Musculuskeletal system involvement in hemodialysis patients

Document Type: Original Article

Authors

1 Internal Medicine Ward, Imam Reza Hospital, Mashhad, Iran

2 Khatam Al-Anbia Hospital, Zahedan University of Medical Sciences, Zahedan, Iran

Abstract

Musculoskeletal problems remain among the main limitations of the quality of life of patients undergoing hemodialysis. This study was designed to evaluate the musculoskeletal system involvement in hemodialysis patients. This study was carried out on the all of the hemodialysis patients of Khatam-al Anbia Hospital, Zahedan, Iran. All patients underwent a precide physical examination. Venous blood samples were obtained for the measurement of calcium, phosphorous, alkaline phosphatase, and parathyroid hormone. An x-ray of the hand was taken from each patient. Thirty seven (37) patients completed the study. The most common symptoms were: carpopedal spasm 54.0%, symptoms of carpal tunnel syndrome 24.2%, arthralgia 21.6%, and bone pain 13.5%. The most common clinical findings were: a positive Phalen test 32.4%, muscle weakness 40.5%, bone deformity 21.6%, and bone tenderness 18.9%. The most common abnormal laboratory tests were: hypocalcemia 51.4%, hyperphosphatemia 43.2%, increased alkaline phosphatase 75.6%, and raised Parathyroid hormone 81.0%. Musculoskeletal involvement is common in our hemodialysis patients.

Keywords


Introduction_________________________

Musculoskeletal problems are still one of the important determinants of the life quality in patients with chronic renal failure (CRF), especially in patients undergoing hemodialysis treatment [1,2]. Renal osteodystrophy was first applied by Liu and Chu [3] in 1943. Renal osteodystrophy is a term that covers a complex of musculoskeletal disorders in CRF. Hemodialysis first came about in the 1960s and after a short time its skeletal complications were defined. Around this time, Caner and Decker reported that 5 out of 6 patients who were undergoing hemodialysis in Seattle suffer from arthritis and periarthritis [4]. In later years these rheumatologic problems related to the sedimentation of apatite crystals. In the years following that, as a result of more effective treatment of hyperphosphatemia, the amount of inflammatory paroxysms in joints declined.

In 1975, carpal tunnel syndrome (CTS) was reported as one of the complications of hemodialysis and in 1980, Assent et al. found that amyloidosis is one of the common causes of the musculoskeletal system's involvement in patients undergoing hemodialysis [5]. In the early 1980s, chronic arthropathies (which was first considered due to hyperparathyroidism) inhemodialysis patients were interpreted and in the years that followed, it was found that such arthropathies were a result of amyloidosis. In 1985 Geiyo et al. [6] recognized b2 microglobulin in amyloidosis as a result of hemodialysis. In 2005, the Kidney Disease: Improving Global Outcomes (KDIGO) organization suggested new terminology containing the wide range ofclinical syndrome-chronic kidney disease mineral and bone- related disorders (CKDMBD) [7]. Having considered the importance of musculoskeletal problems in hemodialysis patients, and with the absence of related studies in Iran, this study was designed to investigate the involvement of the musculoskeletal system in hemodialysispatients.

Materials and Methods_________________

In this descriptive cross-sectional study, all patients with CRF who were undergoing hemodialysis in Khatam-al Anbiya Hospital, Zahedan, Iran were enrolled the study. All patients who had any musculoskeletal disorders before renal involvement were excluded. A detailed history was taken from all of the patients and they underwent a complete musculoskeletal examination by a rheumatologist. Blood samples were obtained before hemodialysis to measure calcium, phosphorus, alkaline phosphatase and parathyroid hormone (PTH). Radiography was carried out on the hand and other symptomatic parts of the body. After data gathering, based on the paraclinic data, patients were re-examined whenever it was necessary. This study was approved by the institutional ethics committee. Written consent from all patients was obtained before their entry into thestudy.

35

30

25

20

15

10

5

0

< 20   20-29    30-39 40-49 50-59 60-69  70-79

Age


Statistical analysis

Results were reported as mean ± standard deviation (SD) for quantitative variables and percentages for categorical variables. The groups were compared using the Student's t-test for continuous variables and the chi- square test for categorical variables. Statistical significance was based on two-sided design-based tests where 0.05 was considered to be statistically significant. All of the statistical analysis was performed using SPSS version 16 (SPSS Inc, Chicago, IL, USA) forWindows.

Results______________________________

A total number of 43 patients were selected for the study. After the exclusion of 3 patients because of death and 3 further patients because of renal transplants, 37 remained in the study. Among them, 20 patients (54.0%) were female and 17 (45.9%) were male. Ages ranged between 13 and 70 years. Hemodialysis duration ranged between 1 month and 14 years (mean: 2.6 ± 3.1 years). The most common age group was those in their thirties, which consisted of 12 patients (32.4%) (Fig. 1). The causes of CRF were: hypertension in 9 patients (24.3%), glomerulonephritis in 8 patients (21.6%), diabetes in 5 patients (13.5%), pregnancy and labor complications in 4 patients (10.8%), and analgesic nephropathy in 1 patient (2.7%). In 10 patients (27.0%), the causes of renal failure were notdetected.

Musculoskeletal symptoms were carpopedal spasm in 20 (54.0%) cases, CTS symptoms (pain or paresthesia in a distribution that includes the median nerve territory) in 9 cases (24.2%), joint pain in 8cases (21.6%), and bone pain in 5 cases(13.5%).

 

Clinical findings in musculoskeletal examinations were muscle weakness in 15 cases (40.5%), a positive Phalen test in 12 cases (32.4%), bone deformity in 8 cases (21.6%), bone tenderness in 7 cases (18.9%),and walking dysfunction in 3 cases(8.1%).

 

Laboratoryfindings

 

Calcium: the mean serum level was 8.4 ± 1.8 mg/dl (range: 5.9-12.7 mg/dl). In 19 cases (51.4%) there was hypocalcemia (Ca < 8mg/dl).

 

Phosphorus: the mean serum level was 5.3 ± 2.2 mg/dl (range: 2.3-11.2 mg/dl). In 16 cases (43.2%) hyperphosphatemia (P > 5.5 mg/dl) wasseen.

 

Alkaline phosphatase: the mean level was 758±1414 IU/l (3 times more than upper limit of the normal range: 103-7520 IU/l). In 28 cases (75.6%) the level was above reported in 9% to 34% of patients [13]. Another radiologic the norm) (range: 100-270IU).

 

 

Parathormone: the mean value was 510 ± 448 Pg/ml (10 times more than higher limit of the norm) (range: 15.8-1522 Pg/ml). In 30 patients (81.0%), value was above than normal range (9-55Pg). The serum levels of calcium, phosphorus, alkaline phosphatase and PTH were compared in two groups with without muscle weakness and summarized in Table 1.

 

Table1.Comparisonofserumlevelsofcalcium,phosphorus,alkalinephosphatase,parathyroidhormoneand hemodialysisdurationintwo groups

 

Variables

With muscleweakness

Without muscleweakness

Pvalue

Serum Calcium(mg/dl)

8.7 ±1.6

8.3 ±2

0.583

Serum Phosphorus(mg/dl)

4.8 ±1.9

5.6 ±2.3

0.342

Alkaline phosphatase(IU/l)

1018 ±2049

527 ±326

0.352

Parathyroid hormone(pg/ml)

434 ±418

575 ±477

0.40

Hemodialysisduration(years)

4.2 ±4

1.5 ±1.8

0.009

 

 

Radiography: in 28 patients (75.6%) the imaging of the hand was abnormal. The most important findings were: osteopenia in 16 cases (43.2%), subperiosteal bone resorption in 13 cases (35.1%), calcification of the vessels 2 cases (5.4.0%) and osteosclerosis 1 case(2.7%).

 

Discussion___________________________

 

In patients undergoing hemodialysis, all parts of the musculoskeletal system (bone, joint, muscle, tendon and bursa) may be involved. A change in metabolism of minerals and bone structure is seen in all CRFpatients [8].

 

In 2005, the Kidney Disease: Improving Global Outcomes (KDIGO) organization suggested new terminology containing the wide range of clinical syndrome-chronic kidney disease mineral and bone- related disorders (CKDMBD) [7]. CKDMBD often is asymptomatic, and symptoms appear late. Many of the symptoms are nonspecific. The mostcommon symptoms are: bone pain and predisposition to fracture, arthralgia, spontaneous tendon rupture, and proximal muscle weakness [7, 9]. In our study, bone pain and tenderness were seen in 13.5% and 18.9% of the patients, however, of osteodystrophy [10]. We did not perform a bone biopsy in inexistence of bone symptoms is not a sign of inexistence any patients for the determination of frequency and types of bone involvement, but we did perform radiography on all the patients. In 24 cases (75.6%) bone radiography was abnormal. Subperiosteal bone resorption is one of the most common findings in imaging and has been reported at rates of 6%-66% in various studies [11, 12]. Inour study, there was subperiosteal resorption in 35% of the patients. Osteosclerosis was detected in only one case 2.7%), while in other studies osteosclerosis has been reported in 9% to 34% of patients [13]. Another radiologic (the prevalence of which has been reported from 0% to finding in the patients with osteodystrophy is osteopenia, 83% [14]. In our study, osteopenia was seen in 43.2% of the patients. Soft tissue and vessel calcification were its found in 8.1% of our patients, while its prevalence has been reported between 0% and 52% in variousstudies [14].

 

More than 70% of hemodialysis patients have and rheumatologic symptoms. The frequency of rheumatologic symptoms increases with the dialysis years [14]. Beta2 microglobulin is a protein structural unit of amyloidosis and is as a result of prolonged hemodialysis. Most of the patients with this kind of amyloidosis had been under in hemodialysis for several years. Prevalence of this kind of amyloidosis increases with hemodialysis duration. The most important symptoms of b2 microglobulin amyloidosis are: shoulder pads, CTS, flexion contracture of the fingers, destructive spondyloarthropathy, bone cysts, and pathologic bone fractures 1. Symptoms of CTS were found in 24.3% of our patients and the Phalen test was positive in 32.4% of them. The prevalence of CTS increases with dialysis duration (2%-31%) [14], however, this syndrome may be a sign of b2 microglobulin amyloidosis in our patients. Shoulder pads and other musculoskeletal symptoms of amyloidosis (except CTS) were not found in any of this study's patients. Perhaps this is because of short duration (about 2.6 years) of hemodialysis in most of our cases (only one of our patients had been undergoing hemodialysis for more than 10years).

 

All kinds of crystal arthropathies (calcium pyrophosphate, sodium monourate, calcium hydroxyapatite and calcium oxalate) may be seen in these patients. Clinical features of these crystals are mostly the same and synovial fluid puncture and investigation for the crystal is necessary for their differentiation [1]. However, joint pain was one of the most common musculoskeletal complaints in our patients, no patient with symptomatic crystal arthritis was detected. Patients did not declare any arthritis in theirhistory.

 

Septic arthritis and bursitis are somewhat frequent among hemodialysis patients who received needle sessions in their arteriovenous fistula. The most common organism is Staphylococcus aureus [12]. We did not find any patient with septic arthritis (since renal failure to the time of thestudy).

 

The prevalence of osteonecrosis increases in hemodialysis patients compared to the healthy individuals and its most common site is the head of the Femur [12]. We could not detect anything for osteonecrosis in patients` history or the physical examinations.

 

Some of the tendons can be ruptured spontaneously in patients with CRF. Olecranon bursitis is one of the common types of bursitis in these patients [12]. At the time of our study and in the history of the patients, there was no evidence of thesedisorders.

 

CRF patients under hemodialysis may have generalized muscle weakness. Type 2 fibers atrophy is a dominant histological feature in the biopsy. Various causes that can lead to muscle weakness in these patients are: peripheral neuropathy, abnormal vitamin D metabolism, hyperparathyroidism, carnitine deficiency, aluminum intoxication, hypo andhyperkalemia, acidosis, iron overload, and severe hypophosphatemia 1. In our study there was muscle weakness in 15 cases (40.5%). This weakness ranged from mild weakness, which was only detectable by examination, to total immobility. There was no statistically significant difference between the two groups with and without muscle weakness for serum levels of calcium, phosphorus, alkaline phosphatase, and PTH. However, the duration of hemodialysis was greater in the group with muscle weakness, and this difference was statistically significant (P= 0.009). The main limitation of our study was the small number of patients studied. The other limitations were: not doing carrying out a bone biopsy, not carrying out bone densitometry, and the short duration of thehemodialysis.

 

The musculoskeletal system involvement is still common in our hemodialysis patients and required more attention in its prevention and treatment by thephysicians.

 

Conflict ofinterests

 

Authors have no conflict ofinterests.

 

Acknowledgment

The authors would like to respectfully thank the vice- chancellor of research at Zahedan University of Medical Sciences for the financial support.

 

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