When I evaluate Bangladeshi patients with repeated knee cap dislocation, one of the first things I explain is that this problem is not just a painful episode. It often reflects an underlying instability in the way the kneecap, or patella, moves in its groove at the front of the knee. A single dislocation may happen after trauma, but recurrent dislocation usually means the knee needs a more careful assessment of alignment, soft-tissue support, and cartilage health.[1][2]
In simple terms, recurrent dislocation of the patella means the kneecap keeps slipping out of place, most often toward the outer side of the knee. Some patients describe a full dislocation, while others describe the feeling that the kneecap is about to slip, especially when turning, squatting, using stairs, or getting up from the floor. In Dhaka and across Bangladesh, I see this problem in school and college students, athletes, dancers, and also adults who have had repeated knee twisting injuries or long-standing kneecap maltracking.
What Recurrent Patellar Dislocation Means
The patella normally glides in a groove at the lower end of the thigh bone. Stability depends on several things working together:
- the shape of the groove
- the alignment of the leg
- the position of the patellar tendon
- the strength and control of the quadriceps muscles
- the medial patellofemoral ligament, often called the MPFL, which helps prevent the kneecap from slipping too far outward in early knee bending[2]
If one or more of these stabilizers are weak, torn, or anatomically unfavorable, the kneecap can dislocate again and again. After the first episode, the risk of repeat instability rises, especially if the patient has patella alta, trochlear dysplasia, abnormal limb alignment, ligament laxity, or poor muscular control.[2]
Common Symptoms Bangladeshi Patients Notice
In my practice, patients with recurrent patellar dislocation usually report more than one of the following:
- a sudden sideways slip of the kneecap
- a popping sensation during twisting or pivoting
- swelling after an episode
- fear or apprehension when bending the knee
- pain in the front of the knee
- difficulty with stairs, squatting, prayer posture, or sitting cross-legged
- repeated giving way during walking or sport
Some people have a full dislocation that needs reduction, while others develop repeated subluxation, where the kneecap partly slips and comes back. Even if the knee seems to settle after each episode, repeated instability can damage cartilage and increase the risk of future knee pain and early degenerative change.[1][3]
Why This Problem Keeps Happening
Recurrent dislocation is rarely just bad luck. I usually explain to my patients that we must look for the real reason behind the instability. Important contributing factors include:
Injury to the MPFL
The MPFL is the main soft-tissue restraint against lateral patellar instability during the early part of knee flexion. It is commonly injured during patellar dislocation, and if it does not heal well, recurrent instability becomes more likely.[2]
Abnormal Knee Anatomy
A shallow trochlear groove, patella alta, increased Q angle, lateralized tibial tubercle, rotational malalignment, and knock-knee alignment can all make the patella more likely to move out of place.[2][3]
Muscle Weakness and Poor Control
Weakness of the quadriceps, especially the medial stabilizing part of the muscle, can reduce control of patellar tracking. This is very relevant in patients who stop rehabilitation too early or become fearful of movement after the first dislocation.[2]
Recurrent Twisting or Sports Stress
Football, badminton, basketball, running on uneven grounds, slipping on wet floors, and sudden direction changes can trigger repeated episodes in a vulnerable knee.[1][3]
When You Need Proper Evaluation
I recommend a full orthopedic evaluation if:
- the kneecap has dislocated more than once
- the knee remains swollen after an episode
- you cannot fully trust the knee during walking
- you hear locking or catching
- the knee feels unstable during stairs or squatting
- you are an athlete or physically active person trying to return to sport
In Bangladesh, many patients ignore the first few episodes because the kneecap slips back on its own. That is risky. Recurrent patellar instability may be associated with cartilage injury, loose fragments, or damage to the joint surface that can worsen if not identified early.[1][2]
How I Assess Recurrent Knee Cap Dislocation
When I evaluate patients with this problem, I do not focus only on the latest episode. I try to understand the full instability pattern.
Clinical Examination
I assess:
- patellar tracking
- apprehension and instability signs
- alignment of the lower limb
- ligament laxity
- quadriceps strength
- swelling, tenderness, and range of motion
