Patellar syndrome: comprehensive understanding and endoscopic treatment
In this presentation, Dr. Vallotton describes patellar syndrome as a functional pathology linked to global imbalances. He emphasizes the importance of a broad diagnosis and an adapted therapeutic approach, including rehabilitation, podiatry, and in some cases, endoscopic surgical treatment of the flexor hallucis tendon.
Doctors
Topics
Treatments
Advice
- Dr Jacques Vallotton
- Definition of patellar syndrome
- Biomechanical analysis
- Allux limitus
- Conservative treatment
- Endoscopic athenolysis
- Functional rehabilitation
- Endoscopic athenolysis
- Anterior pain without visible lesion
- Foot-hip-knee connection
- Priority conservative treatment
- Athenolysis for rebellious cases
- Role of the big toe in overall mechanics
Patellar syndrome: defining the clinical framework
Patellar syndrome is defined as anterior, mechanical knee pain occurring during exercise without trauma or instability and without anatomical lesions correlated with imaging. It represents a large proportion of consultations in young adults and athletes. The examination looks for pain in the posteromedial facet of the patella, effusions during exercise and tension in the peri-patellar structures.
Because it is a functional disorder, the analysis is not limited to the knee: the above- and below-knee segments (hip, foot, spine) influence patellar kinematics. Making a diagnosis of "patella wear" from the outset exposes patients to therapeutic impasses.
Understanding the mechanics: hip, foot and medial collapse
Analysis of gait and functional movements (forward lunge, step-down) frequently reveals weakness of the hip abductors, a tendency toward internal rotation, and a medial collapse of the knee during the stance phase. At the same time, the foot often exhibits excessive supination-pronation alternation, with offset loading. These imbalances alter the timing of quadriceps contraction and increase patellofemoral stress.
Functional assessment, ideally on an instrumented mat or by podiatrist, makes it possible to objectify these patterns and monitor the effect of interventions.
Patellar syndrome is a global functional imbalance rather than a local knee problem.
Role of functional Hallux limitus and specific tests
Functional hallux limitus corresponds to a blockage of the long flexor of the hallux in the retrotalar tunnel, preventing dorsiflexion of the big toe at the end of the stance phase. This defect disrupts the supination-pronation transition and desynchronizes the entire chain. The specific "stretch test", performed with the ankle in dorsiflexion with firm support under the metatarsal heads, highlights this blockage. Clinically, the pain map associates TFL/crow's feet and postero-internal facet of the patella, with possible bone edema on imaging.
Identifying this mechanism is crucial for guiding effective treatment and avoiding recurrences.
Priority conservative treatment and reprogramming
The first line combines targeted rehabilitation (strengthening of the hip abductors, neuromuscular control, work on the extensor system) and foot management (subtalar decoaptation maneuvers, hallux mobility work, orthoses if necessary). Gesture coaching (landing, hip-knee-foot alignment) and weight-bearing education help to alleviate patellofemoral constraints.
This global approach aims to restore walking rhythm and lasting dynamic stabilization, with a gradual resumption of sporting activities.
Endoscopic athenolysis can provide lasting relief to patients resistant to conservative treatment.
When to consider surgery: endoscopic athenolysis of FHL
In rebellious cases, endoscopic release of the retrotalar pulley of the flexor hallucis longus may be proposed after rigorous assessment and failure of successful conservative treatment. Clinical series report high satisfaction rates and improvement in podiatric parameters (reloading of the first metatarsal head, better stability in weight-bearing). The inclusion criteria and the provocation test ("stretch test") guide the indication.
The decision is shared and is part of a post-operative rehabilitation protocol focused on recovering the rolling of the step.
Message to the sports patient
Patellar syndrome is not inevitable. Careful gait analysis and targeted rehabilitation can most often correct the problem without surgery. Treatment focuses on function: alignment, movement control, weight distribution, and gradual reintegration of sports movements. If the problem persists, a minimally invasive solution can be discussed, in a safe environment and with realistic goals.
Listening to symptoms during exercise, progressive loads and some technical adjustments preserve the performance and health of the knee.
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