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Dynamics of the suprapatellar bursa during knee joint extension. | LitMetric

AI Article Synopsis

  • The suprapatellar bursa is located near the knee and helps reduce friction during movement by changing from a single-membrane to a double-membrane structure.
  • Research was conducted on cadaver knees to observe the dynamics of this bursa and determine the flexion angle at which the double-membrane structure appears.
  • Findings indicate that this change occurs at about 91° of knee flexion, suggesting the bursa could affect knee movement and pain near this angle, warranting further research in living subjects.

Article Abstract

Purpose: 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.

Methods: 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.

Results: 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.

Conclusion: 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.

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Source
http://dx.doi.org/10.1007/s00276-024-03390-1DOI Listing

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