Surveys have suggested one of the most important determinants of orthopaedic resident selection is completion of an orthopaedic clerkship at the program director's institution. The purpose of this study was to further elucidate the significance of visiting externships on the resident selection process. We retrospectively reviewed data for all medical students applying for orthopaedic surgery residency from six medical schools between 2006 and 2008, for a total of 143 applicants. Univariate and multivariate regression analyses were used to compare students who matched successfully versus those who did not in terms of number of away rotations, United States Medical Licensing Examination scores, class rank, and other objective factors. Of the 143 medical students, 19 did not match in orthopaedics (13.3%), whereas the remaining 124 matched. On multiple logistic regression analysis, whether a student did more than one home rotation, how many away rotations a student performed, and United States Medical Licensing Examination Step 1 score were factors in the odds of match success. Orthopaedic surgery is one of the most competitive specialties in medicine; the away rotation remains an important factor in match success.
Compared with a closely matched control cohort, we found that 75% of surgical patients returned to play again in the NBA, compared with 88% in control subjects who did not undergo surgery. For those players who returned, overall athletic performance was slightly improved or no worse than control subjects.
Compared with disease estimates in the general population, spine surgeons have a higher prevalence of MSDs. Our cohort underwent surgical intervention for lumbar (7.1%) and cervical (4.6%) disc disease at rates far exceeding disease estimates in the general population. Increased awareness among spine surgeons may lead to earlier treatment and, ultimately, enhanced preventive measures.
The tensile modulus of articular cartilage is much larger than its compressive modulus. This tension-compression nonlinearity enhances interstitial fluid pressurization and decreases the frictional coefficient. The current set of studies examines the tensile and compressive properties of cylindrical chondrocyte-seeded agarose constructs over different developmental stages through a novel method that combines osmotic loading, video microscopy, and uniaxial unconfined compression testing. This method was previously used to examine tension-compression nonlinearity in native cartilage. Engineered cartilage, cultured under free-swelling (FS) or dynamically loaded (DL) conditions, was tested in unconfined compression in hypertonic and hypotonic salt solutions. The apparent equilibrium modulus decreased with increasing salt concentration, indicating that increasing the bath solution osmolarity shielded the fixed charges within the tissue, shifting the measured moduli along the tension-compression curve and revealing the intrinsic properties of the tissue. With this method, we were able to measure the tensile (401±83 kPa for FS and 678±473 kPa for DL) and compressive (161±33 kPa for FS and 348±203 kPa for DL) moduli of the same engineered cartilage specimens. These moduli are comparable to values obtained from traditional methods, validating this technique for measuring the tensile and compressive properties of hydrogel-based constructs. This study shows that engineered cartilage exhibits tension-compression nonlinearity reminiscent of the native tissue, and that dynamic deformational loading can yield significantly higher tensile properties.
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