🔥 Bursitis, Tendinitis, and Inflammation

Overview of Inflammatory Joint Conditions

Bursitis and tendinitis are common joint disorders characterized by inflammation. Both conditions often present with identical symptoms, such as pain, swelling, and reduced mobility. The inflammatory response can cause fluid buildup in the affected area. Treatment typically involves reducing joint/muscle use to alleviate pain.

• Bursitis: Inflammation of the bursa (fluid-filled sac that reduces friction).

• Tendinitis: Inflammation of a tendon (connects muscle to bone).

• Symptoms: Pain, swelling, limited movement.

• Treatment: Rest, anti-inflammatory medications, physical therapy.

🧬 Stability vs. Mobility Trade-off

Joint Stability and Mobility Relationship

Joints in the human body balance stability and mobility. The relationship is inversely proportional: as mobility increases, stability decreases, and vice versa.

• Key Principle: Increased mobility always results in decreased stability, and vice versa.

💪 Three Factors for Healthy Synovial Joints

Maintaining Joint Health

• Muscle Tone: Muscles crossing joints provide motion and stability. Toned muscles help hold joints together, reducing joint pain in knees, elbows, and shoulders.

• Number of Ligaments: Fewer ligaments = increased range of motion. Hypermobile individuals have fewer ligaments. Ligament number cannot be changed through treatment.

🔄 Joint Movement Types

Classification of Joint Movements

Joints are classified by the type and plane of movement they allow.

Uniaxial Joints

Special Rotational Movements

• Supination: Palm faces forward/anterior (offering soup).

• Pronation: Palm faces backward/posterior (showing ring).

Biaxial Joints

Multi-Axial Joints

• Shoulder and hip joints allow movement in multiple planes: flexion/extension, abduction/adduction, protraction/retraction, elevation/depression.

📖 Movement Definitions

Key Terms for Joint Movements

• Abduction: Movement away from midline.

• Adduction: Movement toward midline.

• Flexion: Two bones move closer together.

• Extension: Two bones move farther apart.

• Protraction: Moving a body part forward.

• Retraction: Moving a body part backward.

• Elevation: Moving upward.

• Depression: Moving downward.

Critical Note: Flexion/extension occurs at multiple joints (elbow, knee, shoulder, hip) despite different anatomical orientations.

🦶 Special Movements of the Foot

Dorsiflexion, Plantar Flexion, Inversion, and Eversion

Additional info: The dorsal surface is the top of the foot due to embryonic twisting; your foot rotates during development so the back becomes the front.

🦴 Appendicular Skeleton Overview

Upper vs. Lower Limb Development

• Homologous structures: Upper and lower limbs develop similarly during embryonic development, making them equivalent structures.

• Limb Attachment Differences: Upper limbs: Attached primarily by muscles to axial skeleton. Lower limbs: Attached directly to axial skeleton via pelvic girdle.

🔗 Bone Equivalencies: Upper vs. Lower Limbs

Comparing Limb Bones

• Critical: The leg is "backwards"—your palm is sole and thumb is big toe.

📝 Test Preparation and Exam Content

Study Strategies and Content Areas

• Lab manual is essential for practical exams.

• Atlas has extra information not needed for tests.

• Lab time is study time for both lecture and practical.

Next test covers:

1. Skeletal system

2. Joints

3. Appendicular skeleton

4. Axial skeleton

Application vs. Memorization

• Be ready to identify movements in actions (e.g., "Jumping jacks involve what motions?").

• Lower limbs attach laterally for stability during bipedal locomotion.

• Upper limbs prioritize mobility over stability.

🍞 Os Coxae (Pelvic Girdle)

Structure and Composition

The os coxae (plural: ossa coxae) forms the pelvic girdle and is the most complex bone of the appendicular skeleton. It is a composite bone formed by three fused elements:

• Fusion Point: All three bones meet at the acetabulum (socket for femoral head).

Anatomical Orientation

• Lateral: acetabulum

• Anterior: pubis

• Posterior: ischium

🔗 Pelvic Joints

Major Pelvic Connections

• Sacroiliac joint: Forms between sacrum and ilium; features auricular surfaces on both bones.

• Pubic symphysis: Fibrocartilage disc between pubic bones; the disc itself is the joint.

📍 Iliac Spine Landmarks

Important Anatomical Landmarks

• Orientation tip: The greater sciatic notch (candy-cane shaped) is always posterior.

⚫ Other Pelvic Features

Foramina and Notches

• Obturator foramen: Large hole for passage of obturator nerve and blood vessels.

• Greater sciatic notch: Superior notch below iliac spine.

• Lesser sciatic notch: Inferior notch below ischial spine.

• Ischial spine: Bony projection between sciatic notches.

✏️ Sex Differences in Pelvic Anatomy

Visual Identification Features

Functional Adaptations

• Quick assessment: Make a fist and pass through pubic inlet—ample space indicates female pelvis; restricted space indicates male.

🔗 Pelvic Ligaments and Passageways

Ligaments Creating Foramina

Critical Ligaments and Contents

• Obturator membrane: Covers obturator foramen, securing obturator artery, vein, and nerve.

• Inguinal ligament: Extends from anterior superior iliac spine to pubic tubercle, forming border between torso and leg.

• Contents: Femoral artery, vein, nerve, lymphatics, and ductus deferens (males).

• Sciatic nerve: The body's longest nerve—exits through greater sciatic foramen.

🦴 Pectoral Girdle Anatomy

Structure and Attachments

The pectoral girdle consists of scapula and clavicle, forming the shoulder complex.

• Scapula: Positioned posterior to rib cage, attached via muscles rather than direct skeletal connection—providing mobility at the cost of stability.

Key Attachments

• These joints are syndesmosis—connected by ligaments with slight movement but not synovial joints. They primarily function to secure everything in place.

🦴 Clavicle Anatomy

Key Features of the Clavicle

• The clavicle is an S-shaped bone with two distinct curves, unlike ribs which are C-shaped with only one curvature.

• Acromial end: More rounded shape.

• Sternal end: More flat edge.

• Terminology: Learn the specific names acromial and sternal ends.