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The fourth and fifth metacarpal bones are commonly "blunted" or shortened, in pseudohypoparathyroidism and pseudopseudohypoparathyroidism. A blunted fourth metacarpal, with normal fifth metacarpal, can signify Turner syndrome. Blunted metacarpals (particularly the fourth metacarpal) are a symptom of nevoid basal-cell carcinoma syndrome.
The fourth metacarpal bone (metacarpal bone of the ring finger) is shorter and smaller than the third. The base is small and quadrilateral; its superior surface presents two facets, a large one medially for articulation with the hamate , and a small one laterally for the capitate .
Brachymetacarpia of the third metacarpal (middle finger) Brachymetacarpia or brachymetacarpalia is a medical condition in which the metacarpal bones of the hands are shortened. [ 1 ] The equivalent condition in the foot is brachymetatarsia , in which the metatarsal bones are shortened.
Archibald's sign (also known as Archibald's metacarpal sign) refers to a feature in the hand characterized by a shortening of the fourth or/and fifth metacarpals when the fist is clenched. [ 1 ] [ 2 ] [ 3 ]
The metacarpophalangeal joints (MCP) are situated between the metacarpal bones and the proximal phalanges of the fingers. [1] These joints are of the condyloid kind, formed by the reception of the rounded heads of the metacarpal bones into shallow cavities on the proximal ends of the proximal phalanges. [1]
During osteotomy, the metacarpal is cut and a wedge shape bone fragment is removed to move the bone away from the hand. [35] Postoperative, the thumb of the patient is immobilized using a thumb-cast. Possible complications are non-union of the bone, persistent pain related to unrecognized CMC or pantrapezial disease and radial sensory nerve injury.
A fracture of the fourth and/or fifth metacarpal bones transverse neck secondary due to axial loading is known as a boxer's fracture. [1] [[[Boxer%27s_fracture#{{{section}}}| contradictory]]] The fifth metacarpal bone is the most common bone to be injured when throwing a punch.
Metacarpal synostosis is a rare congenital difference which is characterized by the fusion of 2 (or, in rare cases, more) metacarpals of the hand, which are usually shortened. It is most commonly seen as a fusion of the 4th and 5th metacarpals. It is a type of non-syndromic syndactyly/synostosis. [1]