Clinical trial NCT04378491: Clinical and Functional Outcome After Lateral Trochlear Lengthening Osteotomy Lateral Trochlear Lengthening Osteotomy
Official title: Tro_Le_Tomy - Clinical and Functional Outcome After Lateral Trochlear Lengthening Osteotomy
Study type: OBSERVATIONAL
Overall status: COMPLETED
Conditions: Patellar Instability
Keywords: lengthening osteotomy of the lateral trochlea
Lateral trochlear lengthening osteotomy
trochlear dysplasia Dejour type A or B
short lateral articular trochlea
Lead sponsor: University Hospital, Basel, Switzerland
Sponsor class: OTHER
First posted: 2020-05-07
Enrollment: 6
Sex: ALL
Minimum age (years): 18
Standard ages: ADULT
OLDER_ADULT
Accepts healthy volunteers: no
Observational model: COHORT
Time perspective: PROSPECTIVE
Sampling method: NON_PROBABILITY_SAMPLE
Study population: All patients treated between 01/2014 and 09/2017 (n=6) with lateral trochlear lengthening osteotomy at the Clinic of Orthopaedics and Traumatology at the University Hospital Basel

Brief 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.

Eligibility criteria: 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

Primary outcomes:
measure: presence of a recurrent patellar dislocation/ radiological reduction of the trochlear bump postoperative by plain radiograph of the knee/ lateral view
timeFrame: at Baseline
measure: presence of a recurrent patellar dislocation/ radiological reduction of the trochlear bump postoperative by Skyline patellar view
timeFrame: at Baseline
measure: (Change in) Lateral condyle index assessed by MRI of the knee
timeFrame: at Baseline
Secondary outcomes:
measure: Subjective Evaluation of the outcome of the operation
timeFrame: at Baseline
measure: Kujala Anterior Knee Pain Scale (AKPS)
timeFrame: at Baseline
measure: Lysholm Knee Score
timeFrame: at Baseline
measure: Visual analog scale score (VAS)
timeFrame: at Baseline
measure: Tegner activity scale
timeFrame: at Baseline
Other outcomes:
Locations:
city: Basel
country: Switzerland
facility: Orthopädie/Traumatologie, University Hospital Basel
Study officials:
affiliation: Orthopädie/Traumatologie, University Hospital Basel
name: +41 (0)61 32 87133 Muendermann, Prof.
role: PRINCIPAL_INVESTIGATOR
References:
citation: 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.