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Introduction: Hydroxyapatite deposition disease (HADD) is caused by the presence of hydroxyapatite crystals in periarticular spaces oftentimes leading to inflammation, pain, and decreased range of motion.Case Report: A 40-year-old right hand dominant female presented with three days of atraumatic right shoulder pain. Radiographs of the right shoulder were negative. Computed tomographyrevealed a hydroxyapatite deposit adjacent to the acromioclavicular joint. The patient was managed with nonsteroidal anti-inflammatory drugs and a referral to orthopedic surgery.Conclusion: Many instances of HADD will not be diagnosed on plain radiographs, and heightened awareness will provide confidence when ordering confirmatory imaging. Management is typically conservative, however, referral to orthopedic surgery is recommended to ensure improvement and to assess the need for more invasive procedures.

Context: Girls' high school volleyball is a popular sport with a high rate of overuse injuries and sport specialization. Health professionals perceive that high school athletes are reluctant to follow treatment plans involving sport activity reduction. This study's purpose was to describe high school girls' volleyball athletes' self-reported shoulder and knee pain, the likelihood of adhering to medical advice, and the association of factors that influence the likelihood of reporting overuse injuries and sport specialization. Study Design: Cross-sectional. Methods: Participants completed an online survey (demographics, sport participation measures, shoulder and knee pain information, medical adherence likelihood [4-point Likert: not at all likely to extremely likely], and factors influencing overuse injury reporting intentions). A 2 × 2 chi-square analysis compared factors that influence athletes' intentions to "not report an overuse injury" (eg, I thought my coach would get mad; yes/no) and sport specialization (nonhighly specialized/highly specialized athletes). Results: There were 150 participants (highly specialized = 56%, grade: ninth = 33%, 10th = 28%, 11th = 22%, 12th = 17%). At least 60% reported shoulder and knee pain related to an overuse mechanism. Most reportedly did not seek rehabilitation led by a medical provider (shoulder pain = 66%, knee pain = 60%). Only 11% of athletes reported they were "extremely likely" to rest from sporting activity during the regular season if advised by a medical professional. Highly specialized athletes were more likely to report the pursuit of a college scholarship as a factor that influences their intention to report an overuse injury compared to nonhighly specialized athletes (13% vs 3%, respectively, P =.04). Conclusions: Most girls' volleyball athletes did not treat their pain with guided rehabilitation, which may increase their risk of a worse overuse injury or even acute injury. Clinicians, athletes, parents, and coaches need to work together to create a sport culture that empowers athletes to discuss their pain and overuse injuries with medical professionals. [ABSTRACT FROM AUTHOR]