introduction to orthopedic anatomy - fac.ksu.edu.sa · orthopedic anatomy traumatology rhs 231 dr....
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Introduction to Orthopedic Anatomy
TraumatologyRHS 231
Dr. Einas Al-EisaLecture 2
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Types of Joints
SynovialDiarthroidal
Freely movable
CartilagenousAmphiarthroidalSlightly movable
FibrousSynarthroidalImmovable
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Fibrous(Synarthroidal) =Immovable joints
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Synchodroses =Fibrocatilagenous joint that allows very slight movement
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Fibrocartilagenous joint
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Syndesmosis = bones held together by strong ligaments that allow minimal movement
Inferior tibiofibular joint
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Synovial joint
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Characteristics of Synovial Joints
• Articular end plate = a thin layer of compact bone over the spongy bone (covering the ends of the bones)
• Articular (hyaline) cartilage for shock absorption, stability, improved fit for the surfaces, lubrication
Covered by:
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Characteristics of Synovial Joints
• Joint capsule = a fibrous connective tissue that surround the bony ends forming the joint
• Synovial membrane = loose, vascularized connective tissue that secretes synovial fluid into the joint cavity for lubrication
Lined with:
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Synovial joint
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Characteristics of Synovial Joints
• Where additional support is needed, the joint capsule is thickened to form tough, non-elastic ligaments to provide additional support.
• Stability of a synovial joint is provided by: the capsule, ligaments, muscles & tendons spanning the joint, and the congruency of the bone surfaces.
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Types of synovial joints
1) Plane (gliding) joint: consists of two flat surfaces that glide over each other.
Example: carpals & tarsals
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Plane (gliding) Joint
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Types of synovial joints
2) Hinge joint: allow movement in one plane (flexion / extension).
Example: interphalangeal joints (hand), ulnohumeral joint (elbow)
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Hinge Joint
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Types of synovial joints
3) Pivot Joint: allows a rotational movement around a long axis.
Example: superior & inferior radioulnar joint (pronation / supination), atlantoaxial joint at the base of the skull (rotation)
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Pivot Joint
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Types of synovial joints
4) Condyloid joint: allows movement in two planes (flexion / extension and abduction /adduction) without rotation.
Example: metacarpophalangeal joints
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Condyloid Joint
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Types of synovial joints
5) Saddle joint: allows two planes of movement (flexion / extension, abduction / adduction).
Example: only found at the carpometacarpaljoint of the thumb.
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Saddle Joint
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Types of synovial joints
6) Ball-and-socket joint: allows movement in all three planes (flexion/extension, abduction/adduction, & rotation)
Example: the hip and shoulder joints.
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Ball-and-socket Joint
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Architecture of bone(osseous tissue)
1. Cortical (compact) bone: – the exterior dense layer of the bone– consists of hollow tubes called lamellae
(collagen fibers that are arranged in layers and run in different directions)
– A series of lamellae form an osteon or haversian system (weight-bearing pillars)
– Provides strength for weight bearing & stiffness in response to muscle tension
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Osteon
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Architecture of bone(osseous tissue)
2. Cancellous (spongy) bone : – interior to cortical bone– consists of flat pieces of bone called
trabeculae (collagen runs along the axis of the trabeculae)
– Provides energy absorption & stress distribution in response to loads
– Not as strong as cortical bone (risk of fracture in the elderly)
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Types of Bones
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Long Bones
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Long Bones
• Consist of a shaft called diaphysis (made of compact bone), which broadens out into the epiphysis (made up of spongy bone inside a thin layer of compact bone)
• Offer support and leverage
• Example: humerus, radius, ulna, femur, tibia, fibula, metacarpals, metatarsals
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Flat Bones
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Flat Bones
• Consist of two layers of compact bone with spongy bone in between
• Protect internal structures and offer broad surfaces for muscle attachments
• Example: ribs, illium, sternum, scapula
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Short Bones
• Consist of spongy bone covered with a thin layer of compact bone
• Play an important role in shock absorption and transmission of forces
• Example: carpals of the hand and the tarsals of the foot
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Irregular Bones
• Consist of spongy bone and thin exterior layer of compact bone
• Specialized functions such as supporting the weight, protecting the spinal cord, dissipating loads
• Example: vertebrae, ischium, pubis
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Sesamoid Bones
• Short type of bone embedded in a tendon or joint capsule
• Alter the angle of muscle insertion to increase its mechanical advantage
• Example: the patella embedded in the quadriceps tendon, sesamoid bones within the flexor tendons of the great toe & thumb
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Accessory ossicles
• Occur as variants of normal (only in few individuals, in addition to the normal bones).
• Can be mistaken as fractures, but are harmless.
• Example: the os trigonum behind the talus, the accessory navicular.
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Growth of bone• Long bones grow from the epiphyseal plate
(growth plate) at each end.
• Both ends grow, but generally one end will grow faster than the other.
• Example: distal epiphysis of the femur & proximal epiphysis of the tibia contribute roughly 60% of limb length, but proximal epiphysis of the humerus contribute 80% of humeral length.
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Muscles
• Agonists and antagonists oppose each other, but still work as balanced groups.
• Muscles are contained within FascialCompartments.
• Swellingcompartment pressure
ischaemic pain
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Forearm compartments
• Ventral compartment: median & ulnar nervesRadial & ulnar arteries
• Dorsal compartment:Less common and less seriousPosterior interosseous nerve
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Lower limb compartments
• Anterior (tibial) compartment: Deep peroneal nerveAnterior tibial artery
• Lateral (peroneal) compartment:Superficial peroneal nerveRarely affected by compression
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Lower limb compartments
• Superficial posterior compartment: Gastrocnemius & soleus musclesNo important nerves or vessels
• Deep posterior compartment:Posterior tibial vessels and nervesPeroneal arterySerious consequences if damaged
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Tendons
• Muscle action depends on the direction of its tendon.
• Tendons do not tolerate frictionprotected by bursae or synovial sheets
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Nerves
Root lesions(e.g., disc prolapse,
spinal injury)
Peripheral nerves(e.g., ulnar neuritis,
median nerve compression)
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Vulnerable peripheral nervesUpper limb
• Median nerveMost common: compression at the wrist (carpal tunnel)Fluid retention in pregnancyRepetitive movement (flexor tenosynovitis)Sensory distribution: thumb, index, and middle fingers, half the ring finger
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Vulnerable peripheral nervesUpper limb
• Ulnar nerve:Most common: irritation at the elbowSensory distribution: little finger & ulnar half of the ring finger
• Radial nerve:Vulnerable in the medial side of the upper arm (e.g., axillary crutches)Drop wrist (few sensory symptoms)
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Vulnerable peripheral nervesLower limb
• Sciatic nerve:Posterior dislocation of the hip
• Common peroneal nerve:Trauma causing lesion as the nerve crosses the neck of fibula
• Lumbar nerve rootsProlapsed intervertebral discs