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A new method to evaluate glenoid erosion in instable shoulder.
Roberto Y Ikemoto1, Joel Murachovsky, Luis G Nascimento
1Department of Orthopaedics and Traumatology, Faculdade de Medicina do ABC, Av, Príncipe de Gales, 821,, 09060-650 Santo Andre, SP, Brazil. rob.ike@hotmail.com.
International Archives of Medicine
|October 19, 2013
Summary
Computerized tomography (CT) provides reliable measurements for quantifying glenoid cavity erosion in shoulder instability. These CT-derived values are consistent with existing literature, aiding in diagnosis.
Area of Science:
- Orthopedics
- Radiology
- Medical Imaging
Background:
- Shoulder instability often involves erosion of the glenoid cavity.
- Accurate quantification of this erosion is crucial for diagnosis and treatment planning.
Purpose of the Study:
- To establish reference values for glenoid cavity dimensions using multislice axial computerized tomography (CT).
- To quantify glenoid cavity erosion in patients with shoulder instability.
- To compare CT measurements with arthroscopic findings.
Main Methods:
- Two groups were studied: normal subjects (Group I) and patients with shoulder instability (Group II).
- Axial CT scans were used to measure vertical, superior horizontal, medial, and inferior segments of the glenoid cavity.
- The ratio of superior to inferior horizontal segments was calculated for both groups.
Main Results:
- Normal subjects had mean values of 40.87 mm (vertical), 17.86 mm (superior horizontal), 26.50 mm (medial), 22.86 mm (inferior), and a ratio of 0.79.
- Subjects with shoulder instability showed mean values of 37.33 mm (vertical), 20.83 mm (superior horizontal), 23.07 mm (medial), and a ratio of 0.91.
- Arthroscopic measurement indicated an inferior segment loss of 17.57% in unstable shoulders.
Conclusions:
- Computerized tomographic measurements of the glenoid cavity provide reliable data for assessing erosion.
- CT-derived values are consistent with established literature.
- CT measurements should not be directly compared with arthroscopic measurements.
