Reliability, validity, and responsiveness of four knee outcome scales for athletic patients

Physical activity levels after characterized chondrocyte implantation versus microfracture in the knee and the relationship to objective functional outcome with 2-year follow-up

BACKGROUND

Characterized chondrocyte implantation results in superior structural repair compared with microfracture, but may be associated with a slower recovery of physical activity levels due to the arthrotomy.

HYPOTHESES

Our hypotheses were that (1) microfracture results in increased activity levels over 2 years after surgery compared with characterized chondrocyte implantation, (2) patients with high preinjury activity levels have a better functional outcome, and (3) high levels of low-load activities after surgery improve functional outcome.

STUDY DESIGN

Cohort study; Level of evidence, 2.

METHODS

Sixty-seven patients with local cartilage defects (mean size, 2.4 cm(2); standard deviation, 1.5 cm(2)) of the femoral condyle underwent characterized chondrocyte implantation (n = 33) or microfracture (n = 34), followed by an identical rehabilitation protocol. Activity levels (assessed using the Activity Rating Scale) and functional outcome were determined at baseline, and 1 and 2 years after surgery. Functional outcome was based on the pooled symmetry index (derived from isokinetic knee extension strength and 3 one-legged hop tests). Patients' participation in low-load activities during the first 3 months after surgery was assessed using rehabilitation data. Mixed linear model analyses and Wilcoxon rank sum tests were used.

RESULTS

Activity levels in patients treated with characterized chondrocyte implantation and microfracture were comparable at 1 and 2 years after surgery. Preinjury activity levels showed no relationship to functional outcome. Lack of postoperative low-load activities resulted in a significantly worse functional outcome (mean pooled symmetry index 78.2%) compared with high levels of postoperative surgery low-load activities (mean pooled symmetry index 92.4%).

CONCLUSION

Despite differences between the characterized chondrocyte implantation and microfracture procedures, patients' activity levels were comparable at 2 years after surgery. Lack of low-load activities after surgery adversely affected functional outcome.

The long-term effect of 2 postoperative rehabilitation programs after anterior cruciate ligament reconstruction: a randomized controlled clinical trial with 2 years of follow-up

BACKGROUND

There is no consensus regarding the optimal postoperative rehabilitation program after anterior cruciate ligament (ACL) reconstruction.

PURPOSE

The purpose of this study was to examine the long-term outcome of a 6-month neuromuscular exercise (NE) training program versus a traditional strength exercise (SE) training program after ACL reconstruction.

STUDY DESIGN

Randomized controlled trial; Level of evidence, 1.

METHODS

Seventy-four patients were randomly assigned to either a NE program or a SE program and tested preoperatively and at 6 months, 1 year, and 2 years after ACL reconstruction. Outcome measurements were as follows: Cincinnati knee score, visual analog scale for pain and global function, Short Form 36, functional knee tests, and isokinetic muscle strength tests.

RESULTS

There were no significant differences between the NE and SE programs 1 and 2 years after ACL reconstruction for the primary outcome measurement (Cincinnati knee score). There were significantly improved knee function (global function) and reduced pain during activity for the NE group, compared with the SE group, and significantly improved hamstring muscle strength for the SE group, compared with the NE group, 2 years after ACL reconstruction.

CONCLUSION

On the basis of these results, a postoperative program combining both NE and SE should be included after ACL reconstruction to improve knee function.

A novel magnetic resonance imaging classification of discoid lateral meniscus based on peripheral attachment

BACKGROUND

In the symptomatic discoid lateral meniscus, the effectiveness of preoperative magnetic resonance imaging (MRI) is not well documented.

HYPOTHESIS

Magnetic resonance imaging classification will provide more information to the surgeon in choosing the appropriate treatment methods with the help of arthroscopic findings.

STUDY DESIGN

Cohort study (diagnosis); Level of evidence, 2.

METHODS

Sixty-seven patients (82 knees) were reviewed. The preoperative MRI was checked in 76 of 82 knees. The Lysholm and Ikeuchi grading scales were evaluated. Images were analyzed from MRI, and findings were classified into 4 categories: no shift, anterocentral shift, posterocentral shift, and central shift. Tear pattern classifications were based on arthroscopic findings: horizontal tear, peripheral tear, horizontal and peripheral tear, posterolateral corner loss, and others. The correlations between MRI classification tear patterns and surgical methods were analyzed using the chi-square test or the Fisher exact test. The sensitivity, specificity, and accuracy of shift in preoperative MRI-according to the existence of peripheral tear when corroborated with arthroscopy-were also analyzed with the chi-square test. Inter- and intraobserver reliability was statistically analyzed by producing the inter- and intraclass correlation coefficient.

RESULTS

The mean preoperative Lysholm score was 77.3 (range, 43-97), and the last follow-up Lysholm score had increased to 96.8 (range, 84-100; P < .001). At last follow-up (100% follow-up), the Ikeuchi grading scale scored 48 knees as excellent, 30 as good, and 4 as fair. According to the MRI classification, 43 knees were no shift; 6, anterocentral shift; 15, posterocentral shift; and 12, central shift. Shift-type knees had a significantly larger number of peripheral tears, and repairs were performed in the shift-type knees (55%) more frequently than in the no-shift-type knees (28%). Among 82 knees, 31 were repaired simultaneously after a central partial meniscectomy.

CONCLUSION

Magnetic resonance imaging classification provides more information to surgeons in choosing the appropriate treatment methods, although the final decision regarding procedure is made during arthroscopy after thorough analysis of the tear.

Adaptation and validation of Turkish version of the Knee Outcome Survey-Activities for Daily Living Scale

The Knee Outcome Survey-Activities of Daily Living Scale (KOS-ADLS), originally developed in English, is a valid and reliable self-reported instrument used for patients with various painful knee conditions. We adapted the KOS-ADLS to Turkish and tested its reliability and validity. We enrolled 142 patients with knee pain in the study. The patients were randomized into two groups: Group 1 (n = 75) completed the questionnaire twice a week for assessing test-retest reliability and Group 2 (n = 67) answered the questionnaire and performed additional tests for assessing validity. The intraclass correlation coefficient ranged from 0.98 to 0.99 with high internal consistency (Cronbach's alpha, 0.89). Validity-related tests included pain measurement with a visual analog scale and functional tests, including time measurements for the get-up-and-go and ascending/descending stairs tests. The visual analog scale score correlated with total score (r = 0.56), function total score (r = 0.53), and symptom total score (r = 0.45). The ascending/descending stairs test correlated with total score (r = 0.47), function total score (r = 0.49), and symptom total score (r = 0.31). The get-up-and-go test weakly correlated with all three scores. The Turkish version of the KOS-ADLS is reliable and valid in evaluating the functional limitations of patients with knee pain.

Outcome and knee-related quality of life after anterior cruciate ligament reconstruction: a long-term follow-up

The aim of the present investigation was to study patient-reported long-term outcome after anterior cruciate ligament (ACL) reconstruction. On an average 11.5 years after ACL reconstruction with bone-patellar tendon-bone (BPTB) autograft 56 patients were asked to answer four different questionnaires about their knee function and knee-related quality of life. Another aim was to study whether there were any correlations between clinical tests, commonly used for evaluating patients with ACL injuries, which were performed 2 years after ACL reconstruction, and patient-reported outcome in terms of knee function and knee-related quality of life on an average 9.5 years later. All patients who had unilateral BPTB ACL reconstructions were examined at 2 years and on an average 11.5 years after surgery. At 2 years one-leg hop test for distance, isokinetic muscle torque measurement, sagittal knee laxity, Lysholm knee scoring scale and Tegner activity scale were used for clinical evaluation. At the follow-up on an average 9.5 years later the patients were evaluated with knee injury osteoarthritis outcome score (KOOS), short form health survey (SF 36), Lysholm knee scoring scale and Tegner activity scale. The SF-36 showed that the patients had a similar health condition as an age- and gender-matched normal population in Sweden on an average 11.5 years after ACL reconstruction. There was no correlation between the results of one-leg hop test for distance, isokinetic muscle torque measurement, sagittal knee laxity evaluated 2 years after surgery and the result of KOOS (function in sport and recreation, knee-related quality of life) and SF-36 evaluated on an average 11.5 years after surgery. We also compared patients that 2 years after surgery demonstrated a side-to-side difference in anterior-posterior knee laxity of more than 3 mm with those with 3 mm or less and found no significant group differences in terms of knee function as determined with KOOS. We found no correlation between the results of KOOS and SF-36 at the long-term follow-up and the time between injury and surgery, age at surgery or gender, respectively. We conclude that there is no correlation between patient-reported knee function in sport and recreation and knee-related quality of life on an average 11.5 years after BPTP ACL reconstruction and the evaluation methods used 2 years after surgery.

Anterior knee pain following the lateral parapatellar approach for tibial nailing

BACKGROUND

Anterior knee pain after intramedullary nailing of tibial shaft fractures is a common clinical problem, with various etiologies. We have used a lateral parapatellar approach with atraumatic elevation of the infrapatellar fat pad to expose the starting point. Our hypothesis was that this approach leads to a low incidence of knee pain.

METHODS

We conducted a retrospective study of 78 patients suffering from tibia fractures treated by a single surgeon. Fifty patients were available for the study. All fractures were fixed with a reamed intramedullary nail using the modified lateral approach. Complaints of knee pain and range of motion as well as keeling ability were examined in the clinic visit and recorded in the patients' charts. Lysholm knee scores were collected following the last follow-up visit. Average follow-up was 13 months (range 6-26 months).

RESULTS

Nine patients (19%) had subjective anterior knee pain when directly questioned. Eighty-two percentage of patients had no difficulty kneeling and this was significantly correlated with lack of knee pain. Good or excellent knee scores were reported by 92% of patients. Average knee flexion was 130 degrees . There was a negative correlation between the presence of open fracture and outcome. No correlation was found between knee pain and nail insertion depth or coronal alignment.

CONCLUSION

The modified lateral parapatellar approach with careful dissection of the fat pad may significantly reduce anterior knee pain after intramedullary nailing of the tibial shaft.

Surplus value of hip adduction in leg-press exercise in patients with patellofemoral pain syndrome: a randomized controlled trial

BACKGROUND

A common treatment for patients with patellofemoral pain syndrome (PFPS) is strength (force-generating capacity) training of the vastus medialis oblique muscle (VMO). Hip adduction in conjunction with knee extension is commonly used in clinical practice; however, evidence supporting the efficacy of this exercise is lacking.

OBJECTIVE

The objective of this study was to determine the surplus effect of hip adduction on the VMO.

DESIGN

This study was a randomized controlled trial.

SETTING

The study was conducted in a kinesiology laboratory.

PARTICIPANTS

Eighty-nine patients with PFPS participated.

INTERVENTION

Participants were randomly assigned to 1 of 3 groups: hip adduction combined with leg-press exercise (LPHA group), leg-press exercise only (LP group), or no exercise (control group). Training consisted of 3 weekly sessions for 8 weeks.

MEASUREMENTS

Ratings of worst pain as measured with a 100-mm visual analog scale (VAS-W), Lysholm scale scores, and measurements of VMO morphology (including cross-sectional area [CSA] and volume) were obtained before and after the intervention.

RESULTS

Significant improvements in VAS-W ratings, Lysholm scale scores, and VMO CSA and volume were observed after the intervention in both exercise groups, but not in the control group. Significantly greater improvements for VAS-W ratings, Lysholm scale scores, and VMO volume were apparent in the LP group compared with the control group. There were no differences between the LP and LPHA groups for any measures.

LIMITATIONS

Only the VMO was examined by ultrasonography. The resistance level for hip adduction and the length of intervention period may have been inadequate to induce a training effect.

CONCLUSIONS

Similar changes in pain reduction, functional improvement, and VMO hypertrophy were observed in both exercise groups. Incorporating hip adduction with leg-press exercise had no impact on outcome in patients with PFPS.

The reliability, validity, and responsiveness of the Lysholm score and Tegner activity scale for anterior cruciate ligament injuries of the knee: 25 years later

BACKGROUND

In 1982, the Lysholm score was first published as a physician-administered score in the American Journal of Sports Medicine. The Tegner activity scale was published in 1985.

HYPOTHESIS

The Lysholm and Tegner scores are valid as patient-administered scores and responsive at early time points after treatment of anterior cruciate ligament tears.

STUDY DESIGN

Cohort study (Diagnosis); Level of evidence, 1.

METHODS

All patients were treated for an anterior cruciate ligament tear. For responsiveness, the Lysholm score (n = 1075) and Tegner activity level (n = 505) were measured preoperatively and 6, 9, 12, and 24 months postoperatively. For test-retest (n = 50), scores were measured at 2 years postoperatively and again within 4 weeks by questionnaire. For criterion validity (n = 170), patients completed the Short Form-12 and the International Knee Documentation Committee score in addition to Lysholm and Tegner instruments. For all other analyses, preoperative Lysholm score (n = 1783) or Tegner activity levels (n = 687) were collected.

RESULTS

There was acceptable test-retest reliability for both the Lysholm (intraclass correlation coefficient = 0.9) and Tegner (intraclass correlation coefficient = 0.8) scores. The minimum detectable change for Lysholm was 8.9 and for Tegner was 1. The Lysholm demonstrated acceptable internal consistency. The Lysholm correlated with the International Knee Documentation Committee (r = .8) and the Short Form-12 (r = .4), and Tegner correlated with the Short Form-12 (r = .2). Both scores had acceptable floor and ceiling effects and all hypotheses were significant. The Lysholm and Tegner were responsive to change at each of the time points.

CONCLUSION

After 25 years of changes in treatment of anterior cruciate ligament injuries, the Lysholm knee score and the Tegner activity scale demonstrated acceptable psychometric parameters as patient-administered scores and showed acceptable responsiveness to be used in early return to function after anterior cruciate ligament treatment.

Patella fracture during rehabilitation after bone-patellar tendon-bone anterior cruciate ligament reconstruction: 2 case reports

STUDY DESIGN

Case report.

BACKGROUND

Patellar fracture is a rare but significant complication following anterior cruciate ligament (ACL) reconstruction when using a bone-patellar tendon-bone (BPTB) autograft. The purpose of these case reports is to describe 2 cases in which patellar fracture occurred during rehabilitation after ACL reconstruction using a BPTB.

CASE DESCRIPTION

Both patients were 23-year-old males referred for rehabilitation after ACL reconstruction using a BPTB autograft. They were both progressing satisfactorily in rehabilitation until sustaining a fracture of the patella. One fracture occurred during the performance of the eccentric phase of a knee extension exercise during the sixth week of rehabilitation (7 weeks postsurgery), whereas the other fracture occurred during testing of the patient is quadriceps maximum voluntary isometric contraction in the ninth week of rehabilitation (10 weeks postsurgery). Both patients were subsequently treated with open reduction and internal fixation of the patella.

DISCUSSION

During rehabilitation following ACL reconstruction using BPTB autograft, clinicians should consider the need to balance the sometimes-competing goals of improving quadriceps strength while providing protection to the healing graft, minimization of patellofemoral pain, and protection of the patellar donor site.

Associates of physical function and pain in patients with patellofemoral pain syndrome

OBJECTIVES

To explore whether impairment of muscle strength, soft tissue length, movement control, postural and biomechanic alterations, and psychologic factors are associated with physical function and pain in patients with patellofemoral pain syndrome (PFPS).

DESIGN

Cross-sectional study.

SETTING

Rehabilitation outpatient.

PARTICIPANTS

Seventy-four patients diagnosed with PFPS.

INTERVENTIONS

Not applicable.

MAIN OUTCOME MEASURES

Measurements were self-reported function and pain; strength of quadriceps, hip abduction, and hip external rotation; length of hamstrings, quadriceps, plantar flexors, iliotibial band/tensor fasciae latae complex, and lateral retinaculum; foot pronation; Q-angle; tibial torsion; visual observation of quality of movement during a lateral step-down task; anxiety; and fear-avoidance beliefs.

RESULTS

After controlling for age and sex, anxiety and fear-avoidance beliefs about work and physical activity were associated with function, while only fear-avoidance beliefs about work and physical activity were associated with pain.

CONCLUSIONS

Psychologic factors were the only associates of function and pain in patients with PFPS. Factors related to physical impairments did not associate to function or pain. Our results should be validated in other samples of patients with PFPS. Further studies should determine the role of other psychologic factors, and how they relate to anxiety and fear-avoidance beliefs in these patients.

Responsiveness of the activities of daily living scale of the knee outcome survey and numeric pain rating scale in patients with patellofemoral pain

OBJECTIVE

To assess internal and external responsiveness of the Activity of Daily Living Scale of the Knee Outcome Survey and Numeric Pain Rating Scale on patients with patellofemoral pain.

DESIGN

One group pre-post design.

SUBJECTS

A total of 60 individuals with patellofemoral pain (33 women; mean age 29.9 (standard deviation 9.6) years).

METHODS

The Activity of Daily Living Scale and the Numeric Pain Rating Scale were assessed before and after 8 weeks of physical therapy program. Patients completed a global rating of change scale at the end of therapy. The standardized effect size, Guyatt responsiveness index, and the minimum clinical important difference were calculated.

RESULTS

Standardized effect size of the Activity of Daily Living Scale was 0.63, Guyatt responsiveness index was 1.4, area under the curve was 0.83 (95% confidence interval: 0.72, 0.94), and the minimum clinical important difference corresponded to an increase of 7.1 percentile points. Standardized effect size of the Numeric Pain Rating Scale was 0.72, Guyatt responsiveness index was 2.2, area under the curve was 0.80 (95% confidence interval: 0.70, 0.92), and the minimum clinical important difference corresponded to a decrease of 1.16 points.

CONCLUSION

Information from this study may be helpful to therapists when evaluating the effectiveness of rehabilitation intervention on physical function and pain, and to power future clinical trials on patients with patellofemoral pain.

Knee injury outcomes measures

Outcomes measures have long been used in the assessment of knee injuries and management protocols. In the past decade, there has been a shift from clinician-based outcomes tools to the development and validation of patient-reported outcomes measures. General health as well as disease- and medical condition-specific outcomes measures have been so modified. The Medical Outcomes Study 36-Item Short Form is the most commonly used general health measure in orthopaedics. Joint-specific measures include the Western Ontario and McMaster Universities Osteoarthritis Index, the Knee Injury and Osteoarthritis Outcome Score, and the International Knee Documentation Committee Subjective Form. The Lysholm Knee Scale and the Cincinnati Knee Rating Scale continue to be popular, especially for the assessment of ligamentous injuries. The ACL Quality of Life score is a disease-specific, patient-reported outcomes measure of anterior cruciate ligament deficiency. The historically used Tegner activity level scale and the recently developed Marx activity level scale are used in conjunction with these outcomes measures to make possible a global assessment of recovery from knee injuries and clinician interventions.

Isolated knee pain: a case report highlighting regional interdependence

STUDY DESIGN

Case report.

BACKGROUND

A number of pain referral patterns for sacroiliac dysfunction have been reported in the literature. However, very little has been written about pain localized to the knee joint for cases involving sacroiliac dysfunction.

CASE DESCRIPTION

A 25-year-old female runner was self-referred to physical therapy for medial knee pain of 4(1/2) weeks' duration without a significant onset event. The pain completely curtailed her training for the Boston Marathon. Examination of the patient's knee and hip did not reveal any abnormal findings and there was no reproduction of pain with any test procedures except for medial knee joint tenderness to palpation. Additional, more proximal examination suggested significant asymmetry of sacral bony landmarks of the pelvic girdle without significant findings on the provocation tests of the sacroiliac joint. A single session of manual therapy procedures directed to the pubic symphysis and sacroiliac joint ipsilateral to the side of knee pain was provided.

OUTCOMES

The patient was able to return to running without further incident of knee pain after a single therapy session.

DISCUSSION

This case suggests the importance of regional interdependence in the examination of patients with an apparently common clinical problem. Furthermore, the case describes a previously unreported presentation of local knee pain possibly attributable to sacroiliac joint dysfunction.

Cross-cultural adaptation and validation of the Portuguese version of the Knee Outcome Survey-Activities of Daily Living Scale (KOS-ADLS)

The objective of this study was to cross-culturally adapt and validate the Portuguese version of the Knee Outcome Survey-Activities of Daily Living Scale (KOS-ADLS). This version was obtained with forward/backward translations, consensus panels and pre-testing. The Portuguese KOS-ADLS and Medical Outcomes Study, 36-item Short Form (SF-36) questionnaires, visual analogue scales (VAS) of pain, disability and discomfort, and a form for patient's characteristics were administered to 168 subjects with knee osteoarthritis (OA). Reliability was acceptable (Cronbach's alpha = 0.91; ICC = 0.97). There were significant correlations with SF-36 physical component subscales, all VAS, and duration of knee OA. The subjects with bilateral knee OA and that need walking aids obtained lower scores (p < 0.001). No floor/ceiling effects were detected. Responsiveness to physical therapy was showed (standardized effect size = 0.62; standardized response mean = 1.02). The Portuguese KOS-ADLS evidenced acceptable reliability, validity, floor/ceiling effects, and responsiveness.

An evaluation of the clinical tests and outcome measures used to assess patellar instability

A literature review was undertaken to determine which clinical tests and outcome measures have been described to diagnose and evaluate patellar instability, and to assess the literature examining the sensitivity and specificity of these diagnostic tests, or the reliability, validity and responsiveness of the outcome measures identified. An electronic search was undertaken using standard databases as well as a hand search of specialist journals, reference lists and local medical libraries. All English language publications describing and/or evaluating diagnostic tests and outcome measures for patellar instability patients were included. On review, 104 papers and 64 textbooks were included. Eighteen diagnostic tests and 10 outcome measures were identified. Of these only five diagnostic tests (Bassett's sign; apprehension test; gravity subluxation test; clinical assessment of the tibial tubercle to trochlear groove value; Q-angle) and seven outcome measures (modified International Knee Documentation Committee knee ligament standard evaluation form; Kujala anterior knee pain scale; Fulkerson knee instability scale; Lysholm knee scoring scale; Tegner activity level scale; Short Form-36; Musculoskeletal Function Assessment injury and arthritis survey) had been assessed for accuracy in five studies. The sensitivity, specificity, reliability or validity, of these tests remains unclear for this patient population. Further work is needed to assess the appropriateness of the identified tests and outcomes for patellar instability cohorts.

Measuring arthroscopic outcome

In order to measure and report clinical research results, we require the ability to measure our results, and we label our measurement tools "outcome measures." Options are many and include clinician-reported and patient-reported measures. Patient-reported measures include measures of symptoms (such as pain), measures of activity and function (such as work ability or sports participation), and measures of general health status (such as quality of life). Measures of symptoms and measures of activity and function may be specified as joint or region, and disease or injury, specific. We recommend that clinical outcome studies include a combination of these measures. In addition, clinical outcome measures should be practical, widely accepted, reliable, valid and responsive. Finally, the evidence for reliability, validity and responsiveness should be specific to the disease and/or population of interest.

Magnetic resonance imaging and clinical evaluation of patellar resurfacing with press-fit osteochondral autograft plugs

BACKGROUND

Autologous osteochondral transplantation (AOT) has been successfully used in the femoral condyle and trochlea and is an attractive treatment option for full-thickness patellar cartilage lesions.

HYPOTHESIS

Patients treated with AOT for the repair of symptomatic, isolated patellar cartilage lesions will demonstrate improvement in functional outcomes and postoperative magnetic resonance imaging appearance.

STUDY DESIGN

Case series; Level of evidence, 4.

METHODS

Between 2002 and 2006, patients with focal patellar cartilage lesions treated with AOT were prospectively followed. The mean age at the time of surgery was 30 years. Clinical assessment was performed with the International Knee Documentation Committee (IKDC), activities of daily living of the Knee Outcome Survey (ADL), and Short Form-36 (SF-36) at baseline and most recent follow-up. Magnetic resonance imaging was used to evaluate the cartilage repair morphologic characteristics in 14 cases.

RESULTS

Twenty-two patients met the study criteria with a mean follow-up of 28.7 months (range, 17.7-57.8 months). The mean patellar lesion size was 165.6 +/- 127.8 mm(2), and the mean size of the donor plug was 9.7 +/- 1.1 mm in diameter with 1.8 +/- 1.4 plugs/defect. The mean preoperative IKDC score was 47.2 +/- 14.0 and improved to 74.4 +/- 12.3 (P = .028). The mean preoperative ADL score was 60.1 +/- 16.9 and increased to 84.7 +/- 8.3 (P = .022). The mean SF-36 also demonstrated an improvement, from 64.0 +/- 14.8 at baseline to 79.4 +/- 15.4 (P = .059). Nine patients underwent concomitant distal realignment and demonstrated improvement between preoperative and postoperative outcomes scores, but these differences were not statistically significant. Magnetic resonance imaging appearance demonstrated that all plugs demonstrated good (67%-100%) cartilage fill, 64% with fissures < 2 mm at the articular cartilage interface, 71% with complete trabecular incorporation, and 71% with flush plug appearance.

CONCLUSION

Patellar AOT is an effective treatment for focal patellar chondral lesions, with significant improvement in clinical follow-up. This study suggests that patients with patellar malalignment may represent a subset of patients who have a poor prognostic outlook compared with patients with normal alignment.

Diagnosis and management of a patient with knee pain using the movement system impairment classification system

STUDY DESIGN

Case report.

BACKGROUND

Selecting the most effective conservative treatment for knee pain continues to be a challenge. An understanding of the underlying movement system impairment that is thought to contribute to the knee pain may assist in determining the most effective treatment. Our case report describes the treatment and outcomes of a patient with the proposed movement system impairment (MSI) diagnosis of tibiofemoral rotation.

CASE DESCRIPTION

The patient was a 50-year-old female with a 3-month history of left anteromedial knee pain. Her knee pain was aggravated with sitting, standing, and descending stairs. A standardized clinical examination was performed and the MSI diagnosis of tibiofemoral rotation was determined. The patient consistently reported an increase in pain with activities that produced abnormal motions or alignments of the lower extremity in the frontal and transverse planes. The patient was educated to modify symptom-provoking functional activities by restricting the abnormal motions and alignments of the lower extremity. Exercises were prescribed to address impairments of muscle length, muscle strength, and motor control proposed to contribute to the tibiofemoral rotation. Tape also was applied to the knee in an attempt to restrict tibiofemoral rotation.

OUTCOMES

The patient reported a cessation of pain and an improvement in her functional activities that occurred with correction of her knee alignment and movement pattern. Pain intensity was 2/10 at 1 week. At 10 weeks, pain intensity was 0/10 and the patient reported no limitations in sitting, standing, or descending stairs. The patient's score on the activities of daily living scale increased from 73% at the initial visit to 86% at 10 weeks and 96% at 1 year after therapy was discontinued.

DISCUSSION

This case report presented a patient with knee pain and an MSI diagnosis of tibiofemoral rotation. Diagnosis-specific treatment resulted in a cessation of the patient's pain and an improved ability to perform functional activities.

Long-term functional outcome after lateral patellar retinacular release in adolescents: an observational cohort study with minimum 5-year follow-up

BACKGROUND

Lateral patellar retinacular release has been recommended for patients with patellar tilt, tight lateral retinaculum, patellar subluxation, patellar dislocation, and patellofemoral pain. Studies of long-term outcomes after lateral release are limited, especially for differing indications.

HYPOTHESIS

Adolescents do well after lateral retinacular release in the 5- to 22-year time frame.

METHODS

Patients having undergone lateral retinacular release between the years of 1981 and 1999 were contacted. Evaluation was by the Cincinnati and Lysholm scales and by level of satisfaction and need for reoperation.

RESULTS

One hundred forty knees were studied. Mean age at operation was 15.4 years (SD, 2.7 years). Average follow-up was 8.5 (SD, 4.1 years; range, 5.2-22.5 years). Twenty-five patients had needed reoperation, indicating failure of the index operation. Kaplan-Meier survivorship was 78% at 15 years. Cincinnati and Lysholm scores indicated well-functioning knees in those not requiring reoperation. Overall satisfaction improved as time from operation increased. Comparisons were made between the group requiring reoperation and those who did not. Focus was placed on knees with patellar maltracking or tilt versus patellar instability and between males and females. No differences were found among groups for reoperation rate, level of satisfaction, average Lysholm score, or average Cincinnati score. There were no differences in demographics or outcome measures between patients with patellar instability and those with tilt. Instability patients trended toward higher reoperation rates than did tilt patients, but the difference was not significant. There were no differences between males and females.

CONCLUSION

The majority of patients are satisfied with their knee 5 to 22 years after lateral patellar retinacular release and scored well on questions rating knee health and function.

Self-efficacy of knee function as a pre-operative predictor of outcome 1 year after anterior cruciate ligament reconstruction

The knee self-efficacy scale (K-SES) has been shown to have good reliability, validity and responsiveness during rehabilitation for patients' perceived self-efficacy of knee function. Determinants of self-efficacy of knee function 1 year after ACL reconstruction have been found to be the patients' internal locus of control and knee symptoms in sports and recreation. The predictive ability of perceived self-efficacy of knee function measured by the K-SES has not been studied in terms of patient outcome after an ACL reconstruction. The purpose of this study was to explore the potential for pre-operative self-efficacy of knee function measured by the K-SES to predict patient outcome in terms of physical activity, knee symptoms and muscle function 1 year after an ACL reconstruction. Thirty-eight patients were evaluated for outcome in terms of physical activity with the Tegner activity scale and the physical activity scale (PAS), knee symptoms with the Lysholm knee scoring scale and the knee injury and osteoarthritis outcome score (KOOS) and knee function with ability tests for muscle function 1 year after ACL reconstruction. Multiple regression and logistic multiple regression analysis were used to evaluate the K-SES as a possible predictor of outcome. The patients' present perceived self-efficacy of knee function (K-SES(Present)) pre-operatively was a significant predictor (P = 0.016) of the patients returning to their intensity and frequency of physical activity (PAS) 1 year after ACL reconstruction, when adjusted for age, gender and pre-injury physical activity level (Tegner(Pre-injury)) (odds ratio = 2.1). The patients' perceived future self-efficacy of knee function (K-SES(Future)) pre-operatively was a significant predictor (P = 0.045) of their self-rated knee function in sports/recreational activities (KOOS(Sports/recreation)) at the 1-year follow-up, when adjusted for age, gender and Tegner(Pre-injury )(R (2 )=0.25). The pre-operative K-SES(Future) was also a significant predictor (P = 0.023) of the patients' knee-related quality of life (KOOS(Qol)), at the 1-year follow-up, when adjusted for age, gender and Tegner(Pre-injury) (R (2 )=0.23). The pre-operative K-SES(Future) was furthermore a significant predictor of an acceptable outcome 1 year after surgery, on the Lysholm knee scoring scale (P = 0.003, odds ratio = 1.7), as well as on KOOS(Sports/recreation) (P = 0.002, odds ratio = 1.6) and knee-related quality of life (KOOS(Qol)) (P = 0.037, odds ratio = 1.4), when adjusted for age, gender and Tegner(Pre-injury). The pre-operative K-SES(Future) was also a significant predictor (P = 0.04) of an acceptable outcome 1 year after surgery, on the one-leg hop for distance (odds ratio = 2.2), when adjusted for age, gender and Tegner(Pre-injury). In conclusion, this study indicates that patients' perceived self-efficacy of knee function pre-operatively is of predictive value for their return to acceptable levels of physical activity, symptoms and muscle function 1 year after ACL reconstruction.

Lysholm scale and WOMAC index were responsive in prospective cohort of young general practice patients

OBJECTIVE

To determine the construct validity and responsiveness of the Lysholm knee scoring scale and the WOMAC osteoarthritis index in adolescents and young adults with knee complaints in general practice.

STUDY DESIGN AND SETTING

In the framework of a prospective cohort study with 1-year follow-up, we included 314 patients aged 12-35 years consulting the general practitioner for incident knee complaints. Subgroup analyses of traumatic and nontraumatic knee complaints and of adolescents and adults were performed.

RESULTS

Construct validity was adequate for both questionnaires both in traumatic and nontraumatic patients (aged 12-35) and in adolescents (12-17) and young adults (18-35). Effect size (ES) and standardized response mean (SRM) for both Lysholm and WOMAC global scores were moderate in nontraumatic patients and high in traumatic patients. Guyatt's responsiveness statistic was high in both subpopulations. Adolescents showed high responsiveness with all measures on the Lysholm scale, and moderate (Guyatt's statistic) to high responsiveness (ES and SRM) on the WOMAC index. Young adults showed high responsiveness with all measures on both instruments.

CONCLUSION

Although neither of the scales was developed for use in adolescents and young adults in general practice, both scales show adequate responsiveness, content, and construct validity in this population.

Rasch analysis of the Knee injury and Osteoarthritis Outcome Score (KOOS): a statistical re-evaluation

The knee injury and Osteoarthritis Outcome Score (KOOS), based on the Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC), is widely used to evaluate subjective outcome in anterior cruciate ligament (ACL) reconstructed patients. However, the validity of KOOS has not been assessed using Rasch analysis. The objective of this study was to evaluate the viability of KOOS as an outcome measure for ACL reconstruction using the partial credit Rasch model. Rasch analysis was applied to 200 KOOS questionnaires completed by patients consecutively tested 20 weeks after ACL reconstruction and subsequent rehabilitation. Rasch analysis showed that of the five proposed subscales in KOOS, only knee-related quality of life (QoL) and sport and recreational related function (Sport/Rec) fulfilled the criteria of a unidimensional measurement scale when applied to these patients. The three subdomains in KOOS extracted from WOMAC did not fulfill these criteria. While the content of KOOS appears to be relevant for knee patients, the psychometric measurement properties of KOOS are insufficient for use on patients 20 weeks subsequent to ACL reconstruction. A new knee measure targeted for these patients could be developed based on the content of KOOS. This study demonstrates that knee measurement instruments constructed for a specific condition cannot necessarily be used on patients with other similar conditions.

Prognosis of conservatively managed anterior cruciate ligament injury: a systematic review

Anterior cruciate ligament (ACL) rupture is a common sporting injury, often managed surgically with patella-tendon or hamstrings-gracilis autograft. Some people who sustain the injury, request information about their prognosis if they choose to forgo surgery and opt for conservative management. Numerous studies provide data on the prognosis of conservatively managed ACL injuries. These studies have not been systematically reviewed. Thus, the aims of this systematic review are to describe the natural history and clinical course of function and proprioception in the conservatively managed ACL-deficient knee, and to identify prognostic factors. We searched MEDLINE, CINAHL, EMBASE, SportDiscus, PEDro and the Cochrane Central Register of Clinical Trials without language restrictions from the earliest record available up to July 2006. We also searched the Science Citation Index, and iteratively searched bibliographies for prospective studies of outcomes (>6 months follow-up) of conservatively managed complete ACL tears. Six criteria were used to assess the methodological quality of included studies. The main outcome measures were self-reported measures of knee function, activity level, performance in functional tasks and knee proprioception. Fifteen studies of variable methodological quality were included in the review. On average, patients with mixed or isolated ACL-deficient knees reported good knee function (87/100 Lysholm knee scale) at follow-up duration of 12-66 months. On average, functional performance assessed with the hop-for-distance test, was in the normal range. From pre-injury to follow-up there was a reduction in Tegner activity level of 21.3%. According to the methods used in the assessed studies, conservatively managed ACL-deficient knees have a good short- to mid-term prognosis in terms of self-reported knee function and functional performance. However, subjects reduced their activity levels on average by 21% following injury.

Development of a German version of the knee outcome survey for daily activities

INTRODUCTION

The knee outcome survey-activities of daily living scale (KOS-ADLS) is a patient-reported specific measure of knee function. The KOS-ADLS includes items related to both symptoms and functional limitations experienced during ADL. The purpose of this study was to examine the reliability and validity of a cross-culturally adapted German version of the KOS-ADLS.

MATERIALS AND METHODS

108 consecutive knee patients (n = 57 males/51 females) scheduled for outpatient physical therapy at an orthopedic hospital were enrolled in the investigation. For the reliability analysis, 50 patients were asked to complete the questionnaire on two non-consecutive days. To assess the validity of the KOS-ADLS, 58 additional patients answered the questionnaire in addition to performing a series of other related tests: (1) visual analogue scale for knee pain intensity, (2) The Get-up-and Go, and (3) time for ascending/descending stairs. The functional tests were selected because they directly related to specific items in the questionnaire and were thought to reflect the major areas of disability for this patient group.

RESULTS

The reliability analysis demonstrated that the German version of the KOS-ADLS had a good reliability (ICC range 0.94-0.97) and internal consistency (alpha 0.89). The functional tests (e.g. Get-up and Go, ascending/descending stairs) showed moderate correlations, whereas the visual analogue pain scale was highly correlated with the subscores and total score of the KOS-ADLS.

CONCLUSION

The psychometric characteristics of the German version of the KOS-ADLS produced reliable and valid results, as the original version, in detection of an individual's symptom and function related knee joint impairment.

Combined autologous chondrocyte implantation and allogenic meniscus transplantation: a biological knee replacement

Meniscus deficient knees develop early osteoarthritis in the knee. Autologous Chondrocyte Implantation has provided a new dimension to the treatment of chondral defects in the knee, with 85% good to excellent results and a long-term durable outcome of up-to 11 years. However, it is contraindicated in meniscus deficient knees. Allogenic Meniscus Transplantation gives good symptomatic relief in meniscus deficient knees, with a success rate of 89%. However, it is contraindicated in advanced cartilage degeneration. We hypothesized that combination of these two might be a solution for bone-on-bone arthritis in young individuals. We studied a consecutive series of eight patients, with mean age of 43 years, presenting with large kissing chondral defects, secondary to the previous meniscectomy. All the patients were treated with a combination of Autologous Chondrocyte Implantation and Allogenic Meniscus Transplantation. Mean pre-operative Lysholm score was 49, which rose to mean of 66 at 1 year, an average increase by 16.4 points. Six patients showed significant improvement at one year. MRI scans showed good integration of the menisci with the capsule, without any rejection. Histology confirmed the integration. All the patients could lead an active life-style. Five patients maintained the improvement at a mean follow-up of 3.2 years. We could not find any deleterious effects of the combination of these two techniques. So we conclude that the combination of these two techniques together may act a one step towards a true biological knee replacement.

Knee-specific quality-of-life instruments: which ones measure symptoms and disabilities most important to patients?

BACKGROUND

Knee-specific quality-of-life instruments are commonly used outcome measures. However, they have not been compared for their ability to detect symptoms and disabilities important to patients.

STUDY DESIGN

Cohort study (diagnosis); Level of evidence, 1.

METHODS

Subjective portions of 11 knee-specific instruments were consolidated. The frequency and importance of each item were assessed. One hundred fifty-three patients with anterior cruciate ligament ruptures, isolated meniscal tears, or osteoarthritis were polled. Instruments were ranked according to the number of items with high mean importance, high frequency importance product, and low mean importance, and according to the number endorsed by at least 51% of patients.

RESULTS

For anterior cruciate ligament tears, the Mohtadi quality-of-life instrument scored highest in 3 categories. For meniscal tears, the Western Ontario Meniscal Evaluation Tool scored highly in all 4 categories. For osteoarthritis, the Western Ontario and McMaster Universities Osteoarthritis Index scored highly in 4 categories. Of the general knee instruments, the International Knee Documentation Committee Standard Evaluation Form and the Knee Injury and Osteoarthritis Outcome Score scored favorably.

CONCLUSION

The Mohtadi quality-of-life instrument, Western Ontario Meniscal Evaluation Tool, and Western Ontario and McMaster Universities Osteoarthritis Index-disease-specific instruments-contain many items important to patients. Of general knee instruments studied, the International Knee Documentation Committee Standard Evaluation Form and the Knee Injury and Osteoarthritis Outcome Score contain the most items important to patients.

CLINICAL RELEVANCE

This study guides clinicians and researchers in selecting instruments that ensure that the patient's perspective is considered for outcome studies involving 3 common knee disorders.

Reliability and validity of the International Knee Documentation Committee (IKDC) Subjective Knee Form

BACKGROUND

Patient-oriented questionnaires are important measures of clinical outcomes in medical practice but require systematic testing of reliability and validity. The International Knee Documentation Committee (IKDC) Subjective Knee Form is a patient-oriented questionnaire that assesses symptoms and function in daily living activities. The purpose of this study was to validate the IKDC Subjective Knee Form in a large patient population with various knee disorders.

METHODS

One thousand five hundred and thirty-four knee patients seen at a sports medicine clinic at a large medical center completed the IKDC Subjective Knee Form. Factor structure was determined by exploratory factor analysis with promax rotation, and internal consistencies of the identified subscales were calculated with Cronbach's alpha. Concurrent validity was assessed by correlating the IKDC Subjective Knee Form dimensions to the summary scales of the SF-12. Finally, item characteristics were analysed using graded response item response theory (G-IRT).

RESULTS

Exploratory factor analyses yielded a two-factor solution, and the dimensions were termed as follows: symptom and knee articulation (SKA), and activity level (AL). Confirmatory factor analysis confirmed the selection of 15 items within the study. Both SKA and AL demonstrated good internal consistency (0.87 for SKA; 0.88 for AL). Both SKA and AL demonstrated statistically significant correlations to the SF-12 total score, more substantively to the physical component summary scale than to the mental component summary scale of the SF-12.

DISCUSSION

G-IRT analyses revealed that nearly all questionnaire items demonstrated clear response patterns, with higher levels of the latent trait corresponding to more adaptive clinical endpoints concerning pain, symptoms, function, and sport activity.

CONCLUSIONS

The IKDC is a reliable and valid instrument worthy of consideration for use in a broad patient population.

The impact of disease-related impairments on disability and health-related quality of life: a systematic review

Background

To investigate the interchangeability of measures of disability and health-related quality of life (HRQL) by comparing their associations patterns with disease-related impairment measures in patients with a variety of conditions.

Methods

A systematic literature search of MEDLINE, EMBASE, Web of Science and a hand search of reference lists through January 2006. Studies were included if they reported associations patterns between impairment and disability and between impairment and HRQL. Correlation coefficients were transformed to Fisher's z effect size (ES(z)). Weighted averages were reported as pooled ES(z) with 95% confidence intervals (CI).

Results

The relationship between impairment and disability was stronger (pooled ES(z) = 0.69; 95% CI, 0.66 – 0.72) than between impairment and HRQL (pooled ES(z) = 0.38; 95% CI, 0.36 – 0.41). The physical component score (pooled ES(z) = 0.43; 95% CI, 0.39 – 0.47) and disease-specific HRQL (pooled ES(z) = 0.46; 95% CI, 0.40 – 0.51) were stronger associated with impairments than the mental component score (pooled ES(z) = 0.28; 95% CI, 0.20 – 0.36) and generic HRQL (pooled ES(z) = 0.36; 95% CI, 0.33 – 0.39).

Conclusion

This study shows measures of disability and different HRQL domains were not equally related to impairment. Patient's impairments are better reflected in disability measures, than in HRQL instruments. There are many outcomes of interest and precisely defining them and measuring them will improve assessing the impact of new interventions.

Neuromuscular training versus strength training during first 6 months after anterior cruciate ligament reconstruction: a randomized clinical trial

BACKGROUND AND PURPOSE

The purpose of this study was to determine the effect of a 6-month neuromuscular training (NT) program versus a traditional strength training (ST) program following anterior cruciate ligament (ACL) reconstruction.

SUBJECTS

Seventy-four subjects with ACL reconstruction participated in the study.

METHODS

The study was a randomized, single-blinded, controlled trial. The NT and ST groups were tested preoperatively and at 3 and 6 months. The main outcome measure was the Cincinnati Knee Score. Secondary outcome measures were visual analog scales (VASs) for pain and function, the 36-Item Short-Form Health Survey (SF-36), hop tests, isokinetic muscle strength, proprioception, and static and dynamic balance tests.

RESULTS

The NT group demonstrated significantly improved Cincinnati Knee Scores and VAS scores for global knee function compared with the ST group at the 6-month follow-up. There were no significant differences between the groups for the other outcome measures (ie, hop, balance, proprioception, and muscle strength tests).

DISCUSSION AND CONCLUSION

The results of this study suggest that exercises included in the NT program should be part of the rehabilitation program following ACL reconstruction.

Arthroscopic or conservative treatment of degenerative medial meniscal tears: a prospective randomised trial

In this prospective randomised study two treatments after non-traumatic medial meniscal tear diagnosed with radiological examination and magnetic resonance imaging were compared; arthroscopic partial meniscectomy followed by supervised exercise or supervised exercise alone. The aim was to evaluate knee function and physical activity. Ninety patients (mean age 56 years) were evaluated using the Knee Injury and Osteoarthritis Outcome Score, the Lysholm Knee Scoring Scale, the Tegner Activity Scale and a Visual Analogue Scale for knee pain prior to the intervention, after 8 weeks of exercise and after 6 months. According to the outcome scores arthroscopic partial medial meniscectomy combined with exercise did not lead to greater improvement than exercise alone. After the intervention both groups reported decreased knee pain, improved knee function and a high satisfaction (P<0.0001). Forty-one per cent of the patients returned to their pre-injury activity level after 6 months. In conclusion, when evaluated with outcome scores, arthroscopic partial medial meniscectomy followed by supervised exercise was not superior to supervised exercise alone in terms of reduced knee pain, improved knee function and improved quality of life.

The 36-item short form

The use of patient-derived, objective outcome measures has expanded substantially within the orthopaedic literature. Quality-of-life instruments are categorized as general health or as condition-specific questionnaires. The Medical Outcomes Study 36-Item Short Form (SF-36) is a general health-based survey of quality of life. It has been validated, is used widely across medical disciplines, and can be self-administered by the patient with reliability. The SF-36 has been implemented to define disease conditions, to determine the effect of treatment, to differentiate the effect of different treatments, and to compare orthopaedic conditions with other medical conditions. However, a bias of lower over upper extremity function has been demonstrated with the SF-36, as have limitations in assessment of certain physical activities of daily living as well as upper and lower limits on the detection of certain changes in quality-of-life status. Nevertheless, with an adequate knowledge of its effectiveness and limitations, the SF-36 can be a useful tool in many branches of orthopaedic surgery.

The clinimetric qualities of patient-assessed instruments for measuring chronic ankle instability: a systematic review

Background

The assessment of outcomes from the patient's perspective becomes more recognized in health care. Also in patients with chronic ankle instability, the degree of present impairments, disabilities and participation problems should be documented from the perspective of the patient. The decision about which patient-assessed instrument is most appropriate for clinical practice should be based upon systematic reviews. Only rating scales constructed for patients with acute ligament injuries were systematically reviewed in the past. The aim of this study was to review systematically the clinimetric qualities of patient-assessed instruments designed for patients with chronic ankle instability.

Methods

A computerized literature search of Medline, Embase, Cinahl, Web of Science, Sport Discus and the Cochrane Controlled Trial Register was performed to identify eligible instruments. Two reviewers independently evaluated the clinimetric qualities of the selected instruments using a criteria list. The inter-observer reliability of both the selection procedure and the clinimetric evaluation was calculated using modified kappa coefficients.

Results

The inter-observer reliability of the selection procedure was excellent (k = .86). Four instruments met the eligibility criteria: the Ankle Joint Functional Assessment Tool (AJFAT), the Functional Ankle Outcome Score (FAOS), the Foot and Ankle Disability Index (FADI) and the Functional Ankle Ability Measure (FAAM). The inter-observer reliability of the quality assessment was substantial to excellent (k between .64 and .88). Test-retest reliability was demonstrated for the FAOS, the FADI and the FAAM but not for the AJFAT. The FAOS and the FAAM met the criteria for content validity and construct validity. For none of the studied instruments, the internal consistency was sufficiently demonstrated. The presence of floor- and ceiling effects was assessed for the FAOS but ceiling effects were present for all subscales. Responsiveness was demonstrated for the AJFAT, FADI and the FAAM. Only for the FAAM, a minimal clinical important difference (MCID) was presented.

Conclusion

The FADI and the FAAM can be considered as the most appropriate, patient-assessed tools to quantify functional disabilities in patients with chronic ankle instability. The clinimetric qualities of the FAAM need to be further demonstrated in a specific population of patients with chronic ankle instability.

Self-Reported Patient Outcomes after ACL Reconstruction with Allograft Tissue

PURPOSE

Self-reported outcomes after primary ACL reconstruction using allograft tissues were compared at > or = 5 yr (group 1) and at 2-4 yr (group 2) after surgery.

METHODS

The IKDC Subjective Knee Evaluation and Current Health Assessment and the Knee Outcome Survey Activities of Daily Living Scale (KOS-ADLS) and the Sports Activity Scale (KOS-SAS) were mailed to 335 consecutive former patients at > or = 2 yr after surgery.

RESULTS

Surveys were completed and returned by 64.6% of former patients. Time after surgery for group 1 (N = 90) and group 2 (N = 116) was 7.8 +/- 2.7 and 2.8 +/- 0.8 yr, respectively. Groups did not differ for IKDC Subjective Knee Evaluation or KOS-ADLS scores, although group 1 displayed a lower mean KOS-SAS score. Pooled IKDC Subjective Knee Evaluation scores were 42.7% normal (A), 22.8% nearly normal (B), 24.8% abnormal (C), or 9.7% severely abnormal (D). Pooled standardized IKDC Subjective Knee Evaluation z scores were -0.80 +/- 1.4 standard deviations below the reported population mean for unimpaired individuals with 33.5% scoring at or above the normative population mean, 28.2% scoring < 1 standard deviation below the normative population mean, 18.8% scoring between 1 and 2 standard deviations below the normative population mean, and 19% scoring > or = 2 standard deviations below the normative population mean. Pooled KOS-ADLS scores were 62.1% (> or = 90%), 18% (89-80%), 10.2% (79-70%), and 9.7% (< 70%). Pooled KOS-SAS scores were 49.5% (102/206, > or = 90%), 25.7% (53/206, 89-80%), 9.7% (20/206, 79-70%), and 15.1% (31/206, < 70%). Groups displayed comparable knee function before injury and at the time of the survey. Pooled knee-function scores decreased from 9.5 +/- 1.6 before injury to 8 +/- 2.5 current function (84% return). Both groups displayed decreases in current sports activity level from strenuous to moderate and frequency from 4-7 to 1-3 times per week.

CONCLUSIONS

Self-reported outcomes did not differ between groups for the IKDC Subjective Knee Evaluation or for the KOS-ADLS score, although group 1 displayed decreased mean KOS-SAS scores, suggesting decreased perceived sporting activity knee function at > or = 5 yr after surgery. Decreased sports activity level and frequency are comparable with self-reported outcome studies after primary ACL reconstruction using autograft tissues.

Responsiveness of the foot function index, AOFAS clinical rating systems, and SF-36 after foot and ankle surgery

BACKGROUND

There is uncertainty regarding which outcomes tools should be used to report the results of treatment for patients with foot and ankle disorders. This study compared the responsiveness of the Foot Function Index (FFI), American Orthopaedic Foot and Ankle Society (AOFAS) Clinical Rating Systems, and Medical Outcomes Study Short Form-36 (SF-36) in patients with foot and ankle surgery.

METHODS

Twenty-five patients were recruited at a tertiary referral foot and ankle practice. The mean age of the patient sample was 40 years (range 21 to 69) and 19 were women (76%). Thirteen patients (52%) had conditions affecting the ankle, hindfoot, or midfoot, while 12 patients (48%) had conditions affecting the forefoot. Patients completed packets preoperatively and 6-months postoperatively which included informed consent forms, the FFI, the AOFAS, and the SF-36 questionnaires. Standardized response means (SRM) and effect sizes (ES) were used as the measures of responsiveness and were calculated for the AOFAS scores, the three domains of the FFI, the eight SF-36 sub-scales, and the two SF-36 summary scales.

RESULTS

The standardized response mean (SRM) for the AOFAS scores was 1.10 and the effect size (ES) was 1.12. The SRM for the three FFI domains ranged from -0.39 to -0.83, while the ES ranged from -0.55 to -0.86. The SRM for the SF-36 ranged from 0.09 to 0.72 (ES ranged from 0.09 to 0.77) with the highest values occurring with the Bodily Pain sub-scale (SRM 0.72, ES 0.77) and Physical Component Summary scale (SRM 0.76, ES 0.68).

CONCLUSIONS

This study demonstrated increased responsiveness of foot and ankle specific outcomes tools compared to the SF-36. However, the Bodily Pain sub-scale and Physical Component Summary scale of the SF-36 had levels of responsiveness approaching those of the FFI and AOFAS Systems after foot and ankle surgery. This suggests that the SF-36 may be used alone to monitor the outcomes in these patients without sacrificing adequate sensitivity to clinical change.

High-impact athletics after knee articular cartilage repair: a prospective evaluation of the microfracture technique

BACKGROUND

Knee articular cartilage injuries in athletes present a therapeutic challenge and have been identified as an important cause of permanent disability because of the high mechanical joint stresses in athletes.

PURPOSE

To determine whether microfracture treatment of knee articular cartilage injuries can return athletes to high-impact sports and to identify the factors that affect the ability to return to athletic activity.

STUDY DESIGN

Case series; Level of evidence, 4.

METHODS

Thirty-two athletes who regularly participated in high-impact, pivoting sports before articular cartilage injury were treated with microfracture for single articular cartilage lesions of the knee. Functional outcome was prospectively evaluated with a minimum 2-year follow-up by subjective rating, activity-based outcome scores, and the ability for postoperative participation in high-impact, pivoting sports.

RESULTS

At last follow-up, 66% of athletes reported good or excellent results. Activity of daily living, Marx activity rating scale, and Tegner activity scores increased significantly after microfracture. After an initial improvement, score decreases were observed in 47% of athletes. Forty-four percent of athletes were able to regularly participate in high-impact, pivoting sports, 57% of these at the preoperative level. Return to high-impact sports was significantly higher in athletes with age <40 years, lesion size <200 mm(2), preoperative symptoms <12 months, and no prior surgical intervention.

CONCLUSION

Microfracture is an effective first-line treatment to return young athletes with short symptomatic intervals and small articular cartilage lesions of the knee back to high-impact athletics.

Knee pain after tibial nailing: the role of nail prominence

We analyzed the relationship between knee pain after tibial nailing and nail prominence. We identified 70 patients in our trauma registry with healed fractures initially treated with intramedullary nails. Subjective pain and function were measured with visual analog pain scales and Lysholm knee scores at a mean of 20 months after fracture. These scores were compared with nail prominence measured on postoperative radiographs. More than 49% of patients had knee pain. Subjective knee pain was more common in women and patients with a smaller plateau width. Anterior nail prominence was associated with increased pain at rest. Patients with superior nail prominence had increased pain with kneeling and walking. Nail prominence correlated with increased knee pain. We think surgeons can decrease, but not eliminate, the severity of knee pain after tibial nailing by burying the tip of the nail as reflected on lateral radiographs.

LEVEL OF EVIDENCE

Prognostic Study, Level II-1 (retrospective study). See the Guidelines for Authors for a complete description of levels of evidence.

Stride-to-stride variability of knee motion in patients with knee osteoarthritis

PURPOSE

Individuals with knee osteoarthritis (OA) experience pain, frontal plane joint laxity and instability. Co-contraction can control laxity and instability but may place constraints on the variability of the knee's motion during gait. Slight variation among gait cycles is normal, but reduced variability of joint motions could be detrimental. The purpose of this study was to quantify knee motion variability during gait and assess the influence of muscle activity, frontal plane laxity, and pain on knee movement variability in patients with medial knee OA.

METHODS

Fifteen subjects with unilateral medial knee OA and 15 age and gender matched uninjured subjects underwent gait analysis, with electromyography to compute co-contraction. Stress radiographs were obtained for measuring frontal plane laxity. Knee motion variability was assessed from the phase angle (knee angle versus angular velocity) during early stance.

RESULTS

Despite altered involved side knee kinematics and kinetics, individuals with knee OA showed involved side frontal plane variability which was not significantly different from the control group, but was significantly lower than the variability of the uninvolved knee's motion. Laxity and medial co-contraction influenced the amount of joint motion variability in the involved knee of the OA subjects. Pain did not influence variability.

CONCLUSION

Patients with medial knee OA displayed altered involved knee kinematics and kinetics, although stride-to-stride variability of knee motion was unchanged. Evidence of excessive joint motion variability on the uninvolved side, however, may provide insight into the development of OA in the contralateral cognate joint.

Reliability of measures of impairments associated with patellofemoral pain syndrome

BACKGROUND

The reliability and measurement error of several impairment measures used during the clinical examination of patients with patellofemoral pain syndrome (PFPS) has not been established. The purpose was to determine the inter-tester reliability and measurement error of measures of impairments associated with PFPS in patients with PFPS.

METHODS

A single group repeated measures design was used. Two pairs of physical therapists participated in data collection. Examiners were blinded to each others' measurements.

RESULTS

Thirty patients (age 29 +/- 8; 17 female) with PFPS participated in this study. Inter-tester reliability coefficients were substantial for measures of hamstrings, quadriceps, plantarflexors, and ITB/TFL complex length, hip abductors strength, and foot pronation (ICCs from .85 to .97); moderate for measures of Q-angle, tibial torsion, hip external rotation strength, lateral retinacular tightness, and quality of movement during a step down task (ICCs from .67 to .79); and poor for femoral anteversion (ICC of .45). Standard error of measurement (SEM) for measures of muscle length ranged from 1.6 degrees to 4.3 degrees. SEM for Q-angle, tibial torsion, and femoral anteversion were 2.4 degrees, 2.9 degrees, and 4.5 degrees respectively. SEM for foot pronation was 1 mm. SEM for measures of muscle strength was 1.8 Kg for abduction and 2.4 Kg for external rotation.

CONCLUSION

Several of the impairments associated with PFPS had sufficient reliability and low measurement error. Further investigation is needed to test if these impairment measurements are related to physical function and whether or not they are useful for decision-making.

Evaluation of the validity of the Foot Function Index in measuring outcomes in patients with foot and ankle disorders

BACKGROUND

There is uncertainty regarding which outcomes tools should be used to report the results of treatment for patients with foot and ankle disorders. This study evaluates the validity of the Foot Function Index (FFI) by examining its level of correlation to the Medical Outcomes Study Short Form-36 (SF-36). The SF-36 is an extensively validated outcomes tool that has been used as a benchmark in examining the validity of several orthopaedic outcomes tools.

METHODS

Seventy-three patients were recruited at a tertiary referral foot and ankle practice. Patients completed packets which included informed consent forms, the FFI, and the SF-36 questionnaires. The questionnaires were scored and Pearson correlation coefficients were determined between the three domains of the FFI and the eight SF-36 sub-scales, as well as the two SF-36 summary scales.

RESULTS

Sixty-nine patients completed an adequate number of items to be included in the study. The mean age of the patient sample was 46 (range 16 to 82) years and 44 were women (64%). Twenty-one patients (30%) had conditions affecting the forefoot, while 48 patients (70%) had conditions affecting the ankle or hindfoot. All three FFI domains had moderate to high levels of correlation to many of the SF-36 scales. The Disability domain of the FFI had the most consistent level of correlation to the SF-36 with Pearson coefficients in the range of -0.23 to -0.69. The Activity Limitation (r=-0.28 to -0.64) and Pain domains (r=-0.10 to -0.61) also demonstrated moderate levels of correlation to several of the SF-36 scales.

CONCLUSIONS

The consistently moderate to high levels of correlation of the FFI to the SF-36 seen in this study support the FFI as a valid measure of health status. This suggests that the FFI is a reasonable method to monitor patient outcomes. Future studies should focus on determining if the FFI improves responsiveness to clinical change when used in combination with generic instruments like the SF-36.

The International Knee Documentation Committee Subjective Knee Evaluation Form: normative data

BACKGROUND

The International Knee Documentation Committee Subjective Knee Evaluation Form may be used to measure symptoms, function, and sports activity for people with a variety of knee disorders, including ligamentous and meniscal injuries, osteoarthritis, and patellofemoral dysfunction. To date, normative data have not been established for this valid, reliable, and responsive outcomes instrument.

PURPOSE

To provide clinicians and researchers with normative data to facilitate the interpretation of results on the International Knee Documentation Committee Subjective Knee Evaluation Form.

STUDY DESIGN

Cross-sectional survey.

METHODS

The Subjective Knee Evaluation Form was mailed to 600 people in each of 8 age/gender categories (18-24 years, 25-34 years, 35-50 years, and 51-65 years for both male subjects and female subjects). Participants were drawn from a panel of 550 000 households (1 300 000 subjects) representative of noninstitutionalized persons in the United States and were matched to data from the United States Census Bureau on geographical region, market size, income, and household size.

RESULTS

Complete data were available for 5246 knees. Twenty-eight percent of respondents reported an injury, weakness, or other problem with one or both knees. Normative data were determined for respondents as a whole and for the subset of respondents with no history of knee problems. Mean scores were determined for men aged 18 to 24 years (89 +/- 18), 25 to 34 years (89 +/- 16), 35 to 50 years (85 +/- 19), and 51 to 55 years (77 +/- 23); mean scores were also determined for women aged 18 to 24 years (86 +/- 19), 25 to 34 years (86 +/- 19), 35 to 50 years (80 +/- 23), and 51 to 65 years (71 +/- 26). Scores were higher for the subset of respondents with no history of current or prior knee problems.

CONCLUSION

Scores on the International Knee Documentation Committee Subjective Knee Evaluation Form vary by age, gender, and history of knee problems. The normative data collected in this article will allow clinicians to interpret how patients with knee injuries are functioning relative to their age- and gender-matched peers and will enable researchers to determine the clinical outcomes of treatment.