What factors determine the degree of movement at joints? Movement at joints is also determined by (1)
the shape of the articulating bones, (2) the flexibility (tension or tautness) of the ligaments that bind the bones together, and (3) the tension of associated muscles and tendons
. Joint flexibility may also be affected by hormones.
What 4 factors determine the stability of joints?
- Shape of articular surfaces (how close they fit)
- Strength and tension of capsule and ligaments (dependent on position)
- Arrangement and tension of muscles.
- Contact with soft parts such as adipose tissue.
- Hormones.
What factors affect joint range of motion quizlet?
- Structure or shape of the articulating bones.
- Strength and tension (tautness) of the joint ligaments.
- Arrangement and tension of the muscles.
- Contact of soft parts.
- Hormones.
- Disuse.
What is the most important factor that influences stability of a joint?
In most joints,
muscle tone
is the major factor controlling stability. For example, the muscle tone of the short muscles around the shoulder joint keeps the hemispherical head of the humerus in the shallow glenoid cavity. Without the action of these muscles, very little force would be required to dislocate this joint.
What is the most important factor in the stability of a joint?
Tone of Surrounding Muscles
The tone of the surrounding muscles contributes greatly to the stability of a joint. A good example of this is the support provided by the rotator cuff muscles, which keep the head of the humerus in the shallow glenoid cavity of the scapula.
- Gender. …
- Age. …
- Body mass index. …
- Type of disease. …
- Preoperative range of motion. …
- Preoperative flexion deformity and postoperative range of motion. …
- Patella resurfacing and tourniquet protocol. …
- Scores.
Goniometer. Apart from physical examination, ROM evaluation is most frequently performed
using a device called a goniometer
, an instrument that measures the angle at a joint. Goniometers measure range of motion in degrees, from zero to 180 or 360, and come in various shapes and sizes to be used on particular joints.
Range of motion is measured
by your physical therapist using a device called a goniometer
. A goniometer is a metal or plastic handheld device with two arms. Numbers representing angular distance are on the device, much like a protractor.
Ligaments and Labrum
Ligaments, soft tissue structures that connect bone to bone, reinforce the capsule. The capsule and ligaments provide passive stability to the hip joint but allow movements in different planes. The labrum of the hip is a fibrocartilaginous structure that is located at the level of the acetabulum.
Like the gemellus muscles,
the piriformis
rotates the hip laterally.
Two important factors that contribute to the stability of the hip are
the acetabular labrum and the ligamentum teres
.
Joint Stability is defined as the ability to maintain or control joint movement or position. Stability is achieved
by the coordinating actions of surrounding tissues and the neuromuscular system
.
