Quadricepsplasty for Patellar Obligate (Habitual) Lateral Flexion Dislocation

Area of Science:

• Orthopedic surgery
• Biomechanics of the knee

Background:

• Patellar instability has diverse causes, including bone and soft tissue issues.
• Obligate flexion dislocation involves lateral patellar dislocation with knee flexion, often due to extensor mechanism contracture.

Purpose of the Study:

• To describe a quadricepsplasty technique for managing obligate flexion dislocation.
• To detail the surgical steps for realigning proximal soft-tissue attachments of the patella.

Main Methods:

• The technique involves isolating the four quadriceps muscles.
• Specific steps include lengthening the vastus lateralis, advancing the vastus medialis obliquus, and Z-lengthening the rectus femoris and vastus intermedius.
• This procedure can be performed alone or combined with other surgeries like medial patellofemoral ligament reconstruction.

Main Results:

• Quadricepsplasty effectively addresses the extensor mechanism imbalance in obligate flexion dislocation.
• The described technique offers a method for surgical correction of complex patellar instability.
• Combined procedures can comprehensively manage patellofemoral maltracking.

Conclusions:

• Quadricepsplasty is a clinically useful surgical option for obligate flexion dislocation.
• This technique provides a structured approach to realign the extensor mechanism.
• It can be adapted for various patellar instability cases, including those requiring combined surgical interventions.