Presentation on theme: "CONNECTIVE TISSUE DISORDERS Presenter: Dr. Gituri Philip Moderator: Dr. Kingori."— Presentation transcript:
CONNECTIVE TISSUE DISORDERS Presenter: Dr. Gituri Philip Moderator: Dr. Kingori
Outline 1.Introduction 2.Classification & Types of connective tissue diseases 3.Presentations of CTDs 4.Specific Issues 5.Conclusions
Introduction to CTDs May affect predominantly bone, bone and soft tissues, systemic, May complicate orthopedic procedures musculoskeletal operations differ in preoperative preparations & outcomes May be classified into: 1.Congenital 2.Acquired 3.Inflammatory 4.Immune-mediated
Collagen 1.40% of the dry weight of bone is Organic components Collagen (90% of organic component) Collagen is primarily type I: provides tensile strength 2.Type II collagen 95% of collagen content in articular cartilage Provides cartilaginous framework and tensile strength Very stable, with a half-life of approximately 25years
Cont… Collagen type X Produced by hypertrophic chondrocytes during enchondral ossification: i.Growth plate ii.Fracture callus iii.Heterotopic ossification formation iv.Calcifying cartilaginous tumors Is associated with calcification of cartilage A genetic defect in type X collagen responsible for Schmid’s metaphyseal chondrodysplasia (affects the hypertrophic physeal zone).
Cont… Collagen type XI an adhesive that holds the collagen lattice together
Introduction Inherited disorders of connective tissue: clinically and genetically diverse group of conditions affecting primarily the skin, joints, and, often, the cardiovascular system. severity of the musculoskeletal phenotype depends on i.the type of mutation ii.the role & function of the affected protein on musculoskeletal structure
Types of collagen Type Tissues I Skin, tendon, bone, meniscus, annulus fibrosus II Articular cartilage, vitreous humor, nucleus pulposus III Skin, muscle, blood vessels IV basement membrane (basal lamina) V,VI,IX,X articular cartilage X Articular cartilage, mineralization of cartilage in hypertrophic zone of physis XI Articular cartilage XII Tendon XIII endothelial cells
Marfan syndrome Incidence is 1 in 10,000 Autosomal dominant; 25% new mutations Mutation in fibrillin-1 gene on chromosome 15q21; multiple mutations identified Affected individuals: Dolichostenomelia Arachnodactyly Positive wrist sign (Walker sign) Positive thumb sign (Steinberg sign)
Arm span-to-height ratio >1.05 Cardiac defects, especially aortic root dilatation Scoliosis is seen in 60% to 70% of patients dural ectasia is common (>60%) Pectus excavatum and spontaneous pneumothoraces Pectus carinatum or asymmetric deformity of anterior chest Superior lens dislocation (ectopia lentis) and myopia Protrusio acetabuli and severe pes planovalgus
Diagnosis Clinical assessment mutational or linkage analysis in familial phenotypes
Classification of Marfans syndrome 1.Ghent system: 1 major criterion in each of two different organ systems and involvement in a third system 2.MASS (mitral valve prolapse, aortic root diameter at upper limits of normal, stretch marks, skeletal manifestations of Marfan) phenotype
Treatment i.Multi-disciplinary ii.Nonsurgical a)Beta blockers for mitral valve prolapse, aortic dilatation b)ii. Bracing for early scoliosis, pes planovalgus iii.Surgical a)For progressive scoliosis- long scoliosis fusion b)progressive protrusio acetabuli, closure of the triradiate cartilage c)progressive pes planovalgus, corrective surgery
Ehlers-Danlos syndrome (EDS) hypermobile joints, hyperextensible skin, fragile tissues extremely susceptible to trauma 40% to 50% of patients: mutation in COL5A1 or COL5A2 ( type V collagen gene) 7 types classic form: AD Type VI, AR (mutation in lysyl hydroxylase. Severe kyphoscoliosis - characteristic) Type IV, AD(mutation in COL3A1 thus abnormal collagen III; arterial, intestinal, and uterine rupture seen
Clinical Presentation Skin: velvety and fragile. Severe scarring with minor trauma common Joints: hypermobile, esp the shoulders, patellae, and ankles Pes planus “double-jointed” fingers frequent sprains or subluxation of larger joints spontaneously or after slight trauma 1/3 of patients: aortic root dilatation vascular subtype: spontaneous visceral or arterial ruptures
Importance to surgery skin splits from trauma, is relatively painless does not bleed excessively, wounds tend to gape wound margins tend to retract heal slowly& often become infected Dehiscence common, & complete wound breakdown may require repeated suturing or healing by secondary intention
Beighton Criteria for Joint Hypermobility 1.Passive dorsiflexion of the fifth finger > 90 degrees 2.Passive apposition of the thumbs to the flexor aspect of the forearm (Beighton sign) 3.Hyperextension of the elbow > 10 degrees 4.Hyperextension of the knees > 10 degrees 5.Ability of the palms to completely touch the floor during forward flexion of the trunk with knees fully extended
Treatment 1.triad of a)anticipatory guidance, b)pain management c)Physical therapy 2.Avoid surgery for lax joints; soft-tissue procedures unlikely to work 3.Progressive scoliosis in type VI (necessary ) 4.Orthopedic procedures: Bracing & longer fusions for Progressive scoliosis in type VI
Osteogenesis imperfecta (OI) Types I through IV : mutation in the COL1A1 and COL1A2 genes bone that has decreased number of trabeculae and cortical thickness (wormian bone) Types V through VII no collagen I mutation but o similar phenotype and o abnormal bone on microscopy
Clinical presentation of OI Child abuse should not be ruled out types II and III, basilar invagination and severe scoliosis may occur Olecranon apophyseal avulsion fractures characteristic dentinogenesis imperfecta, hearing loss, blue sclerae, joint hyperlaxity, and wormian skull bones frequency of fractures declines sharply after adolescence
TypeSeverityFeaturesScleraeInheritance IA, IBMildMost common, mild to moderate bone fragility, little or no deformity BlueAD IILethal, rarely survive infancy Extremely fragile bones, severe deformity, perinatal BlueAR IIISevereProgressively deforming, moderate to severe deformity, progressive, neonatal fractures NormalAR IVA, IVBModerately severeMild to moderate bone fragility, long bone/spine deformity, A with dental involvement NormalAD
Treatment of OI multi-disciplinary approach. Manage fractures with light splints IV & PO Bisphosphonates and growth hormone severe bowing of the limbs or recurrent fracture: intramedullary fixation is indicated with or without osteotomy. Progressive scoliosis/basilar invagination is treated with spinal fusion Transplantation of adult mesenchymal stem cells
Other collagen associated diseases 1.Scurvy Acquired: vitamin C deficiency decrease in chondroitin sulfate and collagen synthesis greatest deficiency seen in the metaphysis P/E: microfractures, hemorrhages, and collapse of the metaphysis Characteristic radiographic findings :line of Frankel and osteopenia of the metaphysis.
Scurvy Vitamin C (ascorbic acid) deficiency Produces a decrease in chondroitin sulfate synthesis defective collagen growth and repair impaired intracellular hydroxylation of collagen peptides Clinical features: i.Fatigue ii.Gum bleeding iii.Ecchymosis iv.Joint effusions v.Iron deficiency Radiographic findings: o thin cortices & trabeculae and metaphyseal clefts (corner sign)
Treatment of MED 1.bone survey to differentiate between MED and single epiphyseal dysplasia, as well as to identify all areas of involvement. 2.Treat limb alignment and perform early joint replacement.
Spondyloepiphyseal dysplasia Genetic defect: gene encoding type II collagen abnormal epiphyseal development in the upper and lower extremities Scoliosis: sharply curved apex over a small number of vertebrae Retinal detachment and respiratory problems common.
Kniest Syndrome Defect within type II collagen AD inheritance Presentation short-trunked, disproportionate dwarfism joint stiffness/contractures, Scoliosis, kyphosis, dumbbell-shaped femora, and hypoplastic pelvis and spine Otitis media and hearing loss frequent Xray : Osteopenia and dumbbell-shaped bones Rx : Early therapy for joint contractures. Reconstructive procedures for early hip degenerative arthritis.
Arthritides Rheumatoid (seropositive) arthritis (RA) inflammatory autoimmune arthritis causes joint destruction at a younger age synovium thickens, fills with B-cells, T-cells, and macrophages, that erode the cartilage multiple hot, swollen, morning stiffness. Subcutaneous calcified nodules and iridis Radiographs: symmetric joint space narrowing, periarticular erosions, and osteopenia
Treatment of RA 1.Nonsurgical: NSAIDs & DMARDs 2.Surgical i.synovectomy ii.joint realignment early iii.joint arthroplasty later stages.
Conclusions 1.Mutation in the genes coding for various collagen a chains result in a heterogeneous group of heritable conditions (collagenopathies) 2.Mutations in types II, IX, and XI collagens affects the musculoskeletal, ocular, visual systems, or all three 3.Diagnosis : clinical findings, radiographic findings, & genetic test results 4.Follow-up and management: multidisciplinary 5.Rx is symptomatic and individualized