A study presented at the Knee Society Specialty Day highlighted aseptic loosening as the cause of failure in half of unicompartmental knee arthroplasties and that they are more likely to fail due to pain than total knees. “Unicompartmentals are revised earlier than total knees,” Michael E. Berend, MD, of the Center for Hip & Knee Surgery in Mooresville, Ind., said during his presentation. “{Unicompartmentals are} much more likely to be revised for pain with unknown outcomes. Fixation remains an issue in the future.”
Orthopedicstoday, July 2013

Anterior knee pain is one of the most common complaints in an orthopaedist’s office.  Some patients have pain due to abnormalities of the patella tracking over the trochles, but a significant number of patients have normal X-Ray parameters indicating normal alignment and no clinical evidence of maltracking.  Many of these patients are significantly, if not severely, overweight and present with a body mass index of 40 and higher. These patients likely overload the patellofemoral joint. It is important to understand that, while all lower rxtremity joints suffer from high body mass, the patellofemoral joint sees the highest loads (seven to 10 times body weight) with every step.
Orthopedicsetoday, July 2013

Long term results after an isolated posterior cruciate ligament (PCL) injury show that patients remain active, have good strength and full range of motion, and report good subjective scores. The prevalence of moderate to severe osteoarthritis was 11%. Results were not different based on posterior cruciate ligament (PCL) laxity grade. This natural history study of nonoperatively treated posterior cruciate ligament (PCL) injuries can serve as a baseline for comparison with patients treated with posterior cruciate ligament (PCL) reconstruction.
The American Journal of Sports Medicine, July 2013

At 6-year follow-up, 18.9% of patients who had undergone anterior cruciate ligament reconstruction underwent subsequent surgeries on the ipsilateral knee. The rates between an ipsilateral anterior cruciate ligament reconstruction graft versus a contralateral normal anterior cruciate ligament tear were similar (7.7% vs 6.4%, respectively). Younger age and the use of allografts were risk factors for subsequent surgery.
The American Journal of Sports Medicine, July 2013

Sex-specific outcomes have been reported in anterior cruciate ligament reconstruction as well as in osteoarthrosis progression.  A recent study published in the July issue of the American Journal of Sports Medicine suggests that autologous chondrocyte implantation is a promising treatment option for full-thickness cartilage defects of male and female knee joints. Female patients with patellar defects have worse prognostic factors.