Joints: Part B 10/30/14. Classification of Synovial Joints. Six types, based on shape of articular surfaces: Plane Joints
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1 PowerPoint Lecture Slides prepared by Janice Meeking, Mount Royal College C H A P T E R 8 Joints: Part B Classification of Synovial Joints Six types, based on shape of articular surfaces: Plane Hinge Pivot Condyloid Saddle Ball and socket Plane Joints Nonaxial joints Flat articular surfaces Short gliding movements f Nonaxial Uniaxial Biaxial Multiaxial a Plane joint (intercarpal joint) c b a e d Figure 8.7a 1
2 Hinge Joints Uniaxial joints Motion along a single plane Flexion and extension only f Nonaxial Uniaxial Biaxial Multiaxial b Hinge joint (elbow joint) c b a e d Figure 8.7b Pivot Joints Rounded end of one bone conforms to a sleeve, or ring of another bone Uniaxial movement only f Nonaxial Uniaxial Biaxial Multiaxial c b c Pivot joint (proximal radioulnar joint) a e d Figure 8.7c 2
3 Condyloid (Ellipsoidal) Joints Biaxial joints Both articular surfaces are oval Permit all angular movements f Nonaxial Uniaxial Biaxial Multiaxial d Condyloid joint (metacarpophalangeal joint) c b a e d Figure 8.7d Saddle Joints Biaxial Allow greater freedom of movement than condyloid joints f Nonaxial Uniaxial Biaxial Multiaxial Each articular surface has both concave and convex areas e Saddle joint (carpometacarpal joint of thumb) c b a e d Figure 8.7e 3
4 Ball-and-Socket Joints Multiaxial joints The most freely moving synovial joints f Nonaxial Uniaxial Biaxial Multiaxial f Ball-and-socket joint (shoulder joint) c b a e d Figure 8.7f Knee Joint Largest, most complex joint of body Three joints surrounded by a single joint cavity: Femoropatellar joint: Plane joint Allows gliding motion during knee flexion Lateral and medial tibiofemoral joints between the femoral condyles and the C-shaped lateral and medial menisci (semilunar cartilages) of the tibia Allow flexion, extension, and some rotation when knee is partly flexed A&P Flix : Movement at the knee joint Femur capsule Posterior cruciate Lateral meniscus Anterior cruciate Tibia Tendon of quadriceps femoris Suprapatellar bursa Patella Subcutaneous prepatellar bursa Synovial cavity Lateral meniscus Infrapatellar fat pad Deep infrapatellar bursa Patellar (a) Sagittal section through the right knee joint Figure 8.8a 4
5 Anterior Knee Joint Anterior cruciate cartilage on medial tibial condyle Medial meniscus Posterior cruciate cartilage on lateral tibial condyle Lateral meniscus At least 12 associated bursae Capsule is reinforced by muscle tendons: E.g., quadriceps and semimembranosus tendons Joint capsule is thin and absent anteriorly Anteriorly, the quadriceps tendon gives rise to: Lateral and medial patellar retinacula Patellar (b) Superior view of the right tibia in the knee joint, showing the menisci and cruciate s Figure 8.8b Quadriceps femoris muscle Tendon of quadriceps femoris muscle Patella Lateral patellar retinaculum Fibular collateral Fibula (c) Anterior view of right knee Medial patellar retinaculum Tibial collateral Patellar Tibia Knee Joint Capsular and extracapsular s Help prevent hyperextension Intracapsular s: Anterior and posterior cruciate s Prevent anterior-posterior displacement Reside outside the synovial cavity Figure 8.8c 5
6 Tendon of adductor magnus Medial head of gastrocnemius muscle Popliteus muscle (cut) Tibial collateral Tendon of semimembranosus muscle Femur capsule Oblique popliteal Lateral head of gastrocnemius muscle Bursa Fibular collateral Arcuate popliteal Tibia (d) Posterior view of the joint capsule, including s Figure 8.8d Fibular collateral Lateral condyle of femur Lateral meniscus Tibia Fibula Animation: Rotatable knee Posterior cruciate Medial condyle Tibial collateral Anterior cruciate Medial meniscus Patellar Patella Quadriceps tendon (e) Anterior view of flexed knee, showing the cruciate s (articular capsule removed, and quadriceps tendon cut and reflected distally) Figure 8.8e Lateral Hockey puck Patella (outline) Medial Tibial collateral (torn) Medial meniscus (torn) Anterior cruciate (torn) Shoulder (Glenohumeral) Joint Ball-and-socket joint: head of humerus and glenoid fossa of the scapula Stability is sacrificed for greater freedom of movement Figure 8.9 6
7 Acromion of scapula Coracoacromial Subacromial bursa Fibrous articular capsule Tendon sheath Tendon of long head of biceps brachii muscle Synovial cavity of the glenoid cavity containing synovial fluid Hyaline cartilage Synovial membrane Fibrous capsule Humerus Shoulder Joint Reinforcing s: Coracohumeral helps support the weight of the upper limb Three glenohumeral s somewhat weak anterior reinforcements (a) Frontal section through right shoulder joint Animation: Rotatable shoulder Figure 8.10a Shoulder joint Reinforcing muscle tendons: Tendon of the long head of biceps: Travels through the intertubercular groove Secures the humerus to the glenoid cavity Four rotator cuff tendons encircle the shoulder joint: Subscapularis Supraspinatus Infraspinatus Teres minor A&P Flix : Rotator cuff muscles: An overview (a) A&P Flix : Rotator cuff muscles: An overview (b) Acromion Coracoacromial Subacromial bursa Coracohumeral Greater tubercle of humerus Transverse humeral Tendon sheath Tendon of long head of biceps brachii muscle Coracoid process capsule reinforced by glenohumeral s Subscapular bursa Tendon of the subscapularis muscle Scapula (c) Anterior view of right shoulder joint capsule Figure 8.10c 7
8 Acromion Coracoid process capsule Glenoid cavity Glenoid labrum Tendon of long head of biceps brachii muscle Glenohumeral s Tendon of the subscapularis muscle Scapula Posterior Anterior (d) Lateral view of socket of right shoulder joint, humerus removed Figure 8.10d Elbow Joint Radius and ulna articulate with the humerus Hinge joint formed mainly by trochlear notch of ulna and trochlea of humerus Flexion and extension only A&P Flix : Movement at the elbow joint Humerus Fat pad Tendon of triceps muscle Bursa capsule Synovial membrane Synovial cavity cartilage Coronoid process Tendon of brachialis muscle Ulna Elbow Joint Anular surrounds head of radius Two capsular s restrict side-to-side movement: Ulnar collateral Radial collateral Trochlea cartilage of the trochlear notch (a) Median sagittal section through right elbow (lateral view) Figure 8.11a 8
9 capsule Humerus Anular Humerus Anular Coronoid process Lateral epicondyle capsule Radial collateral Olecranon process (b) Lateral view of right elbow joint Radius Ulna Radius (d) Medial view of right elbow Animation: Rotatable elbow Medial epicondyle Ulnar collateral Ulna Figure 8.11b Figure 8.11d Hip (Coxal) Joint Ball-and-socket joint Head of the femur articulates with the acetabulum Good range of motion, but limited by the deep socket cartilage Acetabular labrum Femur Coxal (hip) bone Ligament of the head of the femur (um teres) Acetabular labrum enhances depth of socket A&P Flix : Movement at the hip joint: An overview Synovial cavity capsule (a) Frontal section through the right hip joint Figure 8.12a 9
10 Hip Joint Reinforcing s: Iliofemoral Pubofemoral Ischiofemoral Ligamentum teres Ischium Iliofemoral Ischiofemoral Greater trochanter of femur (c) Posterior view of right hip joint, capsule in place Animation: Rotatable hip Figure 8.12c Anterior inferior iliac spine Greater trochanter Iliofemoral Pubofemoral Temporomandibular Joint (TMJ) Mandibular condyle articulates with the temporal bone Two types of movement Hinge depression and elevation of mandible Gliding e.g. side-to-side (lateral excursion) grinding of teeth Most easily dislocated joint in the body (d) Anterior view of right hip joint, capsule in place Figure 8.12d 10
11 External acoustic meatus Mandibular fossa tubercle Zygomatic process Infratemporal fossa capsule Mandibular fossa disc tubercle Superior joint cavity capsule Ramus of mandible Lateral (a) Location of the joint in the skull Figure 8.13a Synovial membranes Mandibular condyle Ramus of Inferior joint mandible cavity (b) Enlargement of a sagittal section through the joint Figure 8.13b Common Joint Injuries Sprains The s are stretched or torn Partial tears slowly repair themselves Complete ruptures require prompt surgical repair Cartilage tears Due to compression and shear stress Fragments may cause joint to lock or bind Cartilage rarely repairs itself Repaired with arthroscopic surgery Torn meniscus Figure
12 Common Joint Injuries Dislocations (luxations) Occur when bones are forced out of alignment Accompanied by sprains, inflammation, and joint immobilization Caused by serious falls or playing sports Subluxation partial dislocation of a joint Inflammatory and Degenerative Conditions Bursitis An inflammation of a bursa, usually caused by a blow or friction Treated with rest and ice and, if severe, antiinflammatory drugs Tendonitis Inflammation of tendon sheaths typically caused by overuse Symptoms and treatment similar to bursitis Arthritis >100 different types of inflammatory or degenerative diseases that damage joints Most widespread crippling disease in the U.S. Symptoms; pain, stiffness, and swelling of a joint Acute forms: caused by bacteria, treated with antibiotics Chronic forms: osteoarthritis, rheumatoid arthritis, and gouty arthritis Osteoarthritis (OA) Common, irreversible, degenerative ( wearand-tear ) arthritis 85% of all Americans develop OA, more women than men Probably related to the normal aging process 12
13 Osteoarthritis (OA) More cartilage is destroyed than replaced in badly aligned or overworked joints Exposed bone ends thicken, enlarge, form bone spurs, and restrict movement Treatment: moderate activity, mild pain relievers, capsaicin creams, glucosamine and chondroitin sulfate Rheumatoid Arthritis (RA) Chronic, inflammatory, autoimmune disease of unknown cause Usually arises between age 40 and 50, but may occur at any age; affects 3 times as many women as men Signs and symptoms include joint pain and swelling (usually bilateral), anemia, osteoporosis, muscle weakness, and cardiovascular problems Rheumatoid Arthritis RA begins with synovitis of the affected joint Inflammatory blood cells migrate to the joint, release inflammatory chemicals Inflamed synovial membrane thickens into a pannus Pannus erodes cartilage, scar tissue forms, articulating bone ends connect (ankylosis) Figure
14 Rheumatoid Arthritis: Treatment Conservative therapy: aspirin, long-term use of antibiotics, and physical therapy Progressive treatment: anti-inflammatory drugs or immunosuppressants New biological response modifier drugs neutralize inflammatory chemicals 14
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