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

The objective of this study is to analyze subjects having a normal hip and compare the in vivo kinematics to subjects requiring a total hip arthroplasty (THA) due to having a diseased hip and then later post-operative to their implanted hip. Ten subjects will have a normal hip, ten hips will be diseased, requiring a THA and then those ten diseased hips will be re-analyzed at least six months post-operatively after implantation of a THA.


Eligibility Criteria:
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.