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Variations in glenoid rim anatomy: implications regarding anchor insertion.

Janne T Lehtinen1, Markus J Tingart, Maria Apreleva

  • 1Harvard Shoulder Service, Department of Orthopedics, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts, USA. janne.lehtinen@khshp.fi

Arthroscopy : the Journal of Arthroscopic & Related Surgery : Official Publication of the Arthroscopy Association of North America and the International Arthroscopy Association
|February 5, 2004
PubMed
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Glenoid rim anatomy varies significantly by position. Understanding these bony angles and morphology is crucial for successful anchor placement during shoulder labral repairs.

Area of Science:

  • Orthopedic Surgery
  • Anatomy
  • Biomedical Engineering

Background:

  • Labral tears are common shoulder injuries.
  • Successful surgical repair of the glenoid labrum is essential for shoulder stability.
  • Accurate anchor placement is critical for effective labral repair.

Purpose of the Study:

  • To investigate the normal bony anatomy of the glenoid rim.
  • To define optimal angles for anchor placement in anterior and posterior labral repairs.

Main Methods:

  • Anatomical study utilizing 20 cadaveric shoulder specimens.
  • Peripheral quantitative computed tomography (pQCT) was used to obtain cross-sectional glenoid images in four planes.
  • Glenoid rim angles and morphology were measured at five key positions (3, 4:30, 6, 7:30, and 9 o'clock).

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Main Results:

  • Glenoid rim angles varied significantly by position, ranging from 45° ± 7° (4:30 o'clock) to 80° ± 10° (6 o'clock).
  • Asymmetric glenoid morphology was observed, with differences noted between anterior and posterior aspects (e.g., straight rim at 3 o'clock vs. concave at 9 o'clock).
  • Bone mass availability for anchor insertion differs based on glenoid rim location.

Conclusions:

  • Glenoid rim anatomy is position-dependent.
  • Both the rim angle and glenoid morphology must be considered for selecting ideal anchor insertion angles.
  • This data can guide surgeons in optimizing anchor placement for anterior and posterior labral repairs.