An observational study in Patellar Luxation and Patellar Instability, sponsored by Hannover Medical School. Completed at 1 site in Germany. Open to participants aged 18 Years and older. Per ClinicalTrials.gov, last updated 2021-03-19.
Sponsored by Hannover Medical School · Observational
In a single surgical center, 213 consecutive patients with 221 knees were surgically treated for recurrent lateral patellar dislocation between 07/2010 and 12/2016. All patients obtained dynamic reconstruction of the MPFL with detachment of the gracilis tendon at the pes anserinus while maintaining the proximal origin at the gracilis muscle. Patellar fixation was performed by oblique transpatellar tunnel transfer and tenodesis screw. Follow-up data including Kujala-, BANFF- and Norwich patellar instability score as well as Return-to-Sport and pain level were collected at a minimum follow-up of 2 years
Patients were identified through the hospitals database using OPS-Codes for MPFL reconstruction. The included surgeries were performed from 07/2010 to 12/2016 in a single orthopedic hospital.
Inclusion criteria:
Exclusion criteria:
Concomitant alignment correction surgery including femoral/tibial osteotomy, trochleoplasty and tibial tubercle transfer
213 Patients with 221 knees (8 bilateral) met the inclusion criteria. All patients were contacted by mail or phone to independently answer questionnaires.
Surgical technique:
The technique was performed according to the description by Ostermeier et al.. Briefly, the gracilis tendon is detached at its insertion site at the pes anserinus after opening the sartorius fascia. Instead of transferring the tendon through a subligamentous tunnel of the medial collateral ligament, as detailed in the original description of the technique, the tendon was passed around the incised sartorius fascia. From around the sartorius fascia the gracilis tendon is shuttled subcutaneously to the medial patellar margin, allowing the sartorius fascia to act as a pulley for the transferred tendon. Due to the dynamic reconstruction technique, the course of the graft appears to be more oblique compared to the static technique with femoral fixation at Schöttle's point. Fixation of the tendon is achieved by passing it through a transpatellar drill hole extending from the proximal medial patellar margin to the lateral patellar margin. The tendon is then tensioned with the knee in 30 degrees of flexion and fixed with a bioabsorbable tenodesis screw.
Data collection was performed by self-administered questionnaires, which were sent to the patients.
The medical records and radiographs of all patients were reviewed for demographic information (age, sex) and to identify complications related to the surgical procedure. Complications were categorized as major if the patient returned to the operating room or required hospitalization after the index procedure. Complications were categorized as minor complications if they were treated on an outpatient basis.
Rating of the results was performed using the Kujala score, the Norwich Patellar Instability Score and the BANFF Score.
Pain level was recorded using the visual analogue scale (VAS, 0 = no pain, 10 = severe pain). General satisfaction with treatment outcomes was evaluated by questionnaire (1 = excellent, 2 = very good, 3 = good, 4 = fair, 5 = poor, 6 = very poor) and by asking patients whether they would undergo the procedure again. Furthermore, information on patient characteristics, recurrence of dislocation, revision surgery, and other postoperative complications were recorded.
Postoperative x-rays were analyzed concerning intraoperative complications (e.g. fractures or patellar drill hole malpositioning).
41 studies on the registry are indexed under Patellar Dislocation; 9 are open to participants now.
This study's enrollment of 152 is above the median of 100 across 15 observational studies indexed under Patellar Dislocation.
Browse Patellar Dislocation studies →Hannover Medical School is the lead sponsor of 202 studies on the registry; 25 are open to participants now.
Counted across the registry records on this site, refreshed daily.
Patients were identified through the hospitals database using OPS-Codes for MPFL reconstruction.
Go through the criteria one by one — yes, no or not sure — and take the list to your doctor or the study team. Kept in this browser only.
Exclusion Criteria:
Kujala score
The Kujala Anterior Knee Pain Scale is a patient reported assessment of patellofemoral disorders that assesses subjective symptoms and functional limitations. The score consists of 13 questions that add up to a total of 100 points. Minimum: 0 (worst), Maximum: 100 (best)
Time frame: 24 months postoperative
Norwich Patellar Instability Score (NPI Score)
The Norwich Patellar Instability Score is a patient reported assessment of patellofemoral instability. The score consists of 19 questions with a special weighting for every question. The results are presented in percent. Range: 0% (best) to 100% (worst)
Time frame: 24 months postoperative
BANFF Score
The Banff Score is a patient reported assessment of patellofemoral disorders that assesses patella instability. The score consists of 23 questions. Minimum: 0 (worst), Maximum: 100 (best)
Time frame: 24 months postoperative
This study is completed, as verified in Mar 2021. You cannot join it, but the record below documents what was studied.
Get an email when the registry record changes — status, dates, results — or when someone posts here.
Sign in to followQuestions and observations about this study, from anyone following it. Not medical advice, and not a channel to the study team — their contact details are on the registry record.
Sign in to join the discussion. Reading takes no account; posting does. You choose a display name, and a pseudonym is the default.
Nothing here yet. If you are running this trial, taking part in it, or weighing whether to, this is the place to say so.