- Research article
- Open Access
Evolution of service metrics and utilisation of objective discharge criteria in anterior cruciate ligament reconstruction rehabilitation: a retrospective cohort study with historical control in a public hospital physiotherapy department
Archives of Physiotherapy volume 10, Article number: 23 (2020)
ACL reconstruction (ACLR) is a common procedure requiring rehabilitation in public hospital physiotherapy departments. The rate of re-rupture and reduced rates of return to sport following ACLR are concerning. Current guidelines recommend a progressive approach to rehabilitation based on objective criteria. The aim of this study was to determine whether a new public hospital model of care incorporating a phase-based program increased physiotherapist utilisation of objective outcome measures, improved service metrics including attendance and rehabilitation completion rates, and increased patient-reported activity and knee function.
Records from patients attending outpatient physiotherapy after ACL reconstruction (N = 132) were included in a retrospective chart review to assess utilisation of objective measures such as quadricep and hamstring strength assessment, patient attendance and rehabilitation completion. Phone followup (minimum 1 year) was conducted to retrieve patient-reported measures of knee function (IKDC) and activity (Tegner Activity Scale). Patients were categorised by rehabilitation model of care (contemporary - time based [N = 93] vs new - phase based [N = 39]) and logistic regression used to assess the influence of patient factors and model of care on outcomes.
Compliance was equivalent between models of care and completion rates (formal discharge by therapist) were low (30–38%). The probability of a patient receiving objective strength assessment was associated with model of care, sex, BMI and number of sessions attended. The probability of a patient being recorded as discharged from the program was significantly associated with model of care, and duration and number of sessions.
Introduction of an updated model of care including a phase-based rehabilitation program increased physiotherapist utilisation of objective outcome measures in line with current ACLR rehabilitation recommendations, increased total rehabilitation duration and increased total number of sessions attended. Despite this, rehabilitation completion rates remained low, and self-reported activity and knee function remained equivalent.
Level of evidence
III, retrospective cohort study.
Anterior cruciate ligament (ACL) rupture is a common injury that usually occurs during non-contact pivoting or twisting movements of the knee [1, 2]. A ruptured ACL can result in instability and reduced functional abilities including high level sports [3, 4]. Additionally, it leads to an increased risk of developing knee osteoarthritis . Management of ACL rupture aims to restore stability and optimise patient function. Management approaches can be either conservative (exercise-based rehabilitation programs) or surgical (ACL reconstruction) (ACLR) . Regardless of management approach, ACL ruptures require prolonged rehabilitation to regain functional abilities. While the importance of ACL rehabilitation is widely accepted in the literature [1, 6,7,8] specific rehabilitation practices differ.
Variation in rehabilitation exists with respect to setting, progression, duration and return to functional activities and sport [7, 9, 10]. The literature suggests ACLR rehabilitation should address several factors including range of motion (ROM), muscle function (neuromuscular control, strength, endurance, power), performance and psychological factors [1, 9, 11, 12]. Additionally, current practice recommendations suggest rehabilitation should be progressive in nature and based on the achievement of objective outcomes and a battery of tests used to determine readiness for discharge and return to sport [1, 6, 7, 9, 11]. There is a significant risk of re-injury post ACLR, with reported re-rupture rates from 5 to 23% , and risk increasing in those returning to sport too early [1, 4]. While it is recommended to perform return to sport test batteries, their validity in reducing re-injury risk is uncertain with Webster & Hewett reporting that passing these tests may actually increase risk of contralateral ACL rupture . However, a recent revised analysis of the same articles determined that the statement by Webster & Hewett was informed by low quality evidence , and therefore it is difficult to draw a strong conclusion on the increased risk of contralateral ACL rupture. Recommended assessment measures include strength measurement of several muscle groups, hop tests and movement quality assessment . Despite these recommendations, existing literature demonstrates a disparity in discharge criteria used [15,16,17]. The optimal length of supervised rehabilitation post ACLR is currently unclear due to a lack of high-quality studies [1, 18]. Literature suggests many ACLR patients receive insufficient rehabilitation due to early discharge from services or inadequate content of rehabilitation . The level of individual physiotherapists’ experience and knowledge regarding evidence-based recommendations varies, and when considering the public healthcare setting, rehabilitation services are provided with finite resources. The aim of this study was to determine in patients electing to undergo supervised rehabilitation in a physiotherapy department in a public hospital, whether a new model of care incorporating a phase-based program, compared to standard care provided the following benefits:
Increased physiotherapist utilisation of objective outcome measures to guide clinical decision making
Improved service metrics such as attendance and rehabilitation completion rates
Increased self-reported knee function and activity levels
An observational cohort study with historical control was used to review service metrics and utilisation of objective outcome measures before and after a change in model of care for ACLR rehabilitation. Ethical approval was granted by the Metro South human research ethics committee (HREC/16/QPAH/732) prior to patient screening and data retrieval.
A list of patients who underwent primary ACLR at a metropolitan public hospital, between November 2014 and December 2017 was exported from the operating theatre management system by hospital administration (N = 262). Procedures coded as revision surgery (N = 3) and surgeries outside the specified date range (N = 35) were removed. During the chart review process, revision ACLR procedures, a primary ACLR with concurrent surgical treatment of other ligaments (PCL, LCL, MCL, PLC) and those referred to an external physiotherapy service provider on discharge from the ward were excluded (N = 92). The final list included 132 patients who had undergone ACLR and rehabilitation at the hospital outpatient physiotherapy department. The final 132 patients were split into two groups using a surgery date of 1st of November 2016 as the group cut off. This resulted in all patients in the NEW model of care undergoing all rehabilitation using the updated model of care, however there may have been some crossover in those in the CONTROL group. (CONTROL N = 93, NEW N = 39).
Clinical practice prior to model of care change (CONTROL)
Following ACLR, patients were referred to the hospital physiotherapy outpatient department for an initial appointment within 1 to 2 weeks of their surgery. Appointments were thirty minutes in duration. Follow-up appointments were completed weekly for the initial postoperative period and then at less frequent intervals depending on the treating clinicians clinical judgement. Rehabilitation was in a 1:1 format, and was guided by the individual clinician’s knowledge and clinical preferences regarding ACLR rehabilitation. During rehabilitation, patients were often assessed and treated by a number of physiotherapists with a range of experience levels.
Model of care change: phase-based rehabilitation program (NEW)
A review of ACLR rehabilitation practice in the physiotherapy department occurred in September 2016 by two physiotherapists working in the musculoskeletal outpatient setting. A new model of care was developed aiming to provide a pathway for consistent delivery of evidence-based care and enhancement of patient outcomes. A five-phase, outcome-based program was developed based on current evidence, with the included phases and outcome measures adapted from Randall Cooper’s ACL Rehabilitation Guide . The five phases include recovery from surgery, strength and neuromuscular control, running, agility and landings, return to sport and prevention of re-injury. Phase progression and discharge (return to function and sport) were based on outcome measure performance (Additional file 1). It is recognised that there is a paucity of strong evidence regarding the validity of the included outcome measures and progression criteria is largely based on expert opinion , however the use of a battery of tests including strength, hop tests and movement quality is supported in current guidelines . A suite of recommended exercises to be applied in each phase was developed. Patients were invited to participate in a combination of 1:1 and group sessions held at similar intervals to the CONTROL group. Both individual and group classes followed the same packaged model of care (Additional file 2), with the aim of improving patients’ understanding of the rehabilitation process and increasing motivation and adherence. The updated phase-based model of care was presented in departmental education sessions by the physiotherapists who led the program development and all resources made readily available to all physiotherapy outpatient staff for use in provision of care.
Pilot chart audits were completed on 50 randomly selected records to investigate availability and quality of data. Following screening for eligibility, 23 CONTROL and 2 NEW patient records were collected using a custom data collection tool (Excel, Microsoft, USA), which was adjusted following feedback from the pilot review. All time-related data was referenced from the date of surgery. After the data collection tool was finalised, the pilot charts were reviewed again using the finalised tool. Data collection for the remaining 82 patient records was then undertaken by a single physiotherapist to negate the potential for limited inter-observer reliability.
Follow-up phone calls were made between one- and three-years post-surgery to all patients who had undergone an ACLR and had received some form of rehabilitation at the physiotherapy outpatient department. Patients who completed rehabilitation, were removed due to lack of attendance, or withdrew during the rehabilitation process were contacted by a single physiotherapist using phone numbers provided by hospital administration. Data was collected regarding patient’s recollection of their rehabilitation and return to activity and sport. Reasons for patients failing to complete rehabilitation was also explored. Patients were sent an SMS advising them the research team would be attempting to call and included a link to a web-based form (Survey Monkey) asking their preferred time to be contacted. After three unsuccessful attempts to contact a patient, a web-based form (Survey Monkey) was communicated via text message for patients to complete in their own time.
‘Physiotherapist adherence to objective measures’ and ‘service metrics’ were collected via the chart audits to assess adoption of the new model of care.
The following outcome measures were recorded as assessed or not assessed (yes or no):
Quadriceps strength, (Manual muscle test (MMT) or hand-held dynamometry (HHD)) OR 1 repetition max (1RM) leg press
Hamstring strength (MMT or HHD)
Kinetic chain strength (Calf, glutes, trunk)
Hop tests (single leg hop for distance or triple crossover hop)
Balance (Star excursion balance test (SEBT) or single leg balance)
Knee range of motion (ROM)
Time to return to running (weeks)
The following service metrics were also collected to assess changes in service utilisation by patients:
Number of individual sessions attended
Number of group sessions attended
Number of failed attendances
Total occasions of service
Rehabilitation completion status
Length of physiotherapy input (weeks)
Number of clinicians
Patient reported outcomes
IKDC subjective scores, Tegner activity scores and ACL rerupture rates were collected via follow-up phone calls. The IKDC is an 18 question evaluation that measures symptoms (7 items), activities of daily living (9 items) and sport (1 item), and comparative knee function (1 item - not included in total score).
Data and statistical analysis
The completed chart review spreadsheet (Excel, Microsoft, USA) and patient followup response sheet (Sheets, Google, USA) were transferred into Matlab (Mathworks, USA) and linked by patient unique identifier (person-level linkage) into one combined dataset for analysis in a statistical software package (Minitab, Minitab Inc., USA). Categorical data was recoded to standardize spelling variations or for reasons listed (Table 1). Continuous variables were assessed for normality using Anderson-Darling tests. Patient characteristics were summarised using median and interquartile range for continuous variables and proportions for categorical variables. Patient demographics, service utlisation and patient outcomes were compared between groups using unadjusted Mann-whitney U tests for unmatched comparisons of continuous variables and X2 analysis with likelihood ratio for categorical variables with > 2 responses, or Fisher Exact test otherwise. Attendance ratios were calculated between the total number of sessions labelled failed to attend relative to the total number of sessions for each group and compared with Fisher’s exact test. Loss of knee extension was defined as 5° or greater fixed flexion angle and the proportion of positive (> 5o) measurements were compared between groups with Fisher’s exact test. Backward stepwise binary logistic regression models were constructed to compare service metrics (quadriceps and hamstrings assessment) and rehabilitation status (completed, not completed). A similar model was constructed for ipsilateral rerupture incidence with a weighting vector included to compensate for unbalanced proportions between response categories. Alpha for univariate analyses was set at 0.05, while model alpha for variable inclusion was set at 0.15. Model fit was assessed with adjusted R2 (%) and effect sizes expressed with odds ratio with 95% confidence intervals.
A sample of 132 patients were identified (combined median age 25 [IQR 20.3 - 30.8 yrs]; BMI 26.1 [23.7 -28.5 kg/m2]; 64.4% male; 42.4% Non-Australian country of origin) meeting inclusion criteria for analysis (Fig. 1). The sample was split into two groups based on surgery date, including the conventional model of care (CONTROL, N = 93) and the new model of care (NEW, N = 39). The two groups were equivalent for baseline characteristics, except for the proportion of females (48.7% NEW, 30.1% CONTROL (P = 0.04)) (Table 2).
The total number of physiotherapy sessions attended (11 vs. 8, p = 0.02) and the duration (weeks) of physiotherapy input (36.8 vs. 23.6, p = 0.01; Table 3) were the only service metrics with a significant difference between groups. The percentage of patients who completed rehabilitation and were discharged from the physiotherapy service was 30.8% NEW compared to 37.6% CONTROL (p = 0.61). Patients discharged due to a failure to attend appointments was 59% NEW compared to 49.5% CONTROL, and 10.3% NEW compared to 12.9% CONTROL (p = 0.61) withdrew from physiotherapy (Table 3). Voluntary withdrawal from rehabilitation was dominated by patients changing rehabilitation facilities (Fig. 2). Patient reasons for reduced attendance was investigated in follow-up phone calls (N = 53), with 39% stating they believed they had been discharged, while 32% found it too hard to attend (Fig. 3). The number of physiotherapists involved in patient care was not significantly different between groups, with greater than four physiotherapists involved in 64.1% of cases in NEW group compared to 46.2% in CONTROL (Table 3). Physiotherapy was supplemented by access to gym or exercise equipment in more than 50% of cases in both groups (Table 3). There was no significant difference in physiotherapy prior to surgery or ‘prehabilitation’ with 61.5% NEW compared to 55.9% in CONTROL and participation unknown in up to 36% of participants across the groups.
Physiotherapist use of objective outcome measures
The NEW model of care was associated with significantly higher rates of objective assessment of muscle strength of the quadriceps, muscles of the kinetic chain and neuromuscular control during single leg squat performance (Table 4). The assessment of hamstring capacity, balance and hop testing all increased following the model of care change but this was not statistically significant between groups. The NEW group took an average of 6 weeks longer to commence running following initial physiotherapy appointment, starting after 21.1 weeks (17.4–24.9) compared to 15.9 (12–19.3) weeks for CONTROL (Table 5).
Long term patient outcomes
There was no difference in Tegner Activity Scale scores between groups, with an average score of 8 prior to ACL rupture and 5 at follow-up. The average IKDC-Function score was consistent across both groups with 10 prior to ACL rupture and 8 at follow-up. IKDC-SKF Patient Acceptable Symptom State (PASS) was above the recommended threshold score of 75.9  in 55.6% of participants in NEW group and 53.1% in CONTROL group.
The probability of a quadriceps strength assessment during rehabilitation was associated with longer physiotherapy duration and the NEW model of care (Table 6). Those with higher BMI were less likely to undergo hamstring assessment, as were females. Attending more sessions was positively associated with the probability of hamstring assessment (Table 6). The probability of a patient completing rehabilitation to discharge was significantly associated with a longer duration of physiotherapy, an increased number of attended sessions, and the CONTROL model of care (Table 6).
Our results suggest that a phase-based progressive rehabilitation program leads to increased utilisation of a number of objective measures by treating physiotherapists. A phase-based model also appears to influence certain service metrics, resulting in a longer duration of physiotherapy rehabilitation and a higher number of attended physiotherapy sessions. It does not appear to increase rehabilitation completion rates, or rates of return to sport and activity. Following the introduction of a phase-based model of care, the incidence of physiotherapists using objective outcome measures significantly increased for assessment of quadriceps and kinetic chain strength or endurance (including calf, glute or trunk), and neuromuscular control with single leg squat performance. This finding suggests that following the NEW model of care, physiotherapists were more frequently performing more comprehensive objective assessment to guide rehabilitation. The importance of monitoring and increasing lower limb muscle strength, particularly quadriceps, in rehabilitation post ACLR is well accepted within current literature [2, 22,23,24].
There is currently no ideal duration or dose of physiotherapy identified in the literature [2, 7, 17, 18]. In this study, ‘completion’ of physiotherapy indicated that the treating physiotherapist discharged the patient from the service. This would generally indicate that the patient is meeting certain physical outcomes (such as range of motion, strength and functional measurements) and has been given return to activity or sport advice. In comparison, being discharged due to failing to attend could occur at any time point post-surgery, and therefore at varied stages of rehabilitation. This study showed that attending physiotherapy for a longer duration was significantly associated with higher rehabilitation ‘completion’ rates. Interestingly, patients in the CONTROL group were more likely to complete rehabilitation compared to the NEW group. A potential explanation may be that prior to the new model of care there was less guidance around expectations of physical capacity and performance prior to discharge and/or recommendations of return to sport. Prior to the new model there was a reliance on the individual clinicians’ judgement and experience to make decisions regarding discharge and return to sport. This may have led to premature discharge and return to activity. In comparison, a phase-based model where clinicians are utilising objective outcomes to guide decision making may result in lower rates of discharge by the physiotherapist due to patients not achieving recommended criteria.
Follow-up phone calls investigated reasons why patients may fail to attend appointments, and subsequently be discharged from the service. Two of the most common reasons identified were ‘Thought they were discharged’ and ‘happy with knee’. Both these reasons indicate a potential disconnect between patient and physiotherapist expectations. In some cases, physiotherapists may be striving to achieve rehabilitation goals based on existing literature in sporting populations; however, not all public system ACLR patients may share these goals. The public hospital ACLR cohort includes a number of patients who participate in social sports but do not perform regular strength and conditioning exercise. This can make it difficult to engage patients to perform regular resistance exercise to achieve adequate strength gains recommended in ACLR rehabilitation . This can also introduce difficulty in establishing clear functional goals and may result in low motivation to participate in extensive rehabilitation. High levels of motivation have been shown to be associated with returning to pre-injury activity levels  and motivation may contribute to some ceasing rehabilitation sooner, and therefore not ‘completing’ physiotherapy. This can also present challenges for physiotherapists in providing well-informed return to sport advice to patients when impairments and physical performance deficits persist.
Regardless of the model of care, poor attendance rates, low rehabilitation completion rates and reduced functional outcomes were observed. This finding is somewhat surprising as it was hypothesised that a clear rehabilitation pathway guided by objective outcome measures would have increased patient’s functional outcomes and subsequently completion rates. While beyond the aim of this study, evaluating the relationship between quantitative objective data throughout the rehabilitation process with the patient’s level of function on discharge and follow-up could provide additional insight into the impact of criteria-based rehabilitation. These findings also highlight the importance of both patient selection for surgery, and the need for standardised education from all clinicians (surgeons and physiotherapists) regarding the intense rehabilitation requirements post ACLR. Heightening patients’ expectations may contribute to increased motivation and improved attendance . Given the literature reports satisfactory function can be achieved with conservative management [26, 27], it is important this option is explored in those patients who may not have a desire to return to sport. The low rehabilitation completion rates seen in both groups may also be indicative of a lack of patient engagement in ACLR rehabilitation programs. Exploring patient factors that contribute to rehabilitation adherence and engagement would empower public services to develop potential strategies to address this issue.
Although this study has provided new information regarding the implications of new models of care in an ACL rehabilitation setting, its limitations should also be recognised. The retrospective, observational design precludes the determination of causal relationships between our findings and the model of care change. Additionally, some participants engaged in rehabilitation across both models due to the use of a specific cut-off date in group allocation. It should also be recognised that data collection was not blinded, and the researcher was involved in the service development and data collection. Data were captured from clinical notes that were not specifically documented for research purposes, and documentation was occasionally unclear and required interpretation, contributing to potential misclassification bias. When collecting data pertaining to physiotherapist use of outcome measures, if a physiotherapist had assessed that outcome measure at least once in their rehabilitation it was considered compliant, potentially leading to an over-representation of outcome measure use. A low response rate to the phone call follow-ups also made it difficult to extrapolate statistical relationships between the model of care change and return to sport or activity rates. Lastly, this study collected data on physiotherapy utilisation of outcome measures, however it did not report on specific clinical patient outcomes. A prospective study investigating whether rehabilitation attendance and duration in a public hospital setting impacts the achievement of certain evidence-based outcomes (e.g. muscle strength, hop tests) would help inform ALCR rehabilitation models of care.
This study determined that in patients electing to undergo supervised rehabilitation in a physiotherapy department in a public hospital, a new model of care incorporating a phase-based rehabilitation program achieved the following; an increase in physiotherapist utilisation of objective physical measures, namely, quadriceps strength, kinetic chain muscle strength, and single leg squat performance; an increased total duration of rehabilitation; and an increased total number of physiotherapy sessions attended. Despite this, rehabilitation completion rates decreased with the new model of care. Further work is required to understand the relationships between rehabilitation models of care and key patient metrics, particularly functional outcome.
Availability of data and materials
The data that support the findings of this study are available on request from the corresponding author. The data are not publicly available due to them containing information that could compromise research participant privacy.
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The authors wish to acknowledge the contribution of Loren Barton, for her assistance with chart review and the introduction of the new model of care into the department.
This work was funded by the QEII Orthopaedic Research Fund.
Ethics approval and consent to participate
Ethical approval was granted by the Metro South human research ethics committee (HREC/16/QPAH/732).
Consent for publication
All authors have completed the ICMJE uniform disclosure form at www.icmje.org/coi_disclosure.pdf and declare: ME and CS report payment from QEII Orthopaedics to EBM Analytics for assistance with completion of this study, and shares in EBM Analytics. No other authors have competing interests to declare.
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Additional file 1:
Phases, Outcome Measures and Discharge Criteria.
Additional file 2:
Clinical practice: models of care.
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Tuckerman, K., Potts, W., Ebrahimi, M. et al. Evolution of service metrics and utilisation of objective discharge criteria in anterior cruciate ligament reconstruction rehabilitation: a retrospective cohort study with historical control in a public hospital physiotherapy department. Arch Physiother 10, 23 (2020). https://doi.org/10.1186/s40945-020-00093-9
- Model of care
- Supervised rehabilitation