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Outline

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  • The Knee Joint

    Structure

    Menisci

    Patellofemoral Joint

    Ligaments of the Knee

    Movements

  • Muscles of the Knee Joint

    Location

    Characteristics and Functions of Individual Muscles

  • Muscular Analysis of the Fundamental Movements of the Leg at the Knee Joint

    Flexion

    Extension

    Outward Rotation of the Tibia

    Inward Rotation of the Tibia

  • The Ankle and the Foot

    Structure of the Ankle

    Ligamentous Reinforcement

    Structure of the Foot

    Movements of the Foot at the Ankle, Tarsal, and Toe Joints

  • Muscles of the Ankle and Foot

    Location

    Characteristics and Functions of Individual Muscles

  • Muscular Analysis of the Fundamental Movements of the Ankle and Foot (Tarsal Joints and Toes)

    The Ankle

    The Tarsal Joints

    The Toes (Exclusive of the Intrinsic Muscles)

    Maintenance of the Arches

  • Common Injuries of the Leg, Knee, Ankle, and Foot

    The Leg

    The Knee

    The Ankle

    The Foot

  • Laboratory Experiences

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Objectives

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At the conclusion of this chapter, the student should be able to:

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  1. Name, locate, and describe the structure and ligamentous reinforcements of the articulations of the knee, ankle, and foot.

  2. Name and demonstrate the movements possible in the joints of the knee, ankle, and foot, regardless of starting position.

  3. Name and locate the muscles and muscle groups of the knee, ankle, and foot, and name their primary actions as agonists, stabilizers, neutralizers, or antagonists.

  4. Analyze the fundamental movements of the lower leg and foot with respect to joint and muscle actions.

  5. Describe the common injuries of the leg, knee, and ankle.

  6. Perform an anatomical analysis of the lower extremity in a motor skill.

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The Knee Joint

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The knee joint is the largest and most complex joint in the human body. It is a masterpiece of anatomical engineering. Placed midway down each supporting column of the body, it is subject to severe stresses and strains in its combined functions of weight bearing and locomotion. To take care of the weight-bearing stresses, it has massive condyles; to facilitate locomotion, it has a wide range of motion; to resist the lateral stresses due to the tremendous lever effect of the long femur and tibia, it is reinforced at the sides by strong ligaments; to combat the downward pull of gravity and to meet the demands of such violent locomotor activities as running and jumping, it is provided with powerful musculature. It would be difficult, indeed, to find a mechanism better adapted for meeting the combined requirements of stability and mobility than the knee joint.

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Structure

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Although the knee is classified as a hinge joint, its bony structure resembles two condyloid or ovoid joints lying side by side, yet not quite parallel (Figure 8.1). The lateral flexion permitted in a single ovoid joint is not possible in the knee joint because of the presence of the second condyle. The two rockerlike condyles of the femur rest on the two slightly concave ...

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