Are there really specific risk factors for heterotopic ossifications? A case report of 'non-risk factor' after total hip replacement

Surgical Treatment of Severe Heterotopic Ossification After Total Hip Arthroplasty Over the Last 25 Years: A Systematic Review of the Literature and a New Case Series

BACKGROUND

Severe heterotopic ossification (HO) (grades III and IV) after total hip arthroplasty (THA) over the last 25 years requiring excision is very uncommon. We performed a systematic review of the literature and reported a new case series with operative treatment after primary uncemented THA.

METHODS

A systematic review identified papers describing patients who had excision of HO after THA performed after 1988. Concepts of hip arthroplasty, HO, and surgical excision were searched in MEDLINE, Embase, and Scopus from database inception to November 2022. The inclusion criteria were articles that included specific patient data on the grade of HO, operative procedure, and prophylaxis. Studies were screened for inclusion by 2 independent reviewers. The extracted data included demographic data, the interval from index surgery to excision, clinical results, and complications. There was one surgeon who performed reoperation for ankylosis of primary THA in 3 men who had severe pain and hip deformity.

RESULTS

Data from 7 studies were included. There were 41 patients who had grade III or IV HO who had excision, and in 5 patients, revision of a component was also performed. Perioperative prophylaxis was irradiation alone in 10 patients, irradiation and indomethacin in 10 patients, and indomethacin alone in 21 patients. At a mean follow-up time of 14.8 months, the definition of the results was not uniform, and range of motion was improved, but relief of pain was inconsistent. There was one dislocation after resection without revision, one gastrointestinal complication, and 2 recurrences. Treatment of the 3 new patients, with wide excision of periarticular bone, selective exchange of components, and perioperative irradiation prophylaxis, was successful in improving pain, motion, and deformity.

CONCLUSIONS

There is insufficient good-quality data on the operative treatment of severe symptomatic HO after THA performed over the last 25 years. Prophylaxis with low-dose irradiation prevented a recurrence. Multicenter studies are needed to determine the optimum timing and prognosis for treatment.

A Study on the Effect of Precise Rehabilitation Therapy Guided by Three-dimensional-computed Tomography Reconstruction Technology in Hip Fracture Surgery Patients

OBJECTIVE

To evaluate the effectiveness of precise rehabilitation therapy guided by three-dimensional computed tomography (3D-CT) reconstruction technology in hip fracture patients through a retrospective cohort study.

METHOD

Data were retrospectively collected from 60 patients aged over 60 who had undergone hip fracture surgery. They were divided into two groups based on their chosen rehabilitation method: a control group and a test group. The study collected demographic data, fracture characteristics, and quality of life indicators to assess the impact of rehabilitation on economic indicators and daily living activities (ADL). Additionally, it included assessments of muscle strength, joint mobility, hip function, postoperative complications, and records of hospitalization information and costs. Cognitive function was also assessed postoperatively.

RESULTS

There were no significant differences in demographic data, fracture characteristics, ADL, or Fugl-Meyer assessment (FMA) between the two groups. However, the test group exhibited significantly higher post-surgery muscle strength recovery and hip mobility compared to the control group (P<0.05). Additionally, the test group had significantly fewer hospitalization days and lower hospitalization costs than the control group (P<0.05).

CONCLUSION

Precise rehabilitation therapy guided by 3D-CT reconstruction technology for hip fracture surgery patients can enhance early muscle strength recovery, improve mobility of the affected limb, reduce hospitalization duration and costs, and enhance overall patient recovery outcomes.

Coding and noncoding RNA profile of human heterotopic ossifications - Risk factors and biomarkers

Heterotopic ossification (HO) means the formation of bone in muscles and soft tissues, such as ligaments or tendons. HO could have a genetic history or develop after a traumatic event, as a result of muscle injury, fractures, burns, surgery, or neurological disorders. Many lines of evidence suggest that the formation of HO is related to the pathological differentiation of stem or progenitor cells present within soft tissues or mobilized from the bone marrow. The cells responsible for the initiation and progression of HO are generally called HO precursor cells. The exact mechanisms behind the development of HO are not fully understood. However, several factors have been identified as potential contributors. For example, local tissue injury and inflammation disturb soft tissue homeostasis. Inflammatory cells release growth factors and cytokines that promote osteogenic or chondrogenic differentiation of HO precursor cells. The bone morphogenetic protein (BMP) is one of the main factors involved in the development of HO. In this study, next-generation sequencing (NGS) and RT-qPCR were performed to analyze the differences in mRNA, miRNA, and lncRNA expression profiles between muscles, control bone samples, and HO samples coming from patients who underwent total hip replacement (THR). As a result, crucial changes in the level of gene expression between HO and healthy tissues were identified. The bioinformatic analysis allowed to describe the processes most severely impacted, as well as genes which level differed the most significantly between HO and control samples. Our analysis showed that the level of transcripts involved in leukocyte migration, differentiation, and activation, as well as markers of chronic inflammatory diseases, that is, miR-148, increased in HO, as compared to muscle. Furthermore, the levels of miR-195 and miR-143, which are involved in angiogenesis, were up-regulated in HO, as compared to bone. Thus, we suggested that inflammation and angiogenesis play an important role in HO formation. Importantly, we noticed that HO is characterized by a higher level of TLR3 expression, compared to muscle and bone. Thus, we suggest that infection may also be a risk factor in HO development. Furthermore, an increased level of transcripts coding proteins involved in osteogenesis and signaling pathways, such as ALPL, SP7, BGLAP, BMP8A, BMP8B, SMPD3 was noticed in HO, as compared to muscles. Interestingly, miR-99b, miR-146, miR-204, and LINC00320 were up-regulated in HO, comparing to muscles and bone. Therefore, we suggested that these molecules could be important biomarkers of HO formation and a potential target for therapies.