Patellofemoral Instability

Explanation of Diagnosis

Patellofemoral instability means your kneecap (patella) is not tracking and staying in its normal position in the groove of the thigh bone (femur). This can happen when the kneecap partially shifts (subluxes) or fully moves out of place (dislocates), often during twisting, deep bending, or quickly changing directions. Common symptoms include a feeling of “giving way,” shifting, catching, or pain around the front of the knee, sometimes with swelling after an episode. It is usually influenced by a combination of kneecap alignment, muscle control (especially hips and quadriceps), and movement mechanics.

Specific Work Modifications

• Avoid frequent deep knee bending, kneeling, and squatting; use a stool or raised platform when possible.
• Limit twisting on a planted foot; turn your whole body by moving your feet instead.
• If your job requires standing, alternate positions every 30 to 60 minutes and take short walk breaks on level ground.
• Use supportive footwear and consider a cushioned insole to reduce repetitive impact and irritation.
• Set up your workstation so you can keep knees around a comfortable, mid-range angle rather than repeatedly bending deeply.
• If you must climb stairs, use the handrail and take one step at a time; avoid rushing.

Specific Activity Modifications

• Avoid running, jumping, and hard cutting/pivoting until your knee feels stable with everyday activities.
• Reduce or pause activities that repeatedly trigger symptoms such as deep squats, lunges, kneeling, and stairs done repeatedly.
• Choose lower-stress cardio first, like walking on flat ground, stationary cycling with a comfortable seat height, or swimming.
• When you return to sports or classes, start with smaller ranges of motion and avoid “max effort” movements that provoke giving way.
• If you use a strength routine, temporarily avoid heavy leg extensions, deep leg press, and heavy resistance that causes front-of-knee pain or shifting.

Recommended Supplements

None

Recommended Nutrition and Hydration

Diet Recommendations

• Aim for a balanced diet with adequate protein from foods like eggs, fish, poultry, beans, yogurt, or tofu to support tissue repair.
• Emphasize fruits and vegetables and healthy fats (such as olive oil, nuts, and fatty fish) which may help with normal inflammation control.
• Try to limit ultra-processed foods and excess added sugar, especially if you notice swelling or flare-ups after diet changes.
• Maintain a steady, healthful weight since extra load on the knee can increase patellofemoral stress.

Hydration Tips

• Drink water regularly throughout the day, especially if you are active or in a warm environment.
• Use thirst as a guide and check that your urine is typically light yellow rather than dark.

Home Exercise Prescription

Perform these exercises 4 to 5 days per week, using a pain-guided approach and stopping if symptoms sharply worsen.

1. Quad set (isometric): Sit with your knee straight, gently tighten your thigh muscle, hold 10 seconds, relax, repeat 10 times.
2. Straight-leg raise with quad control: Lie on your back, tighten the thigh of the working leg, lift the leg 12 to 18 inches (or as high as you can without pain), lower slowly; 8 to 12 repetitions.
3. Side-lying hip abduction: Lie on your side, keep toes pointing forward, lift the top leg about 12 inches, pause briefly, and lower slowly; 10 to 15 repetitions.
4. Clamshells: With knees bent and hips stacked, open your knees by lifting the top knee without rolling backward; 12 to 15 repetitions.
5. Glute bridge: Lie on your back with knees bent, tighten your glutes and lift hips until you feel hamstrings/glutes working (no sharp knee pain), hold 3 to 5 seconds, lower slowly; 8 to 12 repetitions.
6. Hip flexor stretch: Half-kneel with the back knee down, gently tuck your pelvis and shift forward until you feel a stretch in the front of the hip; hold 30 to 45 seconds each side.

Helpful Books

• "Explain Pain" written by David Butler and Lorimer Moseley
• "Becoming a Supple Leopard" written by Kelly Starrett