Abstract:
BACKGROUND:Osteochondroma is a benign tumor that occurs mainly at the metaphysis of long bones and seldom arises from carpal bones. We describe an extremely rare case of osteochondroma of the hamate without a typical cartilaginous cap and with a spiky bony protrusion in an elderly patient. CASE PRESENTATION:A 78-year-old right-handed female housekeeper had a multilobed osteochondroma of the hamate, which caused carpal tunnel syndrome and irritation of the flexor tendons. Radiological examinations showed a morphological abnormality of the hamate comprising a spiky bony protrusion into the carpal tunnel and a free body proximal to the pisiform. Open carpal tunnel release and resection of the spiky bony protrusion on the hook of the hamate were performed. The flexor digitorum profundus tendons of the ring and little fingers displayed synovitis and partial laceration in the carpal tunnel. Histological examination also showed atypical findings: only a few regions of cartilaginous tissue were seen in the spiky bony protrusion, whereas the free body proximal to the pisiform contained thick cartilaginous tissue such as a cartilaginous cap typical of osteochondroma. We speculated that the bony protrusion to the carpal tunnel had been eroded by mechanical irritation caused by gliding of the flexor tendon and had resulted in the protruding spiky shape with less cartilaginous tissue. The fractured cartilaginous cap had moved into the cavity within the carpal tunnel proximal to the pisiform and had become a large free body. CONCLUSIONS:Osteochondroma of the carpal bone may take various shapes because the carpal bone is surrounded by neighboring bones and tight ligaments, which can restrict tumor growth. This type of tumor is likely to present with various symptoms because of the close proximity of important structures including nerves, tendons, and joints. The diagnosis of osteochondroma of the carpal bone may be difficult because of its rarity and atypical radiological and histological findings, such as the lack of a round cartilaginous cap. We suggest that surgeons should have a detailed understanding of this condition and should make a definitive diagnosis based on the overall findings.
journal_name
BMC Musculoskelet Disordjournal_title
BMC musculoskeletal disordersauthors
Motomiya M,Sakazaki T,Iwasaki Ndoi
10.1186/s12891-020-03272-8subject
Has Abstractpub_date
2020-04-13 00:00:00pages
231issue
1issn
1471-2474pii
10.1186/s12891-020-03272-8journal_volume
21pub_type
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journal_title:BMC musculoskeletal disorders
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pub_type: 杂志文章
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pub_type: 杂志文章,随机对照试验
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pub_type: 临床试验,杂志文章
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pub_type: 杂志文章,随机对照试验
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更新日期:2010-12-13 00:00:00
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pub_type: 杂志文章
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更新日期:2019-04-09 00:00:00
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pub_type: 杂志文章,meta分析,评审
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pub_type: 杂志文章
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