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Pisiform bone
The pisiform bone (/ˈpaɪsɪfɔːrm/ or /ˈpɪzɪfɔːrm/), also spelled pisiforme (from the Latin pisiformis, pea-shaped), is a small knobbly, sesamoid bone that is found in the wrist. It forms the ulnar border of the carpal tunnel.
The pisiform is a sesamoid bone, with no covering membrane of periosteum. It is the last carpal bone to ossify. The pisiform bone is a small bone found in the proximal row of the wrist (carpus). It is situated where the ulna joins the wrist, within the tendon of the flexor carpi ulnaris muscle.
It only has one side that acts as a joint, articulating with the triquetral bone. It is on a plane anterior to the other carpal bones and is spheroidal in form.
The pisiform bone has four surfaces:
The etymology derives from the Latin pisum which means "pea" ultimately derived from the Greek "pison" (pea).
The pisiform bone is most recognizable as an unassuming palmar projection forming the heel of human hand.
The pisiform bone, along with the hamulus of the hamate, defines the medial boundary of the carpal tunnel because the pisiform body acts as one of the four attachments points of the flexor retinaculum. It also acts as an attachment site for tendons of the abductor digiti minimi and for the flexor carpi ulnaris - the tendon in which it develops. The pisiform is the only carpal bone with insertions and attachments for the abductor digiti minimi and the flexor carpi ulnaris. It is suggested that due to the pisiform's surprisingly large range of movement along its articulation surface with the triquetral bone (about 1 cm of movement is allowed), contraction of the flexor carpi ulnaris is necessary for the pisiform to remain stable enough for the abductor digiti minimi to function effectively.
In clinical studies, the pisiform has been removed as treatment for osteoarthritis in the pisotriquetral joint. While some studies came to the conclusion that the pisiform "contributes to the stability of the ulnar column of the wrist", others suggested that while excision slightly impairs the range of motion of the wrist (especially wrist extension), the forces generated within the wrist are not significantly impacted. Subjects in the latter study did report impaired function after excision when performing heavy lifting and weightbearing activities, but this is suggested to be subjective considering that they did not have to change occupation or their level of activity as a result of the excision.
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Pisiform bone
The pisiform bone (/ˈpaɪsɪfɔːrm/ or /ˈpɪzɪfɔːrm/), also spelled pisiforme (from the Latin pisiformis, pea-shaped), is a small knobbly, sesamoid bone that is found in the wrist. It forms the ulnar border of the carpal tunnel.
The pisiform is a sesamoid bone, with no covering membrane of periosteum. It is the last carpal bone to ossify. The pisiform bone is a small bone found in the proximal row of the wrist (carpus). It is situated where the ulna joins the wrist, within the tendon of the flexor carpi ulnaris muscle.
It only has one side that acts as a joint, articulating with the triquetral bone. It is on a plane anterior to the other carpal bones and is spheroidal in form.
The pisiform bone has four surfaces:
The etymology derives from the Latin pisum which means "pea" ultimately derived from the Greek "pison" (pea).
The pisiform bone is most recognizable as an unassuming palmar projection forming the heel of human hand.
The pisiform bone, along with the hamulus of the hamate, defines the medial boundary of the carpal tunnel because the pisiform body acts as one of the four attachments points of the flexor retinaculum. It also acts as an attachment site for tendons of the abductor digiti minimi and for the flexor carpi ulnaris - the tendon in which it develops. The pisiform is the only carpal bone with insertions and attachments for the abductor digiti minimi and the flexor carpi ulnaris. It is suggested that due to the pisiform's surprisingly large range of movement along its articulation surface with the triquetral bone (about 1 cm of movement is allowed), contraction of the flexor carpi ulnaris is necessary for the pisiform to remain stable enough for the abductor digiti minimi to function effectively.
In clinical studies, the pisiform has been removed as treatment for osteoarthritis in the pisotriquetral joint. While some studies came to the conclusion that the pisiform "contributes to the stability of the ulnar column of the wrist", others suggested that while excision slightly impairs the range of motion of the wrist (especially wrist extension), the forces generated within the wrist are not significantly impacted. Subjects in the latter study did report impaired function after excision when performing heavy lifting and weightbearing activities, but this is suggested to be subjective considering that they did not have to change occupation or their level of activity as a result of the excision.