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Clinical and Functional Outcome After Lateral Trochlear Lengthening Osteotomy Lateral Trochlear Lengthening Osteotomy

NCT ID: NCT04378491

Last Updated: 2020-11-10

Study Results

Results pending

The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.

Basic Information

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Recruitment Status

COMPLETED

Total Enrollment

6 participants

Study Classification

OBSERVATIONAL

Study Start Date

2020-04-01

Study Completion Date

2020-09-30

Brief Summary

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The purpose of this study is to evaluate the functional and clinical outcome of this new lengthening osteotomy of the lateral trochlea in patients with patella instability, trochlear dysplasia Dejour type A or B, short lateral articular trochlea quantified by the lateral condyle index and presence of a lateral trochlear bump.

Detailed Description

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A short lateral articular trochlea leads to failure in stabilizing the patella close to full Extension of the knee. To address this type of pathology, a trochlear lengthening osteotomy was described. To date only case reports describing the clinical outcome of this new osteotomy exist and information on functional outcome regarding muscle strength and electromyography (EMG) data is lacking. The purpose of this study is to evaluate the functional and clinical outcome of this new lengthening osteotomy of the lateral trochlea in patients with patella instability, trochlear dysplasia Dejour type A or B, short lateral articular trochlea quantified by the lateral condyle index and presence of a lateral trochlear bump.

Conditions

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Patellar Instability

Keywords

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lengthening osteotomy of the lateral trochlea Lateral trochlear lengthening osteotomy trochlear dysplasia Dejour type A or B short lateral articular trochlea

Study Design

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Observational Model Type

COHORT

Study Time Perspective

PROSPECTIVE

Interventions

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Collection of clinical measurements

Collection of clinical measurements:

* Active and passive range of motion (ROM) of the knee, hip and ankle Joint bilaterally.
* Passive patellar translation in 30° of flexion billaterally in quadrants of translation.
* Patellar apprehension test (Fairbank's Test) and the Moving Patellar Apprehension (MPAT) test for the diagnosis of patellar instability. The Fairbank's Test is performed in 30° of Flexion while the MPAT is performed while flexing the knee from 0° to 90°.

Intervention Type OTHER

Collection of data for muscle strength

Collection of data for muscle strength:

* Muscle strength will be measured bilaterally using a dynamometer (Biodex System 4 Pro: Biodex Medical Systems, Shirley, NY, USA). For the knee, maximum isokinetic Flexion and extension torques will be collected between full extension and full flexion at a movement speed of 60°/s (3 x 5 repetitions) Maximum joint torques in each movement direction will be recorded for each joint and normalized to body weight

Intervention Type OTHER

Collection of EMG Data

Collection of EMG Data:

* Surface electrodes will be placed bilaterally on the vastus medialis and lateralis rectus femoris, biceps femoris and semitendinosus muscles following the guidelines of the SENIAM project (Surface ElectroMyoGraphy for the Non-Invasive Assessment of Muscles). Simultaneously with the muscle strength measurements, EMG data will be collected using a 12-channel EMG system (myon AG, Schwarzenberg, Switzerland, sampling rate 2400 Hz).

Intervention Type OTHER

Collection of Clinical Scores

Collection of Clinical Scores:

* patient's pain, range of motion and ability to perform daily living activities will be assessed using the Kujala Anterior Knee Pain Scale, Lysholm Knee Score, visual analog scale score (VAS) and the Tegner Activity Score

Intervention Type OTHER

Collection of Imaging Data - Radiological measurements

Collection of Imaging Data - Radiological measurements: Xrays and MRIs which were already performed as part of the original diagnostic and follow-up procedures pre- and postoperative will be reviewed and analysed.

Intervention Type OTHER

Eligibility Criteria

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Inclusion Criteria

* 2 years (as of September 2019) since conducting a lateral trochlear lengthening osteotomy

Exclusion Criteria

* Inability to provide informed consent
* Neurological disorders potentially affecting lower extremity muscle strength.
* Surgery involving the patellofemoral joint prior to the lateral trochlear lengthening osteotomy
Minimum Eligible Age

18 Years

Eligible Sex

ALL

Accepts Healthy Volunteers

No

Sponsors

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University Hospital, Basel, Switzerland

OTHER

Sponsor Role lead

Responsible Party

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Responsibility Role SPONSOR

Principal Investigators

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+41 (0)61 32 87133 Muendermann, Prof.

Role: PRINCIPAL_INVESTIGATOR

Orthopädie/Traumatologie, University Hospital Basel

Locations

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Orthopädie/Traumatologie, University Hospital Basel

Basel, , Switzerland

Site Status

Countries

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Switzerland

References

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Ismailidis P, Egloff C, Nuesch C, Mundermann A, Pagenstert G. Lateral trochlear lengthening osteotomy. Arch Orthop Trauma Surg. 2021 Oct;141(10):1721-1730. doi: 10.1007/s00402-020-03736-5. Epub 2021 Feb 24.

Reference Type DERIVED
PMID: 33625541 (View on PubMed)

Other Identifiers

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2019-01405; ch20Muendermann2

Identifier Type: -

Identifier Source: org_study_id