Correlation of MRI grading of bone stress injuries with clinical risk factors and return to play: a 5-year prospective study in collegiate track and field athletes.

BACKGROUND: Bone stress injuries are common in track and field athletes. Knowledge of risk factors and correlation of these to magnetic resonance imaging (MRI) grading could be helpful in determining recovery time. PURPOSE: To examine the relationships between MRI grading of bone stress injuries with clinical risk factors and time to return to sport in collegiate track and field athletes. STUDY DESIGN: Cohort study (prognosis); Level of evidence, 2. METHODS: A total of 211 male and female collegiate track and field and cross-country athletes were followed prospectively through their competitive seasons. All athletes had preparticipation history, physical examination, and anthropometric measurements obtained annually. An additional questionnaire was completed regarding nutritional behaviors, menstrual patterns, and prior injuries, as well as a 3-day diet record. Dual-energy X-ray absorptiometry was performed at baseline and each year of participation in the study. Athletes with clinical evidence of bone stress injuries had plain radiographs. If radiograph findings were negative, MRI was performed. Bone stress injuries were evaluated by 2 independent radiologists utilizing an MRI grading system. The MRI grading and risk factors were evaluated to identify predictors of time to return to sport. RESULTS: Thirty-four of the athletes (12 men, 22 women) sustained 61 bone stress injuries during the 5-year study period. The mean prospective assessment for participants was 2.7 years. In the multiple regression model, MRI grade and total-body bone mineral density (BMD) emerged as significant and independent predictors of time to return to sport. Specifically, the higher the MRI grade (P = .004) and lower the BMD (P = .030), the longer the recovery time. Location of the bone injury at predominantly trabecular sites of the femoral neck, pubic bone, and sacrum was also associated with a prolonged time to return to sport. Female athletes with oligomenorrhea and amenorrhea had bone stress injuries of higher MRI grades compared with eumenorrheic athletes (P = .009). CONCLUSION: Higher MRI grade, lower BMD, and skeletal sites of predominant trabecular bone structures were associated with a delayed recovery of bone stress injuries in track and field athletes. Knowledge of these risk factors, as well as nutritional and menstrual factors, can be clinically useful in determining injury severity and time to return to sport.

Restoration of menses with nonpharmacologic therapy in college athletes with menstrual disturbances: a 5-year retrospective study.

BACKGROUND: Functional hypothalamic amenorrhea is common among female athletes and may be difficult to treat. Restoration of menses (ROM) is crucial to prevent deleterious effects to skeletal and reproductive health. OBJECTIVES: To determine the natural history of menstrual disturbances in female college athletes managed with nonpharmacologic therapies including increased dietary intake and/or decreased exercise expenditure and to identify factors associated with ROM. STUDY DESIGN: A 5-yr retrospective study of college athletes at a major Division I university. METHODS: 373 female athletes' charts were reviewed. For athletes with menstrual disturbances, morphometric variables were noted. Months to ROM were recorded for each athlete. RESULTS: Fifty-one female athletes (19.7%) had menstrual disturbances (14.7% oligomenorrheic, 5.0% amenorrheic). In all, 17.6% of oligo-/amenorrheic athletes experienced ROM with nonpharmacologic therapy. Mean time to ROM among all athletes with menstrual disturbances was 15.6 ± 2.6 mo. Total absolute (5.3 ± 1.1 kg vs. 1.3 ± 1.1 kg, p < .05) and percentage (9.3% ± 1.9% vs. 2.3% ± 1.9%, p < .05) weight gain and increase in body-mass index (BMI; 1.9 ± 0.4 kg/m2 vs. 0.5 ± 0.4 kg/m2, p < .05) emerged as the primary differentiating characteristics between athletes with ROM and those without ROM. Percent weight gain was identified as a significant positive predictor of ROM, OR (95% CI) = 1.25 (1.01, 1.56), p < .05. CONCLUSIONS: Nonpharmacologic intervention in college athletes with menstrual disturbances can restore regular menstrual cycles, although ROM may take more than 1 yr. Weight gain or an increase in BMI may be important predictors of ROM.