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Redefining the costal margin: A pilot study.

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Summary
This summary is machine-generated.

The tenth rib is frequently a "floating" rib, lacking attachment to the ninth rib. Internal subluxation and hooked tips of the tenth rib may increase the risk of developing slipped rib syndrome.

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Area of Science:

  • Anatomy
  • Thoracic Surgery

Background:

  • Classical rib anatomy describes false ribs (7-10) fusing to form the costal margin.
  • Slipped rib syndrome involves false rib subluxation causing intercostal nerve impingement.

Purpose of the Study:

  • To investigate the anatomical variations of the costal margin, specifically the ninth and tenth ribs.
  • To determine the incidence of findings that may predispose individuals to slipped rib syndrome.

Main Methods:

  • Dissection and evaluation of the costal margins of 40 cadavers.
  • Assessment of ninth and tenth rib mobility and attachments by experienced anatomists and surgeons.
  • Standardized criteria and video review for evaluating rib tip mobility and subluxation.

Main Results:

  • The ninth rib consistently attached to the eighth rib (100%).
  • The tenth rib was a "floating" rib in 59% of specimens and attached to the ninth rib in only 18%.
  • Tenth rib subluxation occurred in 33%, with hooked tips noted in 10% and associated internal subluxation in 63%.

Conclusions:

  • The tenth rib frequently lacks attachment to the ninth rib, often presenting as a "floating" rib.
  • Internal subluxation and hooked tips of the tenth rib are common findings.
  • These anatomical variations may predispose individuals to slipped rib syndrome.