Imaging Review of Groin Pain in Elite Athletes: An Anatomic Approach to Imaging Findings. Koulouris G. AJR 2008;191:962-972. A very nice review of the many things causing groin pain in an athlete, and how to image them.
Shoulder
Rotator-Cuff Failure. Matsen FA 3rd. N Engl J Med 2008;358:2138-2147.A recent review of a common clinical problem from one of the leading experts in orthopaedics.
Levine BD, Motamedi K, Seeger LL. Imaging of the shoulder: a comparison of MRI and ultrasound. Current sports medicine reports. 2012 Sep;11(5):239–43. PubMed)
Modarresi S, Motamedi D, Jude CM. Superior labral anteroposterior lesions of the shoulder: part 1, anatomy and anatomic variants. AJR Am J Roentgenol. 2011 Sep;197(3):596–603. PubMed)
Modarresi S, Motamedi D, Jude CM. Superior labral anteroposterior lesions of the shoulder: part 2, mechanisms and classification. AJR Am J Roentgenol. 2011 Sep;197(3):604–11. PubMed)
Knee
How I diagnose meniscal tears on knee MRI. De Smet AA. AJR 2012;199:481-499. An excellent review of the diagnosis of meniscal tears by one of the true Jedi of MSK radiology.
Huang G-S, Lee C-H, Chan WP, Lee H-S, Chen C-Y, Yu JS. Acute anterior cruciate ligament stump entrapment in anterior cruciate ligament tears: MR imaging appearance. Radiology. 2002 Nov;225(2):537–40.
Nguyen JC, de Smet AA, Graf BK, Rosas HG. MR Imaging-based Diagnosis and Classification of Meniscal Tears. Radiographics. 2014 Jul;34(4):981–99. PubMed
Saddik D, McNally EG, Richardson M. MRI of Hoffa's fat pad. Skeletal Radiol. 2004 Aug;33(8):433–44. PubMed