Institute for Human Movement and Medical Sciences, Niigata University of Health and Welfare, Shimami-cho 1398, Kita-ku, Niigata City, Niigata, 950-3198, Japan.
Division of Gross Anatomy and Morphogenesis, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan.
Surg Radiol Anat. 2024 Sep;46(9):1387-1392. doi: 10.1007/s00276-024-03390-1. Epub 2024 Jun 10.
The suprapatellar bursa is located in the proximal deep layer of the patella and is thought to reduce tissue friction by changing from a single-membrane structure to a double-membrane structure during knee joint motion. However, the dynamics of the suprapatellar bursa have only been inferred from positional relationships, and the actual dynamics have not been confirmed.
Dynamics of the suprapatellar bursa during knee joint motion were observed in eight knees of four Thiel-fixed cadavers and the angle at which the bursa begins to show a double membrane was revealed. The flexion angles of knee joints were measured when the double-membrane structure of the suprapatellar bursa began to appear during knee joint extension.
The suprapatellar bursa changes from a single membrane to a double-membrane structure at 91 ± 4° of flexion, when the knee joint is moved from a flexed position to an extended position.
The suprapatellar bursa may be involved in limitations to knee joint range of motion and pain at an angle of approximately 90°. Further studies are needed to verify whether the same dynamics are observed in living subjects.
髌上囊位于髌骨近端的深层，其在膝关节运动过程中由单膜结构变为双膜结构，被认为可以减少组织摩擦。然而，髌上囊的动力学仅从位置关系推断得出，其实际动力学尚未得到证实。
在 4 例经 Thiel 固定的尸体的 8 个膝关节中观察膝关节运动过程中髌上囊的动力学，并揭示出髌上囊开始呈现双膜的角度。测量膝关节从屈曲位伸展至髌上囊的双膜结构开始出现时的膝关节屈曲角度。
当膝关节从屈曲位移动到伸展位时，髌上囊在 91°±4°的屈曲时由单膜变为双膜结构。
髌上囊可能在大约 90°的角度处限制膝关节的运动范围并引起疼痛。需要进一步的研究来验证在活体中是否观察到相同的动力学。
