NCT04378491

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

Tro_Le_Tomy - Clinical and Functional Outcome After Lateral Trochlear Lengthening Osteotomy

• Status: Completed
• Phase: —
• Study type: Observational
• Enrollment: 6 (actual)
• Sponsor: University Hospital, Basel, Switzerland · Academic / Other
• Sex: All
• Age: 18 Years
• Healthy volunteers: Not accepted

Summary

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

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

• Patellar Instability

Interventions

Type	Name	Description
OTHER	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°.
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
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).
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
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.

Timeline

• Start date: 2020-04-01
• Primary completion: 2020-09-30
• Completion: 2020-09-30
• First posted: 2020-05-07
• Last updated: 2020-11-10

Locations

1 site across 1 country: Switzerland