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RHEUMATOID ARTHRITIS AND THE HAND 1 Chapter objectives FINAL Leslie Schrieber After studying this chapter you should be able to: NOT 1. Explain the structure and function of synovial joints. - 2. Understand the relevant anatomy of the hand and wristELSEVIER joints. 3. Discuss the basic function of the immune system. 4. Understand the aetiopathogenesis of rheumatoidOF arthritis. 5. Describe the pathological changes that occur in inflammatory arthritis. CONTENT 6. Recognize the common clinical presentations and features of rheumatoid arthritis and their pathophysiological basis. 7. Develop an approach to the differential diagnosis of inflammatory arthritis. PROPERTY 8. Describe extra-articular manifestations of rheumatoid arthritis and explain their pathophysiologicalSAMPLE basis. 9. Understand the principles that govern the team approach to the management of rheumatoid arthritis. 10. Describe the clinical pharmacology and use of non-steroidal anti-inflammatory drugs, corticosteroids, disease-modifying anti- rheumatic drugs and biological therapies in the treatment of rheumatoid arthritis. 11. Discuss the place of orthopaedic surgery in the treatment of rheumatoid arthritis. 12. Appreciate the long-term prognosis of rheumatoid arthritis. http://www.us.elsevierhealth.com/Medicine/Basic-Science/book/9780702033773/The-Musculoskeletal-System 1 Introduction Synovial , or diarthrodial joints, are the commonest type of joint and are the most mobile. They possess a synovial membrane, have a cavity that contains synovial fl uid, and Synovial joints, the most mobile type of joints in the are subclassifi ed into ball and socket (e.g. hip), hinge (e.g. body, are susceptible to infl ammatory injury leading to interphalangeal) and saddle (e.g. fi rst carpometacarpal) arthritis. The synovium is a common target of a variety of types. These joints ( Fig. 1.1 ) allow the cartilaginous sur- insults including direct microbial infection, crystal depo- faces of the joint ends to move effi ciently and smoothly, sition and autoimmune attack, e.g. in rheumatoid arthri- with low frictional resistance. Different designs allow tis (RA). This chapter will review normal synovial joint for different movements, including fl exion (bending), structure and function, the processes that lead to infl am- extension (straightening), abduction (movement away matory arthritis, an approach to differential diagnosis, and the principles of treatment of RA. The topic and dis- cussion will be illustrated by a patient with infl ammatory arthritis found to have RA. It is the commonest chronic infl ammatory rheumatic disease, affecting 1 – 2% of the population. RA not only produces extensive morbidity, but also is associated with a reduction in life expectancy. RHEUMATOID ARTHRITIS AND THE HAND RHEUMATOID Essential anatomy and physiology Synovial joint anatomy FINAL There are three types of joints in the body: synarthroses, amphiarthroses and diarthroses (synovial joints). Hinge Synarthroses are joints that have an interlocking suture line between adjacent bones (e.g. skull bones) — this NOT provides a very strong bond. The synarthrosis grows - during maturation of the developing brain and is even-ELSEVIER tually replaced by bony union between the adjacent bones. Amphiarthroses are joints that have fi brocartilage between adjacent bones — this allows for fl exibility.OF They are found in the rib cage, the sacroiliac joint and between vertebral bodies — the intervertebral discs. CONTENT Case (A) 1.1 Rheumatoid arthritis: 1 Case history Ball and socket Mrs Gale is a 43-year-oldPROPERTY woman who, together with her husband, runs a domestic cleaning company. She presents with a 9-month history of painfulSAMPLE hands and wrists. Her symptoms started with occasional early-morning stiffness and swelling in her right knee, followed shortly afterwards by similar symptoms in her hands and wrists. Mrs Gale says she is no longer able to help her husband in the cleaning business. The pain is getting worse. Physical examination reveals symmetrical soft-tissue swelling in all of the proxi- mal interphalangeal and metacarpophalangeal joints of both hands and wrists. Her right knee joint is swollen and has an effusion. The metatarsophalangeal joints are tender to palpation. A provisional diagnosis of an infl ammatory arthritis, probably rheumatoid arthritis, is made. Interpretation of this presentation requires knowledge of synovial joint struc- (B) ture in general and the hands in particular as well as knowl- edge of the immune system in health and disease. Fig. 1.1 Types of synovial joint: (A) hinge joint; (B) ball and socket joint. 2 SYSTEMS OF THE BODY http://www.us.elsevierhealth.com/Medicine/Basic-Science/book/9780702033773/The-Musculoskeletal-System 1 RHEUMATOID ARTHRITIS AND THE HAND RHEUMATOID from midline), adduction (movement towards midline), removing large molecules from the synovium. The lat- and rotation. They are more susceptible to infl ammatory ter is innervated and pain sensitive, particularly during injury than are other types of joints. infl ammation. Synovial joints are surrounded by a capsule that defi nes the boundary between articular and periarticu- lar structures ( Fig. 1.2 ). Reinforcing the capsule are liga- Synovial joint physiology ments and muscular tendons, which act across the joint. The joint capsule, ligaments and tendons are composed Normal synovial joints are highly effective in allowing principally of type 1 collagen fi bres — type 1 collagen is low-friction movement between articulating surfaces. the major fi brous protein of connective tissue. Articular cartilage is elastic, fl uid-fi lled and supported The synovium has a lining layer that consists of spe- by a relatively impervious layer of calcifi ed cartilage and cial cells called synoviocytes and is normally one to three bone. Load-induced compression of cartilage forces inter- cells thick. There is no basement membrane separat- stitial fl uid to fl ow laterally within the tissue through ing the synoviocyte layer from the subintima ( Fig. 1.3 ). adjacent cartilage. This assists in protecting the cartilage There are at least two different types of synoviocyte cell: against mechanical injury. type A and type B. Type A are of bone marrow-derived Synovial fl uid ( Fig. 1.4 ) is present in small quantities macrophage (phagocyte or ‘ hungry cell ’ ) lineage and in normal synovial joints. It is a clear, relatively acellular, type B are fi broblast-like mesenchymal (connective tis- sue) cells. Other cell types in this layer include dendritic cells — antigen-processing cells involved in generating an immune response. The synoviocytes lie in a stroma com- posed of collagen fi brils and proteoglycans (a diverse group of glycosylated proteins that are abundant in the FINAL extracellular matrix of connective tissues), which is con- tinuous with the subintima. The latter may be fi brous, fatty or areolar (contain loose connective tissue). It con- tains a dense network of fenestrated capillaries (small NOT blood vessels) that facilitate the exchange of molecules - between the circulation and the synovium. The vessels ELSEVIER are derived from branches of the arterial plexus that sup- plies the joint capsule and juxta-articular bone. There is also a lymphatic supply— a vascular system involvedOF in Skin and subcutaneous CONTENT tissue Bursa Fig. 1.3 Histology of a normal synovial joint. Bone Enthesis PROPERTY SAMPLE Capsule Tendon Synovium Tendon Fibrocartilage sheath pad Joint space Ligamentous thickening of capsule Muscle Hyaline articular Bursa cartilage Fig. 1.4 Synovial fl uid — macroscopic appearance, from left to right: normal or osteoarthritis; infl ammatory (e.g. rheumatoid arthritis); Fig. 1.2 Structure of a synovial joint. gout; septic; and haemarthrosis (blood). THE MUSCULOSKELETAL SYSTEM 3 http://www.us.elsevierhealth.com/Medicine/Basic-Science/book/9780702033773/The-Musculoskeletal-System 1 viscous fl uid that covers the surface of synovium and car- The wrist or radiocarpal joint is formed proximally tilage. Synovial fl uid is an ultrafi ltrate of blood to which by the distal end of the radius and the articular disc, and hyaluronic acid is added. Hyaluronic acid is secreted by distally by a row of carpal bones, the scaphoid, lunate, synoviocytes and is the molecule responsible for synovial pisiform and triquetrum ( Fig. 1.5A ). The articular disc fl uid viscosity, acting as a lubricant for synovial – cartilage joins the radius to the ulnar and separates the distal end interaction. Synovial fl uid represents an important site of the ulnar from the wrist joint proper. The wrist joint is for exchange of nutrients and metabolic by-products surrounded by a capsule and supported by ligaments. between plasma and the surrounding synovial mem- The distal radioulnar joint is adjacent to but not nor- brane. The synovial cavity can be used to advantage as mally part of the wrist joint, since the articular disc a site in which therapeutic agents are introduced, e.g. divides these joints into separate cavities ( Fig. 1.5A ). The intra-articular corticosteroids to treat infl amed synovium, midcarpal joint is formed by the junction of the proxi- as well as for diagnostic aspiration. mal and distal rows of the carpal bones. Limited fl exion, Normal synovial fl uid contains only small quantities extension and some rotation occur in the midcarpal joint. of low molecular weight proteins compared with plasma. Pronation and supination occur primarily at the proximal The barrier to the entry of proteins probably resides and distal radioulnar articulations.
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