Patellar dislocation and patellar instability are conditions where the kneecap (patella) slips out of its groove (trochlear groove of the femur), either partially (subluxation) or completely (dislocation). First dislocation typically occurs in adolescence or early adulthood from a twisting or valgus force; recurrent dislocation is a significant problem particularly in patients with trochlear dysplasia, high-riding patella (patella alta), or generalised ligamentous laxity.
Acute Patellar Dislocation: Immediate Walking Aid Needs
After a first patellar dislocation:
- The knee is typically held in extension (the patient cannot bend the knee)
- Significant haemarthrosis (blood in the joint) is common after medial patellofemoral ligament (MPFL) rupture
- Weight-bearing is painful and requires support
- Acute management: reduction (usually spontaneous with knee extension), immobilisation brace, crutches for 1-2 weeks, then progressive rehabilitation
A walking cane becomes appropriate as the acute haemarthrosis resolves and the patient transitions from bilateral crutches to single-side support -- typically 2-4 weeks post-dislocation.
Recurrent Patellar Instability: The Giving-Way Problem
Recurrent patellar instability is characterised by episodes of the kneecap giving way -- a sudden feeling of the knee buckling laterally, with or without full dislocation. These episodes occur unpredictably, particularly with:
- Twisting or pivoting movements
- Stairs (especially descending)
- Uneven terrain
A walking cane for recurrent patellar instability serves as a catch point during giving-way episodes and reduces the confidence-limiting unpredictability of the instability. The cane does not prevent patellar subluxation directly -- a patellar stabilising brace with lateral buttress is the primary mechanical intervention -- but it reduces fall risk when subluxation occurs.
Post-MPFL Reconstruction or Trochleoplasty
Surgical management of patellar instability (MPFL reconstruction, tibial tuberosity transfer, trochleoplasty) involves post-operative restricted weight-bearing:
- Typically 2-4 weeks on crutches followed by single cane phase
- Specific protocol varies by procedure and surgeon preference
Patellar Instability and Walking Aid
| Situation | Walking Aid |
|---|---|
| Acute first dislocation (0-2 weeks) | Bilateral crutches; brace; non- to partial weight-bearing |
| Acute first dislocation (2-6 weeks) | Single cane; progressive weight-bearing; brace |
| Recurrent instability (between episodes) | Patellar brace (primary); cane for outdoor and terrain safety |
| Post-MPFL reconstruction | Crutches (0-2 weeks); single cane (2-6 weeks); no aid (6+ weeks) |
Explore DaiWalk walking canes. Related: Walking Cane for Patellofemoral Pain Syndrome.
