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Accuracy of the Transpatellar Tendon Approach to Knee Arthrocentesis

This study has been completed.
Information provided by (Responsible Party):
Denver Health and Hospital Authority Identifier:
First received: April 23, 2009
Last updated: July 11, 2012
Last verified: July 2012

The purpose of this study is:

  • To determine the accuracy of intraarticular placement with the transpatellar tendon approach as compared to the suprapatellar approach. Patients undergoing knee arthroscopy will be consented for study of the injection of the fluid into the joint prior to portal placement or commencement of knee replacement. Patients will be randomized to receive injections via the transpatellar tendon or superolateral approach. Using injectable contrast and fluoroscopy, the placement of injections into the knee will be evaluated for accuracy. Injection attempts with contrast fluid that uniformly coats the articular surface on sagittal and coronal radiographs will be counted as successful. A concentration of contrast fluid in extraarticular fat will be counted as a failure.

Hypothesis: The rate of accuracy of intraarticular placement of the needle tip via the transpatellar tendon approach to knee aspiration is greater than that of the superolateral approach.

  • To determine the distribution of contrast material with the transpatellar tendon and superolateral apporaches. Using a previously described evaluation technique of dividing the knee into seven compartments, sagittal and coronal fluoroscopy images will be evaluated to determine the distribution of contrast fluid.

Hypothesis: Contrast injected into the knee via the trasnpatellar tendon approach will penetrate as many compartments of the knee as contrast injected via the superolateral approach.

Condition Intervention
Knee Aspiration Procedure: Transpatellar Approach Procedure: Suprapatellar

Study Type: Interventional
Study Design: Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Single (Participant)
Primary Purpose: Treatment

Further study details as provided by Denver Health and Hospital Authority:

Primary Outcome Measures:
  • The development of an easier approach to aspirating the knee may lead to improved accuracy of intraarticular needle placement by less experienced practitioners and more "anatomically difficult" knees. [ Time Frame: 1 time (intraop) ]

Enrollment: 20
Study Start Date: January 2008
Study Completion Date: August 2009
Primary Completion Date: August 2009 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Experimental: Transpatellar Approach Procedure: Transpatellar Approach
The transpateller approach for the injection of the dye will be used.
Active Comparator: Suprapatellar Approach Procedure: Suprapatellar
The suprapatellar approach will be used for the injection of the dye.


Ages Eligible for Study:   18 Years to 80 Years   (Adult, Senior)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • undergoing elective arthroscopic surgery of the knee
  • age greater than 18 years old and less than 80 years old
  • able to consent to a research study

Exclusion Criteria:

  • allergy to contrast dye, iodine or shellfish
  • currently pregnant
  • acute fracture or dislocation
  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its identifier: NCT00888368

United States, Colorado
Denver Health Medical Center
Denver, Colorado, United States, 80204
Sponsors and Collaborators
Denver Health and Hospital Authority
  More Information

Responsible Party: Denver Health and Hospital Authority Identifier: NCT00888368     History of Changes
Other Study ID Numbers: DHMC07-0387
Study First Received: April 23, 2009
Last Updated: July 11, 2012 processed this record on August 21, 2017