ArticleBMC musculoskeletal disorders2021
Assessment of knee flexor muscles strength in patients with patellar instability and its clinical implications for the non-surgical treatment of patients after first patellar dislocation - pilot study.
Article in BMC musculoskeletal disorders, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. It is linked to trial NCT04838158 (Assessment of Knee Flexor Muscles Strength in Patients With Patellar Instability and Its Clinical Implication in Non-surgical Treatment of Patients After First Patella Dislocation.), which is not on this map. Cited by 5 papers.
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The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Assessment of Knee Flexor Muscles Strength in Patients With Patellar Instability and Its Clinical Implication in Non-surgical Treatment of Patients After First Patella Dislocation.
Who cites it
5 citing papers in PubMed.
- Good clinical but inferior functional outcomes following surgical patellar stabilisation: A prospective study.Journal of experimental orthopaedics · 2026Article
- Comparison of double bundle semitendinosus technique and pedicled quadriceps technique in patellar instability.Knee surgery, sports traumatology, arthroscopy : official journal of the ESSKA · 2025Article
- Radiological Verification for the Suitability of Using the Quadriceps Angle to Represent Orientation of the Quadriceps Femoris.Orthopaedic surgery · 2024Article
- Ebbing Strength, Fading Power: Unveiling the Impact of Persistent Fatigue on Muscle Performance in COVID-19 Survivors.Sensors (Basel, Switzerland) · 2024Article
- Association between single leg hop tests and patient reported outcome measures and patellar instability in patients with recurrent patellar dislocations.BMJ open sport & exercise medicine · 2023Article
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5 authors.
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Abstract
backgroundBiomechanical studies indicate that during outward rotation of the tibia and the valgus knee joint position, the patella is shifted in the lateral direction. After first-time patellar dislocation, the dynamic position of the femur in relation to the tibia plays an important role in joint stability, because the medial stabilizer of the patella (mostly the MPFL) is damaged or inefficient. The most important factor in controlling the rotational movement of the tibia in relation to the thigh are the hamstring muscles. The aim of the study therefore is to determine whether patients with patellar instability have a significant weakness in the knee flexor muscles, which can predispose to recurrent dislocations. This is an important consideration when planning the rehabilitation of patients with first-time patellar dislocation.
methodsThe study enrolled 33 patients with confirmed recurrent patellar dislocation, including six patients with bilateral involvement. In the study group, the hamstring muscles (both sides) were evaluated at velocities of 60 and 180 deg/s for the following parameters: peak torque, torque at 30 degrees of knee flexion, angle of peak torque and peak torque hamstring to quadriceps ratio (H/Q ratio).
resultsIn the recurrent patellar dislocation group, a statistically significant weakness in knee flexors was observed for both angular velocities compared to age and gender normative data. No such relationship was observed in the control group of heathy subjects. In patients with one-sided dislocation, no differences were found in knee flexors peak torque, torque at 30 degrees of knee flexion, angle of peak torque or H/Q ratio between the healthy and affected limbs for either angular velocity.
conclusionsIn patients with recurrent patellar dislocation, knee flexors strength is decreased significantly in both the unaffected and affected limbs. This may indicate a constitutional weakening of these muscles which can predispose to recurrent dislocations.
trial registrationThe study was retrospectively registered on ClinicalTrials.gov ( NCT04838158 ), date of registration; 22/03/2021.
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