Hip arthroscopies are often used in the treatment of intra-articular hip injuries. Patient-reported outcomes (PRO) are an important parameter in evaluating treatment. It is unclear which PRO questionnaires are specifically available for hip arthroscopy patients. The aim of this systematic review was to investigate which PRO questionnaires are valid and reliable in the evaluation of patients undergoing hip arthroscopy.

To determine the intrarater reliability of the Humac NORM isokinetic dynamometer for concentric and eccentric strength tests of knee and shoulder muscles. 54 participants (50% female, average age 20.9 ± 3.1 years) performed concentric and eccentric strength measures of the knee extensors and flexors, and the shoulder internal and external rotators on two different Humac NORM isokinetic dynamometers, which were situated at two different centers. The knee extensors and flexors were tested concentrically at 60° and 180°/s, and eccentrically at 60° s. Concentric strength of the shoulder internal and external rotators, and eccentric strength of the external rotators were measured at 60° and 120°/s. We calculated intraclass correlation coefficients (ICCs), standard error of measurement, standard error of measurement expressed as a %, and the smallest detectable change to determine reliability and measurement error. ICCs for the knee tests ranged from 0.74 to 0.89, whereas ICC values for the shoulder tests ranged from 0.72 to 0.94. Measurement error was highest for the concentric test of the knee extensors and lowest for the concentric test of shoulder external rotators.

Nine male and seven female asymptomatic elite badminton players were tested bilaterally to determine concentric and eccentric strength values, conventional ratio and dynamic control ratio of shoulder rotator muscles. All tests were performed at 60 and 120°/sec. The study shows significant differences that were similar for men and women: the dominant arm was stronger than the non-dominant arm, normalised peak torque values at 60°/sec were higher than at 120°/sec, the concentric internal rotator strength(IRS) was larger than the concentric external rotator strength (ERS) and the eccentric ERS was larger than the concentric ERS. For females the eccentric ERS was larger than the concentric IRS as opposed to men in whom the concentric IRS was larger than the eccentric ERS. For both sexes the CVR for the dominant arm was significantly higher than for the non-dominant arm. The DCR at 60°/sec was significantly lower than at 120°/sec and the DCR for females was significantly higher than for men. Data presented are important for interpreting isokinetic shoulder rotator strength tests in elite badminton players and could be relevant in rehabilitation and prevention of shoulder injuries.