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Updated: May 10, 2026

Three-Dimensional Preoperative Virtual Planning in Derotational Proximal Femoral Osteotomy

Three-Dimensional Preoperative Virtual Planning in Derotational Proximal Femoral Osteotomy

Published on: February 17, 2023

Patellar dislocation with genu valgum treated by DFO.

Jae Ho Kwon, Jong In Kim, Dong-Hyun Seo

|June 11, 2013

Summary

Congenital habitual patellar dislocation, a rare knee condition, involves the kneecap dislocating during bending. This case study details surgical correction for a woman with recurring bilateral dislocations after prior failed procedures.

Related Experiment Videos

Last Updated: May 10, 2026

Three-Dimensional Preoperative Virtual Planning in Derotational Proximal Femoral Osteotomy

Three-Dimensional Preoperative Virtual Planning in Derotational Proximal Femoral Osteotomy

Published on: February 17, 2023

Area of Science:

Orthopedics
Pediatric Orthopedics
Sports Medicine

Background:

Congenital habitual patellar dislocation is a rare knee condition characterized by permanent, irreducible patellar dislocation present at birth.
It is associated with a short quadriceps, significant patellofemoral dysplasia, and short stature.
This condition often presents with genu valgus and lateral joint pain.

Observation:

A 27-year-old woman presented with recurring bilateral habitual patellar dislocation despite previous failed realignment surgeries.
Clinical examination revealed genu valgus knees and persistent lateral joint pain.
Radiographs confirmed bilateral patellar dislocation, genu valgum, patellofemoral dysplasia, and lateral compartment osteoarthritis.

Findings:

Preoperative standing radiographs indicated significant valgus deformities (anatomic: R 13°, L 6°; mechanical: R 8°, L 2°) and altered weight-bearing lines (R 65%, L 48%).
The surgical intervention involved a distal femoral closing wedging osteotomy to correct the valgus deformity.
Simultaneously, percutaneous lateral release and medial reefing were performed to stabilize the patellas bilaterally.

Implications:

This combined surgical approach effectively addressed both the underlying valgus deformity and patellar instability in a complex case.
The successful management highlights a potential treatment strategy for recurrent patellar dislocations secondary to significant genu valgum and dysplasia.
Further research could explore long-term outcomes and compare this technique with other surgical options for congenital patellar instability.