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PNF Stretching for TKA on ROM

The recruitment status of this study is unknown. The completion date has passed and the status has not been verified in more than two years.
Verified November 2008 by National Taiwan University Hospital.
Recruitment status was:  Not yet recruiting
Information provided by:
National Taiwan University Hospital Identifier:
First received: November 24, 2008
Last updated: NA
Last verified: November 2008
History: No changes posted

To investigate immediate and short term effects on angle of knee flexion, intensity of pain, strength of the knee extensor, and function of the lower extremity by using PNF stretching technique in patients with total knee arthroplasty.

hypothesis:TKA patients may increase ROM after PNF stretching

Condition Intervention
Total Knee Arthroplasty
Procedure: PNF stretching
Procedure: passive stretching

Study Type: Interventional
Study Design: Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Double Blind (Participant, Outcomes Assessor)
Primary Purpose: Treatment
Official Title: The Effects of PNF Stretching on Knee Motion Following TKA

Resource links provided by NLM:

Further study details as provided by National Taiwan University Hospital:

Primary Outcome Measures:
  • knee flexion angle [ Time Frame: baseline and follow up ]

Secondary Outcome Measures:
  • VAS pain score [ Time Frame: baseline and follow up ]
  • knee extensor strength [ Time Frame: baseline and follow up ]
  • time up and go test time [ Time Frame: baseline and follow up ]
  • KOOS score [ Time Frame: baseline and follow up ]

Estimated Enrollment: 60
Study Start Date: December 2008
Estimated Study Completion Date: December 2008
Estimated Primary Completion Date: December 2008 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Experimental: 1
PNF stretching x 5 repetitions for 3 days
Procedure: PNF stretching
PNF stretching x 5 repetitions and continue 3 days
Active Comparator: 2
passive stretching
Procedure: passive stretching
passive stretching x 5 repetitions continue 3 days

Detailed Description:

Proprioceptive neuromuscular facilitation(PNF) is defined as a treatment method that promotes or hastens the response of the neuromuscular mechanism through stimulation of proprioceptors within the related muscles or joints. PNF stretching technique is a therapeutic technique using the PNF concept to the related muslces either to increase neuro-inhibition mechanism for releasing muscle spasm and elongating muscle length, or to increase neuro-excitation mechanism for enhancing muscle strength. Improvement in range of motion using PNF stretching technique has been reported superior to other techniques in previous literature, but those studies have only been done in healthy adults. Less is known in the effect of PNF stretching on improvement in joint restriction. Range of motion limitation usually disturbed the patients with total knee arthroplasty. PNF stretching techniques has been used frequently for patients with total knee arthroplasty in clinical practice to increase range of motion effectively and reduced knee pain during exercise. However there is no evidence-based research in such a technique for patients with total knee arthroplasty. This research project, therefore, will explore application of PNF stretch in changes of knee flexion, pain, muscle strength, and function of the lower extremity following total knee arthroplasty.

Purposes: To investigate immediate and short term effects on angle of knee flexion, intensity of pain, strength of the knee extensor, and function of the lower extremity by using PNF stretching technique in patients with total knee arthroplasty.

Method: Sixty patients who received total knee arthroplasty in National Taiwan University Hospital will be recruited in this study. They will be allocated randomly into either experimental or control groups. Conventional physical therapy will be given to all participants. Besides, the experimental group will assume PNF stretching technique from the third post-operative day to the day of discharge. This technique will be executed by the same physical therapist, including 5 trials of isometric knee extension for 6 s, followed by active knee flexion to the maximum range immediately, and holding for 10s. The rest interval will be 10 s. For the control group, passive stretch technique with the same treatment time will be given, instead. All participants will be asked to do home exercises after discharged from the hospital. The outcome measures will be given before and after the first session treatment on the same day, on the day of discharge, and one month after the operation. The variables measured will be (1) knee flexion angle measured with a universal goniometer, (2) maximum voluntary isometric strength of the knee extensor measured with a hand-held dynamometer, (3) pain score using pain visual analog scale, (4) function performance of the lower extremity measured with timed up and go test, (5) Knee Injury and Osteoarthritis Outcome Score (KOOS) to record 5 dimensions including the symptoms, stiffness, pain, difficulties in knee functions and/or daily activities, limitations in sports or recreational participation, and quality of life.


Ages Eligible for Study:   Child, Adult, Senior
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • OA knee
  • primary unilateral TKA

Exclusion Criteria:

  • knee flexion>110 or thigh girth > 55 cm
  • poor cognition
  • CNS or PNS neuromuscular disease
  • received operation in recent 3 months
  • joint infection and loosening
  • revision total knee arthroplasty
  • complication during follow up
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Please refer to this study by its identifier: NCT00797875

Contact: Shiun-Jeng Lin 0939803219

National Taiwan University Hospital Not yet recruiting
Taipei, Taiwan, 100
Contact: Huei-Ming Chai, PHD    02-33228140   
Sponsors and Collaborators
National Taiwan University Hospital
Principal Investigator: Huei-Ming Chai, PHD Nation Taiwan University Hospital
  More Information

Responsible Party: Chai Huei-Ming, National Taiwan University Hospital Identifier: NCT00797875     History of Changes
Other Study ID Numbers: 200803064R
Study First Received: November 24, 2008
Last Updated: November 24, 2008

Keywords provided by National Taiwan University Hospital:
proprioceptive neuromuscular facilitation stretching technique, total knee arthroplasty, range of motion processed this record on April 28, 2017