Correlation Between Walking Ability and Monthly Care Costs in Elderly Patients After Surgical Treatments for Hip Fractures.

OBJECTIVE: To validate the relationship between residual walking ability and monthly care cost as well as long-term care insurance (LTCI) certification level in elderly patients after surgical treatment for hip fractures in Japan.
METHODS: Elderly patients aged >75 years who underwent surgical treatment for hip fractures in our hospital were included. The preand post-surgical (6-month) walking ability and LTCI certification and the presence or absence of dementia was determined from medical records and questionnaires. Walking ability was classified into 6 levels used in our daily medical practice. Based on these data, we correlated the relationship between walking ability and the LTCI certification level. Further, based on the official statistics pertaining to the average monthly costs per person at each LTCI certification level, we evaluated the relationship between walking ability and monthly care cost.
RESULTS: A total of 105 cases (mean age, 80.2 years; 16 men; 39 patients with dementia) were included. The correlation between walking ability and average monthly cost per person as well as LTCI certification level at 6 months postoperatively (r=0.58) was demonstrated. The correlation was found in both groups with and without dementia.
CONCLUSION: The ability to walk reduced the cost of care in elderly patients who experienced hip fracture, regardless of the presence of dementia.

INTRODUCTION

The general budget of Japan for the 2012 fiscal year was approximately ¥90 trillion. The annual sum allotted to the long-term care insurance (LTCI) system established in 2000 steadily increased to ¥8.9 trillion in the 2012 fiscal year, and is difficult to sustain [1]. The Nursing Care Needs Certification board, which consists of physicians, nurses, and other experts, determines the certification levels of LTCI, to comply with the needs of elderly persons aspiring to receive benefits [2]. The certification levels are stamped ‘support levels 1 and 2’ and ‘care levels 1 to 5’. Support levels are milder than care levels and a lower number indicates milder levels. The higher the certified care level, the higher the average cost of care per patient in Japan’s LTCI system [3]. Therefore, lowering the long-term care needs is an urgent goal to reduce LTCI costs.

Orthopedic surgeons and therapists endeavor to recover and maintain their patients’ ability to walk. Nearly 94% of all elderly patients with hip fractures in Japan are treated surgically despite the high costs associated with surgery and the risks of co-morbidity [4,5]. In contrast, the LTCI certification level is not based on walking ability but on the number of labor hours required by the patient. For example, patients who require a wheelchair to move but can independently perform daily activities are regarded as mild cases. Conversely, patients with dementia who walk freely following surgical treatment are considered high-ticket recipients in the LTCI system. Therefore, a contrasting perspective of the LTCI system and the orthopedic surgeons exists with respect to patient needs. The former focuses on the estimated hours of care required by the patient, whereas the latter considers the recovery of musculoskeletal function, i.e., walking ability, as the main goal [2]. It is annoying that the LTCI system disregards walking ability compared with coexisting dementia during certification. Thus, we considered whether surgical orthopedic intervention reduces LTCI costs. Kim et al. [6] reported that motor impairment correlated with the service time provided to assist with activities of daily living (ADLs) in the LTCI system of Korea. However, few reports have investigated the correlation between walking ability and LTCI certification level in Japan’s clinical setting. Thus, we investigated the relationship between residual walking ability and monthly costs per person at each LTCI certification level among patients with and without dementia in our medical district in Japan.

Another concern is that interventions in injured patients with dementia might not play a useful role in gait recovery because, dementia per se leads to ADL impairment [7,8]. Therefore, we compared the altered levels of walking ability from pre-injury stage to 6 months postinjury between patients with and without dementia.

MATERIALS AND METHODS

The present study protocol was reviewed and approved by the Ethics Committee of JCHO Funabashi Central Hospital (No. H28-7). Written informed consent was obtained from each patient. Elderly patients (>75 years) who underwent surgery for hip fractures in our hospital from October 2011 to September 2013 were included. Pre-injury and postoperative (6-month) data related to walking ability and LTCI certification level were collected. Walking ability was classified into 6 levels used in daily medical practice: level 1, can walk freely (Free); level 2, can walk with a cane (Cane); level 3, can walk with a walker (Walker); level 4, can walk along a grab bar (Bar); level 5, can ambulate using a wheelchair (Wheel); and level 6, unable to walk and/or bedridden (Bed). Further, all patients were divided into the 8 LTCI certifi cation levels formulated by the Ministry of Health, Labour and Welfare of Japan (in ascending order starting from mild cases): NA, not applicable; SL1 and SL2, support levels 1 and 2, respectively; CL1, CL2, CL3, CL4, and CL5, care levels 1 to 5, respectively. Data were gathered from the hospital medical records and the follow-up clinical questionnaires. Patients who failed to return for follow-up were contacted by phone or via their nursing care managers to the best possible extent. Injured elderly patients who were characterized with disquiet mood, turbulent behavior, memory loss, difficulties with thinking, or history of dementia were defined as patients with dementia. Furthermore, surgical expenses including material costs were surveyed from the account ledgers of the hospital.

Based on these data, we investigated the changes in levels of walking ability from pre-injury to 6 months after surgery, correlation between levels of walking ability and LTCI certification at 6 months postoperatively, and correlation between levels of walking ability and the average monthly cost of care per person at each LTCI certification level. Additionally, we compared these points between patients with dementia (dementia group) and without dementia (non-dementia group). Mann-Whitney U test, Wilcoxon signed-rank test, and Spearman correlation coefficient by rank test were used for statistical analysis (p<0.05 indicated significance).

Regarding insurance costs LTCI supplied to in-home care cases, the Ministry of Health, Labour and Welfare reported that the average monthly cost per person at each LTCI certification level was as follows: SL1 (¥22,842), SL2 (¥41,802), CL1 (¥73,628), CL2 (¥102,118), CL3 (¥154,020), CL4 (¥187,684), CL5 (¥230,062) [3]. Based on these values, we evaluated the correlation between care costs and levels of walking ability following surgery for hip fractures in our elderly cohort.

RESULTS

A total of 138 patients aged >75 years experienced hip fractures and underwent surgical treatment in our hospital during the selected 2-year period. Eight patients who died during the study period—1 died on postoperative day 6 due to sepsis and 7 who died of internal disease (3 cases of pneumonitis and 1 case each of bladder cancer, thrombosis of the superior mesenteric artery, hematological disease, and decrepitude) after discharge—were excluded. Another 25 cases were lost to follow-up, and were also excluded. Finally, we obtained valid data pertaining to 105 cases. In this cohort, 48 patients with femoral neck fractures were included, including 11 who underwent internal fixation and 37 who were treated with hemiarthroplasty (Table 1). Fifty-five patients sustained intertrochanteric fractures, and 52 of them underwent internal fixation and 3 were treated with hemiarthroplasty. Two patients with sub-trochanteric fractures underwent internal fixation. The mean age was 80.2 years (range, 75–102 years), and 16 patients were male. Thirty-nine patients experienced dementia as a complication (dementia group) and 66 did not manifest dementia (non-dementia group). All cases underwent physical therapy starting on admission or on the next day. The wait time from injury to surgery was 4.35±2.22 days, which was not significantly different between the dementia and non-dementia groups (3.92±2.25 and 4.56±2.13 days, respectively). The mean operating cost (including material costs) was ¥696,000.

Table 1.

Patients’ demographics (n=105)

Characteristic	Dementia cases (n=39)	Non-dementia cases (n=66)	p-value
Age (yr)	87.7±5.34	83.1±5.77	<0.01[*]
Sex (male:female)	6:33	15:51	NS
Diagnosis
Femoral neck fracture	15 (38.5)	33 (50.0)
Inter-trochanteric fracture	23 (58.9)	32 (48.5)
Sub-trochanteric fracture	1 (2.6)	1 (1.5)
Treatment
ORIF	28 (71.8)	37 (56.1)
ORIF (femoral neck fracture)	6 (15.4)	5 (7.6)	NS
Hemiarthroplasty	11 (28.2)	29 (43.9)
Waiting time (day)	3.92±2.26	4.56±2.13	NS

Values are presented as mean±standard deviation or number (%).

NS, no significant difference; ORIF, open reduction internal fixation.

p<0.05 was considered statistically significant.

Walking ability

In the entire cohort, the walking ability of patients before injury was as follows: level 1 (Free), 65; level 2 (Cane), 14; level 3 (Walker), 8; level 4 (Bar), 14; level 5 (Wheelchair), 2; level 6 (Bed), 2 patients. Six months postoperatively, the patients’ walking ability was as follows: 31, 26, 10, 17, 15, and 6, respectively. As a whole, walking ability at 6 months postoperatively was significantly worse compared with pre-injury level (1.86±1.30 and 2.78±1.62, respectively; p<0.05). The average walking ability before injury and at 6 months postoperatively was 2.46±1.54 and 3.49±1.62, respectively, in the dementia group and 1.50±1.00 a nd 2.36±1.49, respectively, in the non-dementia group. The walking ability (pre-injury and 6 months post-injury) of patients with dementia was significantly lower than in patients without dementia (p<0.05). Although both dementia and non-dementia groups showed a significant decrease in walking ability during 6 months (decreased by 1.03±1.25 and 0.86±1.39 levels, respectively, p<0.05), the degree of change was not significant between the two groups (Fig. 1).

Fig. 1.

Dot diagram showing the change in walking ability. Walking ability was classified as follows: ability to walk freely (Free), ability to walk with a cane (Cane), ability to walk with a walker (Walker), ability to walk along a bar (Bar), ability to ambulate using a wheelchair (Wheel), inability to walk and/or bedridden (Bed). NS, no significant difference; POM, months postoperatively. *p<0.05.

LTCI certification level at 6 months postoperatively

The LTCI certification levels at 6 months postoperatively were as follows: NA, 19; SL1, 8; SL2, 8; CL1, 15; CL2, 20; CL3, 19; CL4, 11; CL5, 5, with SL2, 2; CL1, 3; CL2, 9; CL3, 16; CL4, 4; CL5, 5; SL1, 0; NA, 0 in the dementia group and NA, 19; SL1, 8; SL2, 6; CL1, 12; CL2, 11; CL3, 3; CL4, 7; CL5, 0 in the non-dementia group. The LTCI certification levels of patients in the dementia group were significantly higher than those of patients in the non-dementia group (p<0.05).

Relationship between walking ability and LTCI certification level at 6 months postoperatively

A significant correlation existed between the levels of walking ability and certified levels in the LTCI system at 6 months postoperatively (r=0.58), with the regression curve at Y=0.75X+2.2 (Fig. 2). Additionally, we detected a significant correlation between walking ability and LTCI certification levels (r=0.37 and r=0.61, respectively) in both dementia and non-dementia groups.

Fig. 2.

Correlation between walking ability and insurance certification level. NA, not applicable; SL1 and SL2, support levels 1 and 2, respectively; CL1, CL2, CL3, CL4, and CL5, care levels 1 to 5, respectively.

Relationship between walking ability and the average monthly cost of care at 6 months postoperatively

Based on the official statistics pertaining to the average monthly cost at each LTCI certification level, a significant correlation existed between walking ability and the average monthly cost of care per patient at 6 months postoperatively (r=0.58), with the regression curve at Y=2.42×104X+2.70×104 (Fig. 3).

Fig. 3.

Correlation between walking ability and average monthly care costs. The black straight line represents the regression curve.

DISCUSSION

The results of this study showed that the walking ability of patients in the dementia group was inferior both before injury and at 6 months postoperatively and their LTCI levels at 6 months postoperatively were more severe compared with those of patients in the non-dementia group. These results reflect our experience in daily practice. However, no significant difference existed between these two groups about the variation of degree during 6 months, implying that surgical treatment of elderly patients with dementia resulted in similar effects compared with non-dementia cases. Notably, walking ability correlated with LTCI certification levels at 6 months after surgery regardless of the presence of dementia. Additionally, we found a significant correlation between walking ability and average monthly care costs at 6 months postoperatively (regression curve, Y=2.42×104X+2.70×104) (Fig. 3). A single-level improvement in walking ability indicated a ¥24,000 reduction in LTCI expenses per patient per month. Considering that average surgical cost is ¥695,000, if surgical treatment resulted in a level 1 improvement in walking ability, the cost was offset within 29 months of surgery (¥24,000×29 months=¥696,000); however, the study lacked a control group. Previous studies reported that the survival rates of hip fracture at 2 and 3 years postoperatively in Japan were 67%–76% and 63%–69.3%, respectively [9-11]. With favorable long-term survival prospects, the reduction in monthly care costs is very important.

This study has several limitations. First, we did not investigate the hospitalization period or the presence of complications aside from dementia. Second, despite the uncommon use of the 6-level classification of walking ability, we used it in the present study to correlate the degree of recovery of motor function with LTCI certification. However, we believe that this study provides valuable information correlating walking ability with long-term care costs in elderly patients following surgical treatment for hip fractures. Finally, the present study did not show the efficacy of surgical treatment. However, the study confirmed that the inherent ability to walk reduced the cost of care in elderly patients who experienced hip fracture, regardless of the presence of dementia. A comparative cost-benefit analysis of surgical and conservative treatments for elderly patients with hip fractures requires a larger-scale comprehensive study based on a common classification system that includes admission fee and survival rates after injury as well as residual walking ability, certified level of LTCI, and surgical costs as survey items.