Incomplete Evidence of Bone Density Normalization Following Long-Term Reproductive Hormone Treatment in Men With Hypogonadotropic Hypogonadism.

Men with hypogonadotropic hypogonadism had significantly lower lumbar spine BMD compared to healthy controls.

• Meta-analysis of 5 studies found lower lumbar spine BMD in men with HH vs healthy controls (SMD -5.98; 95% CI: -11.5 to -0.47).
• Total sample of 24 studies with data specific to men with HH included n = 625 participants.
• Both lumbar spine and femoral neck BMD were found to be low in men with HH.

Men with congenital hypogonadotropic hypogonadism (CHH) may have persistently low BMD despite prolonged hormonal treatment.

• Incomplete BMD normalization was identified as common despite long-term reproductive hormone treatment, particularly in CHH.
• Meta-regression assessed relationships between treatment duration and BMD Z-scores against normative population data.
• 33 eligible studies were identified, of which 24 included data specific to men with HH.

Higher BMD in men with HH was associated with several clinical and biochemical factors.

• Higher BMD was associated with younger age at treatment initiation.
• Higher BMD was associated with partial HH (as opposed to complete HH).
• Higher serum testosterone and estradiol concentrations were associated with higher BMD.

Fracture prevalence was high in studies that systematically investigated fractures as an outcome, but fractures were seldom reported in other studies.

• The paper notes that fracture prevalence was high 'in the few studies systematically studying fractures as an outcome.'
• In studies not specifically designed to examine fractures, fractures were seldom reported, suggesting underreporting.
• This finding highlights a gap in the systematic documentation of fracture outcomes in men with HH.

Reproductive hormone treatment improved lumbar spine and femoral neck BMD in men with hypogonadotropic hypogonadism.

• BMD at both the lumbar spine and femoral neck improved with hormonal treatment.
• Despite improvement, complete normalization of BMD was often not achieved, suggesting treatment is beneficial but insufficient in many cases.
• The study was a systematic review and meta-analysis of 33 eligible observational studies.

The prevalence and severity of low BMD and treatment effects in HH had not previously been investigated in large multicenter studies.

• The authors conducted a systematic review and meta-analysis of 'several small, observational studies.'
• Databases searched included OVID Medline, Embase, CINAHL, SCOPUS, Web of Science, and Cochrane Library.
• Study selection and data extraction were performed using COVIDENCE and a prespecified tool.
• Results were summarized using descriptive statistics and meta-analysis with meta-regression.