title: Morphology and morphometry of lateral atlantoaxial joint meniscoids.
abstract: The lateral atlantoaxial joints contain folds of synovium termed meniscoids that may potentially contribute to cervical spine pain; however, the anatomy of these structures has not been comprehensively investigated. The purpose of this study was to explore the morphology and morphometry of lateral atlantoaxial joint meniscoids. Twelve cadaveric hemi-spines (6 female; 6 left; mean 81.5 years, SD 7.3) were obtained for dissection and disarticulation of the lateral atlantoaxial joints. Meniscoids were identified and measurements made of surface area, length, and surrounding articular cartilage degeneration. Tissue was sectioned sagittally, stained with hematoxylin and eosin, and examined by light microscopy. Data were analyzed descriptively and using nonparametric techniques. Ventral and dorsal meniscoids (24 in total) were found in each joint, and could be classified histologically into adipose (32%), fibrous (41%), and fibroadipose (27%) meniscoids. No significant associations were found between meniscoid size and age, histology, cartilage degeneration, or joint position. Meniscoid length in males was significantly greater than in females (P = 0.04). Fibrous meniscoids were noted to be associated with articular cartilage degeneration, and adipose and fibroadipose meniscoids with intact cartilage (P = 0.05). Fibrous meniscoids tended to be located dorsally (78%), whereas adipose meniscoids were mostly located ventrally (86%). Distinct patterns in lateral atlantoaxial joint meniscoid morphology were observed, including the association of fibrous meniscoid composition with dorsal joint position and articular cartilage degeneration. The clinical significance of these patterns remains uncertain, and further research is needed to examine these structures across the lifespan and in cervical pathology.
authors: Faculty of Health and Medicine, The University of Newcastle, HA06 Hunter Building, Callaghan, Newcastle, NSW, 2308, Australia. scott.farrell@newcastle.edu.au.
authors: Scott F
authors: SF
authors: Farrell
authors: Faculty of Health and Medicine, The University of Newcastle, HA06 Hunter Building, Callaghan, Newcastle, NSW, 2308, Australia.
authors: Peter G
authors: PG
authors: Osmotherly
authors: Centre for Society, Governance and Science, Faculty of Law, University of Otago, Dunedin, New Zealand.|Department of Anatomy, University of Otago, Dunedin, New Zealand.|Centre for Health Sciences, Zurich University of Applied Sciences, Zurich, Switzerland.
authors: Jon
authors: J
authors: Cornwall
authors: Faculty of Health and Medicine, The University of Newcastle, HA06 Hunter Building, Callaghan, Newcastle, NSW, 2308, Australia.
authors: Darren A
authors: DA
authors: Rivett
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D001268:Atlanto-Axial Joint / Q000033:anatomy & histology* / Q000473:pathology; D002102:Cadaver; D002574:Cervical Vertebrae; D005260:Female; D006801:Humans; D008297:Male; D010146:Pain / Q000209:etiology; D012727:Sex Characteristics; D013583:Synovial Membrane / Q000033:anatomy & histology / Q000473:pathology
keywords: Anatomy; Atlantoaxial joint; Cervical vertebrae; Meniscoids; Pain; Synovial folds; Synovial membrane