Reading Time: 4 minutes

There space a couple of groups of joint classifications, yet in this post, ns will emphasis on those most familiar: the synovial joints. Synovial joints are identified by the synovial fluid present in the share capsule that helps come lubricate the joint. The security of a joint depends on the shape of the joint itself and its bordering structures. This contains the bones that comprise the joint, cartilage, ligaments, tendons, and also muscles. Cartilage ~ above the bony surfaces that comprise the joint assist to rise the surface ar area of the joint (thereby increasing the stability), and/or cushion the joint. Muscles, tendons, and also ligaments help to create support about the joint. The shape of the bones assist to dictate which movements it will certainly allow.

You are watching: What factor does not contribute to the strength and stability of a synovial joint?

Types that Synovial Joints

Within the group of synovial joints, the form of the articular surface of the joint, and the movement enabled at every joint assist to further failure joint categories.


1. Ball and Socket Joints: these joints allow for the greatest range of motion. The joint requires a ball fitting into a concave surface. Since these joints allow for much more motion, they are at higher risk for instability. Ball and also socket joints allow for motion in many planes, and also circumduction.

The shoulder and also hip room both ball and socket joints.

2. Condyloid Joints: permit for flexion, extension, and some lateral movement at the joint. There is additionally some circumduction the takes place. The circumduction is limited however, since the form of the share is oval contrasted to the an ext mobile ball and socket joints. Fingers should have the ability to move in a one motion, although it is small. Condyloid joints are also referred to as ellipsoidal joints.

The base of every finger is a condyloid joint.

3. Saddle Joints: These joints room made of 2 concave and convex surfaces the intersect. Saddle joints allow for flexion, extension, and also lateral movement. Saddle joints may current as a condyloid joint, yet if you shot to move your ignorance in a perfect circle, girlfriend will notice its movement will no be smooth favor the circular movement possible with a finger.

The base of the ignorance is an instance of a saddle joint.

4. Hinge Joints: Hinge joints permit for motion in one aircraft only. Think that a door hinge. It permits the door to open and also close, yet not move up or down.

Knees and also elbows room some common examples of hinge joints.

5. Pivot Joints: This kind of joint allows for rotation. Unlike numerous other synovial joints, the does not permit for any type of flexion or extension.

The first two cervical skeletal (the atlas & axis) kind a pivot joint. The atlas sit on height of the axis and permits a “no” motion of the head (left & right rotation)


Improving stability

Training the muscles approximately a joint help to boost its stability. The more powerful the muscles, the an ext control they have actually over the activities of the joint. A muscle imbalance can likewise lead to share laxity.

See more: How To Fix Arithmetic Overflow Error Converting Numeric To Data Type Numeric.

Post injury, training will usually involve both flexibility and strength maintain of a joint. The flexibility training is to aid regain or enhance a joint’s selection of movement for day-to-day activities. The stamin training is both to aid with functional motions alongside building and also maintaining joint stability.

For example, i dislocated my shoulder in the autumn of 2014. Ns performed range of motion and also strength exercises to regain my functionality. Together I progressed, i was able to execute exercises with a broader range of motion to proceed improving mine stability. The exercises additionally involved countless directions that movement. Training mine shoulder this method absolutely brought up the stability (and is still helping to store it stable). Plainly it will always be at danger for some instability injuries, but training that safely helps me to avoid such instances!



In my last blog post, ns explored hypermobility that joints. Overstretching a joint deserve to decrease its all at once stability, and also overtraining a joint without stretching deserve to decrease its range of motion. Over there is constantly a happy medium between stretching and also training the muscles because that your finest function. Together always, make certain you big what you strengthen and also strengthen what you stretch!


Adrienne Lema BPE Student


1. Classification of Joints top top the basis of Structure and also Function. Boundless Biology. Boundless, (21 Jul. 2015). Re-cover 30 Jul. 2015 from

2. Joints of the Skeleton, , Retrieved native

Image References:

1. Joints, Gelenke Zeichnung, (2005) Retrieved from Lema, Adrienne (2014)3. Lema, Adrienne (2014)4. Lema, Adrienne (2014)

ball and socketcondyloid jointhinge jointimprove joint stabilityjoint classificationjoint stabilitypivot jointsaddle jointsynovial joint