soft tissues.
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preoperative EXTERNAL ROTATION deformity
visualizing the femoral neck through the posterior approach is difficult.
options in such a situation- Identifying the neck by dissection anterior to the greater trochanterand the abductors
sacrificing 2-3 mm of the posterior acetabularwall
performing the neck osteotomy under image intensifier control with the patient in the supine position
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Identifying the location of the original joint line
• foveal soft tissue and incomplete gray ossifying cartilage usually remains at the location of the original joint plane
• intraoperative radiographs could be helpful in such a situation
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PELVIC OBLIQUITY
• Malposition of acetabular component often results in ANTERIOR dislocation.
• AS patients with a fixed kyphotic spine tend to hyperextend their hips once they stand upright, in an attempt to look forward.
• The pelvic hyperextension brings the cup to a more open position with an exaggerated anteversion.
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• In a 3-D CT based study, Tang et al. found that anatomical positioning of the cup in a pelvis with more than 20° of sagittal pelvic malrotationresulted in a cup positioning with an anteversionof more than 30° and an inclination of more than 55°.
• According to them, for each 10° of sagittal pelvic malrotation above 20°, the cup position should be modified so that it is 5° less inclined and anteverted.
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Abduction & adduction deformities in contralateral hip
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ADEQUATE SOFT TISSUE RELEASES
• Adductor tenotomy, iliopsoas muscle release, and anterior capsulotomy is often required to correct severe contractures.
• Forcible correction of the flexion contracture without adequate soft tissue release can result in fracture of the stiff spine with dire neurological consequences
• In patients with hips stiff in full extension, gluteus maximums contractures are often present and may require release.
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complications
• Heterotopic ossification
• anterior dislocation of the hip
• susceptibility to spinal fractures during THA
• sciatic nerve palsy
• intraoperative fracture at the level of the calcar-femorale
• Aseptic loosening remains the main reason for revision surgery in patients with AS
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Survivorship
Survival analysis using the Kaplan-Meier estimate revealed a survival probability after 10, 15, and 20 years to be 90%, 79%, and 65% for primary replacement, and 75%, 61%, and 61%, respectively, for revisions.
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• Rt hip has fibrous ankylosis – MoM hip resurfacing done
• Lt hip has bony ankylosis-uncemented THR
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RHEUMATOID ARTHRITIS
• Rheumatoid arthritis (RA) is the most common chronic inflammatory condition and affects 3% of women and 1% of men
• peak age of onset between 35 and 45 years
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• susceptibility loci reside in the HLA region on chromosome 6
• Environmental triggers- smoking
high alcohol intake
coffee
vitamin D levels
low socio-economic group
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activation of inflammatory pathways
persistent synovial inflammation
subsequent joint and periarticular bone destruction
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SURGICAL CHALLENGES
• Surgical challenges at the hip –
acetabular protrusio
focal bone loss
osteoporosis
Flexion contractures
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PROTRUSIO ACETABULI
2 types- convergent protrusio
divergent protrusio
In convergent protrusio - grafting is not required
In divergent protrusio – high hip centre, impaction grafting is required
Radiographic hallmark of protrusio- medial migration of the femoral head beyond the ilioischial (Kohler) line.
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