Related Experiment Videos
Subtalar stress radiography using forced dorsiflexion and supination
T Ishii1, S Miyagawa, T Fukubayashi
1University of Tsukuba, Japan.
The Journal of Bone and Joint Surgery. British Volume
|January 1, 1996
Summary
A new stress radiography technique accurately detects subtalar joint instability. This method, using forced ankle dorsiflexion, shows significantly greater talar displacement in patients with recurrent ankle sprains compared to healthy individuals.
Area of Science:
- Orthopedic Surgery
- Radiology
- Sports Medicine
Background:
- Subtalar joint instability is a common complication of ankle injuries.
- Accurate diagnosis of subtalar instability is crucial for effective treatment and rehabilitation.
Purpose of the Study:
- To introduce and evaluate a novel stress radiography method for assessing subtalar joint instability.
- To compare talar displacement in patients with recurrent ankle sprains versus healthy controls.
Main Methods:
- A new stress radiography technique involving forced maximum dorsiflexion in a supinated position was developed.
- Lateral radiographic views were used to measure talar process transposition at the posterior subtalar joint.
- Measurements were taken in normal amputated ankles, healthy control subjects, and patients with recurrent ankle sprains.
Main Results:
- Patients with recurrent ankle sprains exhibited mean talar displacement of 43.0% (n=24).
- Control groups (n=36) showed significantly less mean displacement at 29.9%.
- Ligamentous integrity in amputated specimens correlated with normal subject movement, while ligamentous sectioning mimicked patient findings.
Conclusions:
- The novel stress radiography method is simple and effective for diagnosing subtalar instability.
- This technique can differentiate between stable and unstable subtalar joints, aiding clinical decision-making.
- Findings highlight the role of specific ligaments in maintaining subtalar joint stability.