AUTHOR'S ARTICLE: The Initial Investigation of The Church Pew Exercise To Facilitate Quadriceps Function Following Total Knee Arthroplasty

Reading continuous information on continuing education laws, no matter how interesting, can take a toll on you and sometimes you just want to read an interesting article that's not spitting out words like requirement, state board, and deadline. So let's change the dial and rock to a new tune today. The following article was provided by Dr. John O'Halloran DPT, PT, OCS, Cert MDT, ATC, CSCS. This revealing piece focuses on exercise findings for TKA patients.

INTRODUCTION
500,000 total knee replacements are performed in the USA annually.

• Knee replacements are expected to rise to 3 million by 2030.
• When surveyed, total knee replacement patients rate their satisfaction as very high when the studied question is inquiring about pain differences pre and post surgery. In contrast to the self-reported outcomes, functional performance measures, such as the timed stair-climbing or walking test, depict only modest improvements following TKA.
• Total knee arthroplasty (TKA) reduces pain and improves health-related quality of life in 90% of patients.
• However, when these same patients are asked about function, they rate their satisfaction very low one-year post knee replacement.
• The goals of total knee arthroplasty are to decrease pain, improve functional mobility, such as walking, stair climbing and to promote the return to physical activity. It is well established that TKA reduces pain post surgery however 30% of patients report dissatisfaction in their physical abilities one year following the surgery.
• Statistically, one year after post-op TKA patients walk 18% slower and climb stairs 51% slower and have quadriceps deficits of nearly 40% than their age-matched non-total knee counterparts.
• Approximately 75% of TKA patients report difficulty negotiating stairs.
• Another staggering statistic is that 24% of total knee patients fall in the first year.
• In 2000, Lingard reported that only 26% of TKA patients are referred to outpatient rehabilitation following total knee arthroplasty.
• Based on the information above, it is imperative that today’s rehabilitation programs for TKA need to be critically examined and a new thinking process is implemented. Failure to do so can definitely impede the ability of the TKA patient’s long-term functional abilities.

QUADRICEPS FUNCTION
Individuals with knee osteoarthritis, prior to undergoing a traditional Total Knee Arthroplasty, on average, have a 20% quadriceps deficit. It has been reported that at one year that deficit is 40% despite standard rehabilitation programs. Investigators have linked the decline in walking speed, stair climbing ability and falls to the persistent quadriceps deficit. Researchers who have incorporated neuromuscular electrical stimulation (NMES) into the postoperative rehabilitation to augment traditional strengthening exercises found that patients who had the NMES walked and performed stairs faster and had fewer torque deficits than those patients who did not incorporate NMES into the rehabilitation program.

So, what is it about the NMES? To answer this we must first review some basic electrical stimulation modality principles, as well as the effects postoperative effusions, can have on quadriceps inhibition. NMES selectively recruits fast twitch type II muscle fibers before slow-twitch type I fibers. Type II fibers are the first to atrophy following disuse immobilization. So can we speculate that the selective fiber recruitment of the NMES provides the necessary neural drive to the quadriceps muscle, thus reducing the inhibitory effects of disuse immobilization following TKA surgery? Can we also clinically reason that postoperative NMES delivered to the quadriceps has a muscle pumping effect, thus reducing effusion?

All my life I have been curious about how things worked and what were the common denominators to successful methods. My question was now: how can I implement this information to enhance my clinical outcome if I do not have an NMES unit? I do not want to deprive my patient of this evidence. Therefore we must create an alternative therapeutic approach. That approach is the neuromuscular exercise I developed. The exercise is the CHURCH PEW EXERCISE.

When you watch our patient walk, I really would like for you to focus on his stride length pre and post CHURCH PEW EXERCISE and his walking speed.

Joint Replacement Quadricep Facilitation Exercise-"The Church Pew":
It has been documented in the literature that, prior to a knee replacement surgery, the patient can have at least a 20% quadricep deficit. This deficit persists following a total knee replacement. Traditional knee replacement exercises do not specifically address the neural inhibition that occurs in the quadriceps muscle. The persistent inhibition of the quadriceps muscle affects a total knee replacement patient’s walking and stair climbing abilities. The "church pew" exercise facilitates the quadriceps by causing an involuntary muscle contraction, just the way the quadriceps muscle functions during the gait cycle. Traditional quadricep exercises are volitional contractions and thus do not stimulate the muscle functionally.

The "church pew" exercise is a great way to get that neurological-re-education and augment the traditional exercises. The church pew exercise is for neuromuscular re-education of the quadriceps and augments all the other traditional quadricep exercises. I recommend that you assess your patient's gait before and after the exercise and document the change in stance time, speed and the patient's subjective comments post exercise.

CHURCH PEW EXERCISE
Following my investigation of the quadriceps deficit that occurs following total knee arthroplasty and the review of the literature of implementing NMES I decided to explore: where exactly does the TKA patients gait deviate? I studied many hours of TKA patients gait and concluded that those patients that had a gait deviation in stance phase resulted in a two to a five-inch excursion at initial contact to mid-stance. Patients either had a genu recurvatum or a flexion moment type gait upon initial contact to weight acceptance.

Another interesting finding was that the patients I studied all had a different ankle strategy than non-TKA patients. The TKA patients consistently had a more rigid ankle from initial contact through stance phase. The patients I looked at were on average 6-9 weeks post and was either ambulating with a cane or no assistive device. The ankle was stiff and they would strike, deviate into recurvatum or slight flexion buckle. All of the patients that I studied had full extension passively and at least good quadriceps strength with manual muscle testing.

My objective was to create an exercise that promoted an involuntary quadriceps contraction at the specific functional position that total knee patients gait deviates. So over a course of two months, I experimented with various methods of implementing the CHURCH PEW EXERCISE. Patients perform the exercise for 30 seconds, 60 seconds and 90 seconds and there was no change in their gait speed or stair climbing speed. However when they tried it for 2 minutes there was a change, so I tried 3 minutes and found it to be no more effective than 2, I settled on 2 minutes. I then proceeded to study the Church Pew and compare it to patients who did not perform the exercise. Below are my initial investigation findings. The most striking finding was that during the sway (lowering) phase of the exercise both the quadriceps and hamstrings were working virtually in a co-contraction manner.

I then randomly assigned patients to two groups post TKA. Both groups had patients who were at least 3 weeks post TKA and not more than 7 weeks. The patients were from various orthopedic surgeons in Greensboro, North Carolina. They all underwent the traditional surgical approach. All patients went through the same rehabilitation regimen and kinetic activities. However, the 22 patients in the investigational group performed the CHURCH PEW EXERCISE for 2 minutes, 4 times per day for 3 weeks. My investigation wanted to look at whether patients who performed the CHURCH PEW EXERCISE would have faster walking and stair climbing times. My outcome measurements were the Ten Meter Walk Test –TMWT and the 12 Step Stair Test.

INITIAL INVESTIGATION –EMG FINDINGS OF THE CHURCH PEW EXERCISE-CPE

RESULTS

• A sample of 22 patients-TKA
• Age 58-83, 14 females 8 males
• Acute increases of 17% for TMWT (Ten Meter Walk Test) and 18% improvement in 12 Step Stair Test

CONCLUSION

When observing this very initial evidence it appears that the church pew exercise might be more relevant to improve activation of the quadriceps during weight acceptance.

So the question we should be asking ourselves is how a simple exercise like the CHURCH PEW EXERCISE could acutely improve TKA patients’ walking speed and stair climbing abilities? I would like to discuss a couple of thoughts I have. First of all, the CHURCH PEW EXERCISE facilitates an involuntary quadriceps contraction at the specific angle of motion that the lower extremity goes through during gait. This result in a neural drive to the kinetic chain that does not exist with any of the standard therapeutic and kinetic activities performed during TKA rehab. I believe that triggering this neuromuscular drive enhances the effectiveness of the traditional hypertrophy exercises clinicians use to strengthen patients and improve gait following total knee arthroplasty.

I also strongly feel that the CHURCH PEW EXERCISE facilitates ankle mobility that is often lacking following TKA. As stated previously, TKA patients tend to hold their ankle in a rigid position at initial contact through push off. This results in the inability of the kinetic chain to properly go through the necessary supination at initial contact, pronation at midstance and re-supination at push off. If the ankle joint is held rigid, the sequence of the gait cycle is obviously compromised. The CHURCH PEW EXERCISE allows the natural femoral and tibia rotational movements during gait creating the necessary stride length, cadence, and proprioception.

My findings also are in agreement with the Blade et al article that stressed that more progressive rehabilitation programs need to be performed following total knee arthroplasty. Today, knee arthroplasty is being performed with advanced surgical techniques such as computer-assisted guidance and minimally invasive approaches, therefore, it is imperative that the rehabilitation clinician augments these advances with corrective therapeutic exercises and activities that facilitate functional outcomes far superior to what has been reported in the literature to date.

REFERENCES

O'’Halloran is the author of these two HomeCEU Seminars-On-Demand courses:
- Joint Replacement Rehabilitation for the Shoulder, Hip and Knee Arthroplasty (7 contact hours)
- Evaluation and Treatment of the Shoulder Complex (5 contact hours)

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