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Comparison of Ankle Joint Visualization Between the 70° and 30° Arthroscopes: A Cadaveric Study
Ichiro Tonogai1,2,3, Fumio Hayashi1,2,3, Yoshihiro Tsuruo1,2,3
1Department of Orthopedics (IT, FH, KS) and.
Foot & Ankle Specialist
|September 28, 2017
Summary
A 70° arthroscope offers superior ankle joint visualization compared to a 30° scope, particularly for posterior osteochondral lesions (OCLs) in the medial talar gutter. This improved view aids in accurate debridement and removal of tibial impediments during ankle arthroscopy.
Area of Science:
- Orthopedic Surgery
- Arthroscopy
- Anatomy
Background:
- Ankle arthroscopy is crucial for diagnosing and treating conditions like anterior ankle impingement and osteochondral lesions (OCLs).
- Current practice often uses a 30° arthroscope, but visualization of certain ankle joint areas, especially posterior OCLs, can be challenging.
Purpose of the Study:
- To compare the visualization capabilities of 70° and 30° arthroscopes within the ankle joint.
- To evaluate the effectiveness of a 70° arthroscope for visualizing specific anatomical structures and pathologies.
Main Methods:
- Anatomic study using a fresh 77-year-old male cadaveric ankle.
- Standard anterolateral and anteromedial portals were utilized with 4-mm 70° or 30° angled arthroscopes.
- Artificial 5-mm osteochondral lesions (OCLs) were created at anterior, mid, and posterior locations of the medial talar gutter.
Main Results:
- The 70° arthroscope provided clearer visualization of the posterior OCL in the medial talar gutter compared to the 30° arthroscope.
- The 70° scope offered immediate visualization of the anterior distal tibia, facilitating a comprehensive view.
Conclusions:
- A 70° arthroscope significantly enhances ankle joint visualization, especially for posterior medial talar gutter OCLs.
- This improved visualization may lead to more accurate, safe, and complete debridement and surgical interventions for anterior distal tibial bony impediments.
