Medial patellotibial ligament (MPTL) reconstruction for patellar instability.

PURPOSE: To evaluate mid-term clinical and radiographic outcomes after an original medial patellotibial ligament reconstruction in patients with patellar dislocation. METHODS: Twenty-nine knees (27 patients, 8 males and 19 females) treated for patellar dislocation with medialization of the patellar tendon medial third combined with medial and lateral release were evaluated clinically and radiographically at a mean follow-up of 6.1±2.5 years. Trochleoplasty was performed in case of severe flat trochlea (6 knees, 21%). Aetiology of patellofemoral instability was traumatic in 6 (21%) and atraumatic in 23 (79%) knees. The mean age at first dislocation was 19.2±10.1 years. WOMAC, subjective and objective IKDC, Kujala, VAS for pain, Tegner activity and EQ-5D scores were used. Anteroposterior, lateral and 30° axial views were performed for radiographic monitoring. RESULTS: There was a significant improvement of all clinical scores and significant reduction in knee pain. Twenty-four knees (83%) were normal or nearly normal by objective IKDC score at final follow-up. Radiographs showed a higher incidence of patella alta and flat trochlea in the atraumatic group. Severe signs of patellar osteoarthritis were found in 1 knee (3%). A higher body mass index (BMI) was correlated with worse pre-operative scores. Four knees (14%) were considered failures (2 further dislocations, 2 revision surgeries). The overall survival rate at 6 years was 0.811. CONCLUSIONS: The presented techniques produced good clinical and radiographic results at mean 6.1 years follow-up, with 14 % failures. Signs of patellofemoral dysplasia were found in patients with atraumatic patellar dislocation. BMI was related to worse pre-operative clinical status. LEVEL OF EVIDENCE: Retrospective study, Level IV.

Prospective trial of a treatment algorithm for the management of the anterior cruciate ligament-injured knee.

BACKGROUND: Specific guidelines for operative versus nonoperative management of anterior cruciate ligament injuries do not yet exist. HYPOTHESIS: Surgical risk factors can be used to indicate whether reconstruction or conservative management is best for an individual patient. STUDY DESIGN: Prospective nonrandomized controlled clinical trial; Level of evidence, 2. METHODS: Patients were classified as high, moderate, or low risk using preinjury sports participation and knee laxity measurements. Early anterior cruciate ligament reconstruction (within 3 months of injury) was recommended to high-risk patients and conservative care to low-risk patients. It was recommended that moderate-risk patients have either early reconstruction or conservative care, according to the day of presentation. Assessment of subjective outcomes, activity, physical measurements, and radiographs was performed at mean follow-up of 6.6 years. RESULTS: Early phase conservative management resulted in more late phase meniscus surgery than did early phase reconstruction at all risk levels (high risk, 25% vs 6.5%; moderate risk, 37% vs 7.7%, P = .01; low risk, 16% vs 0%). Early- and late-reconstruction patients' Tegner scores increased from presurgery to follow-up (P < .001) but did not return to preinjury levels. Early-reconstruction patients had higher rates of degenerative change on radiographs than did nonreconstruction patients (P < .05). CONCLUSIONS: Early phase reconstruction reduced late phase knee laxity, risk of symptomatic instability, and the risk of late meniscus tear and surgery. Moderate- and high-risk patients had similar rates of late phase injury and surgery. Reconstruction did not prevent the appearance of late degenerative changes on radiographs. Relationship between bone contusion on initial magnetic resonance images and the finding of degenerative changes on follow-up radiographs were not detected. The treatment algorithm used in this study was effective in predicting risk of late phase knee surgery.

Variation in anterior cruciate ligament scar pattern: does the scar pattern affect anterior laxity in anterior cruciate ligament-deficient knees?

PURPOSE: This prospective study documented patterns of scar formation after anterior cruciate ligament (ACL) rupture in order to test the hypothesis that ACL remnants can contribute to anterior knee passive motion limits tested with a ligament arthrometer. TYPE OF STUDY: Prospective cohort study. METHODS: Forty-eight consecutive patients undergoing ACL reconstructions had intra-operative ligament arthrometry testing before and immediately after preparation of the notch and debridement of the ACL remnant. Patterns of scar formation were compared with changes in knee laxity after debridement of the ACL remnant. RESULTS: Eighteen patients (38%) had ligament scarring to the posterior cruciate ligament (group 1). Four patients (8%) had scar tissue that appeared to extend from the ACL fibers to the roof of the notch (group 2). Six ACL remnants (12%) appeared to have healed to the lateral wall of the notch or the medial aspect of the lateral femoral condyle in a position anterior and distal to the ACL anatomic footprint (group 3). In 20 patients (42%), there was no identifiable ligament tissue remaining (group 4). Changes in anterior laxity were associated with the specific pattern of scar formation within the notch. The greatest increase in anterior laxity after debridement was observed in knees in which the injured ACL had an aberrant reattachment to the femur: group 1 (mean, -1.3 mm; P < .01), group 2 (mean, -3.4 mm; P < .05), and group 3 (mean, -4.3 mm; P < .05). In group 4, the change in knee laxity was not significant (mean, 0.2 mm; 95% CI, -0.29 to 0.74 mm). Overall, 14 of 48 knees (29%) loosened more than 2 mm after ACL resection ( P < .01). CONCLUSIONS: Resection of the ACL scar resulted in a measurable increase in passive anterior laxity in a subset of ACL-deficient knees. This increase in anterior laxity occurred in patients whose ligament healed to the femur, effectively crossing the joint. When performing arthroscopy without reconstruction in ACL-injured knees, we recommend caution in resecting the torn ACL or scar tissue because removal of this tissue contributed to increased anterior laxity in some ACL-deficient knees. LEVEL OF EVIDENCE: Level II, diagnostic study of consecutive patients.