Glenoid bare spot
Citation, DOI & article data
Glenoid bare spot also known as glenoid bare area is a small central or slightly eccentric area of inferior glenoid fossa, where the articular cartilage is markedly thinner or completely absent 2. It is considered to be a normal aging-related phenomenon 1.
Glenoid bare spot can be found in as much as 80-88% of adult cadavers 1,3.
It is almost never observed in children younger than 10 years old 4,5 and not at all in fetuses 8. Its incidence seems to increase with age.
The etiology of bare area is not fully understood - it was previously speculated that it is an acquired lesion due to repetitive stress 2,4,8. Recently, a developmental origin associated with fusion of glenoid ossification centers has been proposed 5.
It is a small (2-12mm of range), roughly round area of thinned cartilage that is located in the very center of inferior glenoid fossa 4,7 or slightly anterior to it 3,6. It is best appreciated using fluid-sensitive sequences like T2 FSE in coronal and axial planes.
It should not be accompanied by any pathologic changes of the underlying bony glenoid.
It is considered to be a normal aging-related phenomenon and should not be mistaken for cartilage ulceration or osteochondral defect.
Tubercle of Assaki is a similar phenomenon found in the same location as the bare spot.
- 1. Alashkham A, Alraddadi A, Soames R. Bare spot and tubercle of Assaki. (2017) JSES open access. 1 (3): 141-143. doi:10.1016/j.jses.2017.07.005 - Pubmed
- 2. Warner JJ, Bowen MK, Deng XH, Hannafin JA, Arnoczky SP, Warren RF. Articular contact patterns of the normal glenohumeral joint. J Shoulder Elbow Surg. 1998;7(4):381-388. doi:10.1016/s1058-2746(98)90027-1 - Pubmed
- 3. Cresswell TR, de Beer JF, Du Toit D.The position of the ‘bare spot’ – not central in the glenoid. SA Orthopaedic Journal Spring 2008 / Page 37 https://api.semanticscholar.org/CorpusID:135255358
- 4. Kim H, Kim EK, Kim SS, Kim. Bare spot of the glenoid fossa in children: incidence and MRI features. (2010) Pediatric radiology. doi:10.1007/s00247-009-1494-0 - Pubmed
- 5. Djebbar S, Djebbar RZ, Djebbar FAE, Djebbar AC, Djebbar ZJ, Djebbar RI, Djebbar. Imaging features of glenoid bare spot in a pediatric population. (2018) Skeletal radiology. doi:10.1007/s00256-017-2755-x - Pubmed
- 6. Aigner F, Aigner LS, Aigner FH, Aigner KF, Aigner. Anatomical considerations regarding the "bare spot" of the glenoid cavity. (2004) Surgical and radiologic anatomy : SRA. doi:10.1007/s00276-003-0217-8 - Pubmed
- 7. Burkhart SS, Debeer JF, Tehrany AM, Parten PM. Quantifying glenoid bone loss arthroscopically in shoulder instability. Arthroscopy. 2002;18(5):488-491. doi:10.1053/jars.2002.32212 doi:10.1053/jars.2002.32212
- 8. Tena AJ, Tena BAC, Tena PFJ, Tena MGlJ, Tena. Arthroscopic study of the shoulder joint in fetuses. (2005) Arthroscopy : the journal of arthroscopic & related surgery : official publication of the Arthroscopy Association of North America and the International Arthroscopy Association. doi:10.1016/j.arthro.2005.05.013 - Pubmed i