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Saddle Joint
From WikiMSK
A saddle joint is an articulation between two bones that are saddle-shaped, or concave in one direction and convex in another. It is a type of Synovial Joint. This type of joint is biaxial, and one example is the first carpometacarpal joint between the trapezium (carpal) and the first metacarpal bone of the thumb. This arrangement permits the thumb to flex and extend (within the plane of the palm) as well as abduct and adduct (perpendicular to the palm). This dexterity gives humans the characteristic trait of āopposableā thumbs.[1]
List of Saddle Joints
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Synovial Joint | Bones | Ligaments | Muscles | Innervation | Vasculature | ROM | Volume |
---|---|---|---|---|---|---|---|
First Carpometacarpal Joint (Trapeziometacarpal Joint) | Metacarpal Trapezium | Capsule, anterior oblique, ulnar collateral, first intermetacarpal, posterior oblique, dorsoradial ligaments. | Lateral antebrachial cutaneous nerve, palmar cutaneous branch of the median nerve, superficial radial nerve | First dorsal metacarpal branch of the radial artery | 53Ā° of flexion/extension, 42Ā° of abduction/adduction, and 17Ā° of rotation | ||
Knee Joint | Tibia Femur Patella | Popliteal nerve, tibial nerve | Genicular branches of the popliteal artery | Mainly sagittal plane: 3Ā° of hyperextension to 155Ā° of flexion | |||
Sternoclavicular Joint | Clavicle Rib 1 Manubrium | Sternoclavicular, costoclavicular, interclavicular ligs. | Medial supraclavicular (C3-4) and subclavian (C5-6) nn. | Internal thoracic and suprascapular aa. (branches of the subclavian a.) | 35Ā° in the horizontal and coronal planes, 70Ā° range of motion anteroposteriorly, 50Ā° of rotation along its long axis. |
References
- ā Juneja, Pallavi; Munjal, Akul; Hubbard, John B. (2022). "Anatomy, Joints". Treasure Island (FL): StatPearls Publishing. PMID 29939670. Cite journal requires
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