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Objective: To verify whether the tibial tuberosity-trochlear groove distance (TT-TG) and the tendinous-cartilaginous TT-TG (the distance between the patellar tendon and trochlear groove: PT-TG) are identical using computed tomography (CT) and magnetic resonance imaging (MRI) techniques., Subjects and Methods: The TT-TG and PT-TG distances were measured on the same knee samples by three observers (two measurements per observer) using CT and MRI scans collected retrospectively. The reproducibility of the measurements was assessed using the interclass correlation coefficient (ICC). The means and standard deviations of four measurements were calculated for each patient. A paired t-test was used to assess differences between measurements., Results: Fifty knee samples (32 with patellar instability and 18 with other conditions) were evaluated. The inter- and intraobserver reliability was excellent for all four measurements (>0.8). On average, the TT-TG distance on MRI was 3.1-3.6 mm smaller than that on CT, and the PT-TG distance on MRI was 1.0-3.4 mm larger than the TT-TG distance on MRI., Conclusion: The osseous TT-TG and tendinous-cartilaginous PT-TG distances determined by CT and MRI were not identical.

Background: Isolated reconstruction of the anterior cruciate ligament (ACL) does not reestablish the normal knee biomechanics in cases of associated injuries to the anterolateral structures. Studies evaluating the potential clinical effect of anterolateral ligament (ALL) injury on the treatment of ACL injuries are necessary to validate the findings of biomechanical studies. Purpose: To evaluate the clinical outcomes and failure rate of ACL reconstruction in patients with and without ALL injury diagnosed using magnetic resonance imaging. Study Design: Cohort study; Level of evidence, 2. Methods: A prospective cohort of patients with acute ACL injury was divided into 2 groups based on the presence (ALL group) or absence (no-ALL group) of ALL injury on preoperative magnetic resonance imaging scans. Both groups underwent anatomic reconstruction of the ACL with autologous hamstring tendon grafts. The Lysholm and subjective IKDC scores (International Knee Documentation Committee), KT-1000 arthrometer and pivot-shift test results, reconstruction failure rate, incidence of contralateral ACL injury, presence of associated meniscal injury, and presence of knee hyperextension were evaluated. Results: A total of 182 patients were evaluated. Postoperative mean ± SD follow-up was 33.6 ± 7.1 and 36.1 ± 8.1 months for the ALL and no-ALL groups, respectively. No significant differences were found between the groups in terms of age, sex, knee hyperextension, duration of injury before reconstruction, follow-up time, or associated meniscal injuries. In the preoperative evaluation, the pivot-shift grade was similar, and the ALL group had worse KT-1000 arthrometer values (7.9 ± 1.2 mm vs 7.2 ± 1.1 mm; P <.001). In the postoperative evaluation, patients in the no-ALL group had a lower reconstruction failure rate (10.2% vs 1.4%; P =.029) and better clinical outcomes according to the IKDC subjective (85.5 ± 10.7 vs 89.1 ± 6.6; P =.035) and Lysholm scores (85.9 ± 10.1 vs 92.0 ± 6.3; P <.001). There was no postoperative difference in the KT-1000 or pivot-shift results. Conclusion: Combined ACL and ALL injuries were associated with significantly less favorable outcomes than were isolated ACL injuries at a minimum follow-up of 2 years after ACL reconstruction. Patients with concomitant ALL injury showed a higher rerupture rate and worse functional scores. [ABSTRACT FROM AUTHOR]

Purpose: The purpose of this study was to describe the clinical outcomes of partial meniscectomy in patients with "fatigue meniscal tear", which presents as a non-traumatic tear with abrupt onset of symptoms of a radial tear in the transition between the middle and posterior thirds of the meniscus.Methods: We prospectively followed 71 patients with "fatigue meniscal tear" (41 women and 30 men, mean age of 63 years, SD 6.9 years) recruited among 497 patients with isolated medial meniscal lesions treated between January 2006 and June 2011. Inclusion criteria were spontaneous abrupt onset knee pain, minor or no trauma, no radiographic or MRI osteoarthritis, no bone oedema, pre-operative magnetic resonance image of medial meniscus tear, and arthroscopic evaluation demonstrating radial or vertical flap tear in the body to posterior horn junction of the medial meniscus. We followed all patients for a minimum of two years and reviewed their clinical symptoms, physical exam, functional outcome, and patient satisfaction at last follow-up.Results: The average follow-up was 4.2 years, with a minimum follow-up of two years. Among the 71 patients, there were 59 (83.1 %) good or excellent results and 12 (16.9 %) poor results. These 12 patients demanded further treatment because of persistent pain, with three of the patients developing subchondral bone fracture. All patient complaints and poor outcomes could be identified in the initial six months after surgery. There was no gender difference in the subgroup analysis.Conclusion: Our findings indicate that patients with "fatigue meniscal tear" benefit from arthroscopic partial meniscectomy, with only 16.9 % reporting unfavourable results.Level Of Evidence: IV, Cohort study or case series. [ABSTRACT FROM AUTHOR]