Konstantinos Papadopoulos* and Russell Kabir
Anglia Ruskin University, Allied and Public Health Department, Faculty of Medical Sciences, UK
Received: 27 October, 2016; Accepted: 05 November, 2016; Published: 07 November, 2016
Dr Konstantinos Papadopoulos, Anglia Ruskin University, Allied and Public Health Department, Faculty of Medical Sciences, Chelmsford, CM1 1SQ, UK, Tel: +44 (0) 01245 68442; E-mail:
Papadopoulos K, Kabir R (2016) Physiotherapy Effectiveness on Muscle Strength, Flexibility, Pain and Function in Patients with Patellofemoral Pain Syndrome. J Nov Physiother Phys Rehabil 3(1): 035-039. DOI: 10.17352/2455-5487.000033
© 2016 Papadopoulos K, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Patellofemoral Pain Syndrome; Pain; Function; Strengthening; Stretching; Physiotherapy effectiveness
Study objectives: To evaluate the effectiveness on muscle strength, flexibility, pain and function of a six-week physiotherapy treatment for patients with Patellofemoral Pain Syndrome delivered in a district North-West Wales National Health Service Hospital.
Methods: 26 patients with Patellofemoral Pain Syndrome (9 males, 16 females) who were referred to the NHS physiotherapy department where asked to complete an AKP Scale and two VASs along with a series of clinical tests that measure lower limb isometric strength and flexibility in two different occasions; The first occasion took place directly after the first treatment session with the physiotherapist; the second occasion took place directly after the last physiotherapy visit which was approximately after 5-8 weeks.
Results: The data showed that physiotherapy treatment in patients with PFPS did not improve strength (measured by the lower limb isometric strength tests or flexibility (measured by the modified Thomas and hamstrings flexibility test) however; pain measured by two VASs (one for usual pain and one for pain on the day of the assessment) and function measured by the AKP Scale function, were significantly improved (VASs p<0.02 & AKP Scale p<0.01 ).
Conclusions: This study reported that physiotherapy treatment in patients with PFPS works, not through strength and flexibility but through other components. There are several possible explanations for the results of this study. Future studies should aim to identify the different treatment components and which of these really work for patients with PFPS.
Patellofemoral Pain Syndrome (PFPS) is one of the most common knee conditions that physiotherapists and physicians have to confront Houghton, 2007. PFPS often becomes chronic, with up to 91% of patients reporting constant knee pain 4-18 years after being diagnosed , whilst 5 years after rehabilitation, 80% still reported pain and 74% had reduced their activity level . A search of the literature did not reveal previous research studies which have investigated the effectiveness of the National Health Service (NHS) physiotherapy treatment of PFPS in a non- academic setting. The last update of the physiotherapy standards of proficiency , reported that registered physiotherapist should use specific practice skills such as exercise and movement to enhance functional ability. Literature showed a number of different treatment components that clinical physiotherapists are suggested to use when treating patients with PFPS and all of them included strengthening and stretching of several muscles [4-6]. Previous research identified the clinical methods that North-West Wales (NWW) physiotherapists use when treating patients with PFPS . In that study NWW physiotherapists reported using a selection of physical activities aimed at strengthening and stretching lower limb muscles. However, there was no evidence about the effectiveness of such treatment in NHS physiotherapy departments. Harvie et al. , reported in their review that a six-week intervention should be considered for programmes targeting patients with PFPS. In addition, literature  and bibliography , suggest that six weeks can be enough if intense and specific strength and flexibility programs. This study not only will reveal the effect of a six-week physiotherapy treatment in district NWW NHS hospitals, but will also provide answers to the efficacy of this exercise-based treatment to the PFPS population who visit district physiotherapy clinics.
The aim of this study was:
• To investigate the effect on muscle strength, flexibility, pain and function of a six week programme of physiotherapy for PFPS delivered in a district NWW NHS hospital.
Recruitment method: All potential participants were identified by an extended scope physiotherapist who searched the NHS physiotherapy referrals (MB). An invitation letter and an information sheet were then sent to them. Potential participants were phoned by the rheumatologist (JJ) and if they were interested the phone was passed to the researcher who arranged a meeting after the first physiotherapy appointment. Participants were given at least two days to decide whether to participate. The first assessment took place directly after the first treatment session with the physiotherapist; the second assessment took place directly the last physiotherapy visit which was approximately after 5-8 weeks.
Ethical approval was granted by the local NHS research ethics committee (10/WNo01/60). Informed consent was obtained from all participants before data collection was initiated.
Participant inclusion/exclusion criteria
The inclusion criteria for all patients were to be:
• Referred by a general practitioner or a consultant for assessment and treatment of PFPS
• Aged between 18 to 50 years old
• Able to communicate in English.
• Able to participate in both sessions (First and last visit time at the physiotherapy department)
The exclusion criteria for the PFPS group included the presence of other knee conditions such as knee ligament conditions/menisci conditions, history of trauma, previous knee surgery, history of true locking, history of patellar dislocation, history of arthritis, knee joint effusion, patellar tendinopathy, or the inability to attend all sessions .
After participants had received their first session of physiotherapy they met the researcher who was blinded to the patients’ diagnoses and asked them to complete a consent form. Details of the participants’ weight, height and age were recorded. Participants were then asked to complete a series of questionnaires and scales. Following this, a number of physical tests were performed.
After they had received their final treatment and were ready for discharge, participants filled in the questionnaire and scales again and repeated the clinical tests. In addition, after the follow-up session all participants received £10 in high street vouchers. Participants completed a form confirming they had received the vouchers.
Questionnaires and scales
The Anterior Knee Pain Scale (AKPS) , is a very common scale in the assessment of PFPS . This scales has been designed to measure dysfunction, disability and pain whilst in the past, it has been used in several PFPS studies showing high reliability (r>0.9) [13,14].
Along with the AKPS, two more VASs for usual pain and for pain on the day of the assessment were also used. Participants were asked to pencil vertically on a 10-cm line (from ‘no pain’ to ‘pain as bad as it could possibly be’) according to the usual pain and the pain they had on the day of the assessment. The questionnaire and the VASs were completed at both sessions.
Two tests were performed:
• The Modified Thomas test measuring hip and knee flexion.
This test is designed to report tightness of iliopsoas and quadriceps. To measure iliopsoas tightness, the axis of the goniometer (Absolute Axis, Baseline, New York, USA) was positioned on top of the greater trochanter, with one arm placed parallel to the longitudinal axis of femur and the other arm parallel to the mid-axillary line of the trunk. To measure quadriceps tightness, the axis of the goniometer was placed on the head of the fibula on the examined leg, with one arm being parallel to the longitudinal axis of the tibia pointing toward the lateral malleolus and the other parallel to the longitudinal axis of femur pointing towards the greater trochanter. The non-examined leg was fully flexed and held by the participant’s hands while the tested leg was extended by gravity. The maximal hip extension and knee flexion range of motion values were recorded when the gravity could not further extend the hip and flex the knee. No additional passive movement was performed by the researcher’s hands in either hip extension or knee flexion . A more positive hip angle value represents more severe tightness of iliopsoas whereas a more positive knee extension angle represents more severe tightness of quadriceps.
• The hamstrings flexibility test.
This test measures the flexibility of the hamstrings. Participants were in supine position. Two straps were placed, one on the non-examined leg; across the thigh and a second over the anterior superior spines of the ilia to stabilize the pelvis. A line was drawn between the fibular head and lateral malleolus of the leg. This line represented the longitudinal axis of the leg and was a reference of accurate placement of the goniometer. The examiner placed the hip to 90 degrees (confirmed by a goniometer) whilst participants held their knee flexed and the foot in plantar flexion. Then, with the hip stabilized at 90 degrees, participants actively extended the knee until they reached initial mild resistance. The angle of the knee was then recorded by the goniometer as the flexibility of the hamstring muscles .
Participants were then asked to complete a series of strength tests on a portable dynamometer which has been found to be reliable and valid . Seven contractions (each of them lasting for five seconds) were completed for each test. The first three were a warm up of 25%, 50% and 75% of their maximum strength followed by four maximal voluntary contractions (MVCs). Only the strongest MVC was recorded. There was a 30 seconds rest between contractions and a two-minute rest between tests. The researcher encouraged the participants verbally.
The tests involved:
• Isometric knee extensions from sitting position with the knee extended to 600.
This test measures the strength of the quadriceps muscles. Participants were placed in a sitting position with the knee extended at 60 degrees of full length extension and asked to forcibly extend their knee against the dynamometer. The hip was flexed at 90 degrees whilst the trunk, pelvis and foot were strapped tight with belts .
• Isometric hip external rotation from supine position with the tested leg rotated externally to 5 degrees.
In supine position with both knees fully extended and the tested leg externally rotated to 5 degrees, participants were asked to rotate the foot externally against the resistance of the dynamometer. The pelvis and the tested knee were strapped with belts as no pelvic movement or knee flexion were allowed .
• Isometric hip abduction from ‘clam’ position.
The set up for the ‘clam’ test was the same as the isometric hip abduction from ‘clam’ test position. All participants were asked to perform 2 sets of 30 concentric hip abduction repetitions (60 degrees/sec) against the resistance of the isometric dynamometer. The range of motion was from 0 to 30 degrees. The mean score of the 30 repetitions was calculated (N x m/weight) .
Functional stress protocol
Participants then performed a functional stress protocol involving two sets of 30 repetitions from a ‘clam’ position to 30 degrees of hip abduction with a red thera-band® (The Hygenic corporation, Akron Ohio, USA) around both of their knees. The red thera-band® (4 pounds force in 100% elongation) is the elastic band the physiotherapists use in the clinic when they prescribe resistance exercises to their participants. The band was tied tightly around the knees. During the protocol the researcher held a t-shape standing measure which was adjusted to show each participant the position of 30 degrees of hip abduction. The knee had to touch the t-shape tool on each repetition of the protocol. There was a two-minute break between the two sets.
As soon as the functional stress protocol was completed two more maximum isometric contractions from ‘clam’ test position were immediately performed using the portable dynamometer. The first contractions was used to identify how much the functional stress protocol had reduced the participant’s activity and the second, which took place two minutes later, was used to assess the rate of recovery.
Data and statistical analysis
A goniometer (Absolute Axis, Baseline, New York, USA) was used to measure all flexibility tests in degrees, while for the strength tests a peak value was measured using chart 5® software for windows. Only the highest out of the 4 MVCs was used for analysis. The strength produced was normalized by participant weight.
Paired t-tests were used to identify the effect of physiotherapy treatment in patients with PFPS after a six-week physiotherapy treatment.
The effect size ‘r’ was also measured by using the Cohen’s d given by the equation:
where χ pre was the average mean of pre-treatment, χ post was the average mean of post-treatment and SD was the Standard Deviation . When using this equation the effect sizes ‘r’ of .20 are small, .50 are medium, and .80 are large. Chi-square tests for the diagnostic tests before and after treatment were also performed whilst paired t-tests were performed to identify difference between pre and post ‘clam’ activity; before and after treatment.
The study was approved by the ethics committee of the School of Sport Health and Exercise Sciences and the Betsi Cadwaladr University Health Board (10/WNo01/60).
26 patients with PFPS were referred by a consultant or general practitioner to NWW physiotherapy department were recruited after the recruitment procedure explained in the methods. Table 1, shows the characteristics of the PFPS patients. Only 4 PFPS patients reported permanent pain, while the rest (22) reported on/off pain.
Questionnaire and scales
The AKPS showed significant improvement in PFPS patients after they received their treatment. The two VAS (the VAS for the pain on the day of the assessment and the VAS for usual pain) showed significant change after treatment.
The analysis of the flexibility tests showed that there was no significant effect (p<0.05) of the six-week treatment on the length of the quadriceps and iliopsoas muscles. Additionally, the effect sizes ‘r’ were small for all tests (Table 2).
The series of strength tests showed that there was no difference after treatment (Table 2). Figure 1 displays the strength results. Strength tests similar to flexibility tests reported small effect sizes ‘r’.
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