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Related Experiment Video

Updated: May 22, 2026

A Mouse Model of Ankle-Subtalar Complex Joint Instability

A Mouse Model of Ankle-Subtalar Complex Joint Instability

Published on: October 28, 2022

[Chronic patellofemoral instability].

W Petersen¹, P Forkel, A Achtnich

¹Klinik für Orthopädie und Unfallchirurgie, Martin Luther Krankenhaus, Berlin, Grunewald, Caspar Theyss-Straße 27-31, 14193, Berlin, Deutschland. w.petersen@mlk-berlin.de

Der Unfallchirurg

|May 17, 2012

Summary

This summary is machine-generated.

Chronic patellofemoral instability, characterized by recurrent dislocations, can cause pain and early osteoarthrosis. Treatment strategies are tailored to underlying factors like MPFL elongation or trochlea dysplasia, guiding surgical choices for optimal outcomes.

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Last Updated: May 22, 2026

A Mouse Model of Ankle-Subtalar Complex Joint Instability

A Mouse Model of Ankle-Subtalar Complex Joint Instability

Published on: October 28, 2022

Area of Science:

Orthopedic Surgery
Biomechanics
Radiology

Context:

Chronic patellofemoral instability encompasses recurrent patellar dislocations, subluxations, and chronic dislocations, often leading to pain and osteoarthrosis.
Key contributing factors include medial patellofemoral ligament (MPFL) elongation, patella alta, increased tibial tuberosity to trochlea groove (TTTG) distance, trochlea dysplasia, and torsional malalignment.

Purpose:

To outline the diagnostic approach and surgical indications for chronic patellofemoral instability.
To detail the various surgical techniques based on identified etiological factors.

Summary:

Clinical examination, radiological imaging (including Defilée view and assessment of patella alta), and MRI are crucial for diagnosing the underlying causes.
Surgical interventions are indicated for chronic pain with subluxation, chronic dislocation, and recurrent dislocation, with lateral release now reserved for specific cases (subluxation with positive tilt).
Treatment options range from medial reefing for MPFL elongation to MPFL reconstruction, trochleoplasty for severe dysplasia, and distal realignment (tibial tubercle transfer) for increased TTTG distance or patella alta.

Impact:

This comprehensive approach ensures tailored surgical strategies, optimizing treatment for patients with chronic patellofemoral instability.
Understanding the biomechanical implications of each factor and surgical procedure is vital for improving patient outcomes and preventing further joint degeneration.