THA Kinematics and Sound for Subjects for Normal, Diseased and Implanted Hips

Inclusion Criteria for diseased/implanted subjects: * Subjects will require a THA and will be implanted with either Summit/Pinnacle THA or Corail/Pinnacle THA. * Patients must be at least six months post-operative with no other surgical procedures conducted within the past six months that will prohibit them from performing the study activities. * Patients must be between 40-85 years of age. * Potential subjects will have a body weight of less than 250 lbs. * Participants must have Body Mass Index (BMI) of less than 38. * Potential subjects' THAs should be judged clinically successful with a HHS \>90. * Subjects must have demonstrated no evidence of post-operative hip subluxation or dislocation. * Subjects must not walk with a detectable limp and must be able to actively abduct their operated hip against gravity without difficulty. * Participants must be able to walk on level ground, ascend and descend a ramp and rise from a chair without assistance. * Patients from the physician's list who do not meet the study requirements will not be considered. * Patients must be willing to sign the Informed Consent (IC)/HIPAA form to participate in the study. Exclusion Criteria for diseased/implanted subjects: * Pregnant, potentially pregnant or lactating females. To satisfy radiation protocol, each female subject will be asked if she is pregnant, or possibly could be pregnant. A pregnant person will not be allowed to participate in the study. * Subjects without one of the two types of required hip implants. * Subjects who have had surgery within the past 6 months that would prohibit them from performing level walking, ascend and descend a ramp and rise from a chair without aid or support of any kind. * Subjects who are unable to perform level walking, ascend and descend a ramp and rise from a chair without aid or support. * Subjects with pain, functional deficits, or generalized inflammatory. * Subjects who walk with a detectable limp. * Subjects who cannot actively abduct their operated hip against gravity without difficulty. * Subjects who are unwilling to sign IC/HIPAA document. * Subjects who have a HHS \<90. Inclusion Criteria for normal subjects: * Patients must not have any kind of hip implant. * Subjects must not have had any type of hip surgery or any pathological hip conditions, including osteoarthritis, or hip pain. * Patients must be between the ages of 18 and 65. * Potential subjects will have a body weight of less than 250 lbs. * Participants must have BMI of less than 38. * Pregnant or potentially pregnant females will be excluded from the study. To satisfy radiation protocol, each female subject will be asked if she is pregnant, or possibly could be pregnant. A pregnant person will not be allowed to participate in the study. * Participants must be able to walk on level ground, ascend and descend a ramp and rise from a chair without aid of any kind or have had any kind of surgical procedure within the past 6 months that would affect his/her ability to perform the study activities. * Patients must be willing to sign the IC and HIPAA forms to participate in the study. * Patients must be between 160cm (5'3) and 193cm (6'4) tall Exclusion Criteria for normal subjects: * Pregnant, potentially pregnant or lactating females. To satisfy radiation protocol, each female subject will be asked if she is pregnant, or possibly could be pregnant. A pregnant person will not be allowed to participate in the study * Subjects with any kind of hip implant. * Subjects who have had any past hip surgery, have pathological hip conditions and/or hip pain. * Subjects who have had surgery within the past 6 months that would prohibit them from performing level walking, ascend and descend a ramp and rise from a chair without aid or support of any kind. * Subjects who are unable to perform level walking, ascend and descend a ramp and rise from a chair without aid or support. * Subjects who are unwilling to sign IC/HIPAA document.