Hypermobility and Joint Instability: When Flexibility Becomes a Problem

What Is Joint Hypermobility?

Joint hypermobility refers to the capacity of joints to move beyond their normal physiological range. It exists on a spectrum — from asymptomatic generalised hypermobility (a normal variant found in a significant proportion of the population, particularly in women, younger individuals, and those of South Asian and African descent) to hypermobility spectrum disorder (HSD) and the more systemic hypermobile Ehlers-Danlos syndrome (hEDS). The connective tissue of hypermobile individuals contains collagen that is structurally normal in composition but has altered mechanical properties — it is more extensible, less stiff, and provides reduced passive joint restraint. This is why hypermobility has long been associated with both exceptional physical performance (in dance, gymnastics, and yoga) and with disproportionate injury rates and chronic pain. The capacity for large range is both an asset and a liability — entirely dependent on the neuromuscular control available to manage it.

The Hypermobility Spectrum

Asymptomatic hypermobility requires no intervention beyond awareness. Hypermobility spectrum disorder (HSD) describes symptomatic hypermobility — musculoskeletal pain, recurrent joint sprains, joint instability, and fatigue — in the absence of the systemic features that characterise hEDS. Hypermobile Ehlers-Danlos syndrome (hEDS) is diagnosed using the 2017 international criteria and involves the additional features of a positive family history, skin hyperextensibility, atrophic scarring, and systemic manifestations including autonomic dysfunction (POTS — postural orthostatic tachycardia syndrome), gastrointestinal dysmotility, and chronic widespread pain. Both HSD and hEDS are significantly underdiagnosed — particularly in women — and patients frequently spend years with unexplained pain, recurrent injuries, and normal investigations before an accurate diagnosis is reached. The Beighton score (a nine-point assessment of joint range including thumb-to-forearm, little finger hyperextension, elbow and knee hyperextension, and palm-flat-on-floor with knees straight) is the most widely used clinical screening tool.

Why Hypermobility Causes Pain

The mechanisms of pain in hypermobility are multiple and interrelated. Joint microstress: lax passive restraints mean that muscles must work harder and with greater precision to maintain joint centring — a significantly increased neuromuscular demand that produces fatigue, pain, and co-contraction patterns that feel like stiffness despite the underlying laxity. Recurrent microtrauma: joints that translate more under load experience greater contact stresses and more frequent ligamentous strain. Central sensitisation: the chronic nociceptive input from hypermobile joints sensitises the central nervous system over time, producing widespread pain hypersensitivity that extends beyond the directly affected joints. Fatigue — both peripheral muscle fatigue and central cognitive fatigue — is a consistent feature that significantly amplifies pain perception and reduces capacity for the active stabilisation that hypermobile joints depend upon.

Management Principles

Management of symptomatic hypermobility requires a fundamentally different approach to conventional musculoskeletal rehabilitation. The goal is not to increase range — hypermobile individuals have more than enough. The goal is to build neuromuscular control through range: developing the muscular strength, coordination, and endurance to actively stabilise joints throughout their available motion. Proprioceptive training is paramount — the mechanoreceptors in hypermobile ligaments are often dysfunctional, and systematic retraining of joint position sense and balance reduces injury risk substantially. Load management is critical: hypermobile individuals fatigue faster and recover more slowly, requiring more conservative load progression and more attention to rest and recovery. Avoid end-range loading, particularly in multi-joint positions. Aquatic exercise is valuable for building strength and proprioception with reduced joint loading. Patient education — explaining the mechanism of their pain, normalising the condition, and providing a clear rehabilitation framework — is itself therapeutic and significantly reduces pain catastrophising.