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Suprascapular notch variations: a 3DCT study.

Kazuya Inoue1, Naoki Suenaga, Naomi Oizumi

  • 1Department of Orthopaedic Surgery, Nara Medical University, 840 Shijoutyou, Kashihara, Nara, 634-5822, Japan, kaz_inoue12@ybb.ne.jp.

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Suprascapular notch shape variations are linked to aging, with ossification of the transverse scapular ligament increasing with age. Three-dimensional CT imaging aids in understanding these anatomical differences for surgical considerations.

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Area of Science:

  • Orthopedic Surgery
  • Radiology
  • Anatomy

Background:

  • Cadaveric studies indicate variations in suprascapular notch (SSN) shape.
  • Limited research exists on the association between SSN variations, age, and gender.
  • Understanding SSN morphology is crucial for procedures involving the suprascapular nerve.

Purpose of the Study:

  • To investigate SSN shape variations using three-dimensional computed tomography (3DCT).
  • To determine if SSN variations are associated with patient age or gender.

Main Methods:

  • Analysis of 3DCT images from 762 shoulders (404 male, 358 female; average age 58.2 years).
  • Classification of SSN shape variations into six types based on Rengachary's classification.
  • Statistical analysis to assess associations between SSN types, age, and gender.

Main Results:

  • Prevalence of SSN types: Type I (11.4%), Type II (23.5%), Type III (30.1%), Type IV (14.8%), Type V (15.9%), Type VI (4.3%).
  • Significant age differences observed between non-ossified (Types I-IV) and ossified (Types V-VI) SSN groups.
  • No statistically significant gender differences found in SSN type distribution or ossification status.

Conclusions:

  • Transverse scapular ligament ossification is associated with aging.
  • Individual anatomical variation accounts for differences among non-ossified SSN types.
  • 3DCT imaging is valuable for assessing SSN variations, informing arthroscopic procedures.